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Sample records for svn antibody titers

  1. Low-titer anti-GAD-antibody-positive cerebellar ataxia.

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    Nanri, Kazunori; Niwa, Hisayoshi; Mitoma, Hiroshi; Takei, Asako; Ikeda, Junko; Harada, Toshihide; Okita, Mitsunori; Takeguchi, Masafumi; Taguchi, Takeshi; Mizusawa, Hidehiro

    2013-04-01

    The majority of cases of anti-glutamic acid decarboxylase (GAD)-antibody-positive cerebellar ataxia are reported to have high levels of anti-GAD antibody, and the diagnostic value of low titers of anti-GAD antibody in a patient with cerebellar ataxia is still unknown. The purpose of this study was to verify the characteristics of low-titer-anti-GAD-antibody-positive cerebellar ataxia patients and the diagnostic value of low titers of anti-GAD antibody in patients with cerebellar ataxia. The subjects were six patients positive for low-titer GAD antibody (cerebellar atrophy. The GAD antibody index in three of the five patients reviewed was >1.0. Two of the six patients were thyroid antibody-positive, and one was both antinuclear- and anti-SS-A antibody-positive. After the administration of immunotherapy to three patients, two showed clear effectiveness, and one, transient effectiveness. Effectiveness was greatest in the two patients with familial occurrence of the disease. In cerebellar ataxia, regardless of family history or isolated illness, it is critical to measure the GAD antibody level, and, even with a low titer level, if the result is positive, immunotherapy should be considered.

  2. Helicobacter pylori Antibody Titer and Gastric Cancer Screening

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    Hiroshi Kishikawa

    2015-01-01

    Full Text Available The “ABC method” is a serum gastric cancer screening method, and the subjects were divided based on H. pylori serology and atrophic gastritis as detected by serum pepsinogen (PG: Group A [H. pylori (− PG (−], Group B [H. pylori (+ PG (−], Group C [H. pylori (+ PG (+], and Group D [H. pylori (− PG (+]. The risk of gastric cancer is highest in Group D, followed by Groups C, B, and A. Groups B, C, and D are advised to undergo endoscopy, and the recommended surveillance is every three years, every two years, and annually, respectively. In this report, the reported results with respect to further risk stratification by anti-H. pylori antibody titer in each subgroup are reviewed: (1 high-negative antibody titer subjects in Group A, representing posteradicated individuals with high risk for intestinal-type cancer; (2 high-positive antibody titer subjects in Group B, representing active inflammation with high risk for diffuse-type cancer; and (3 low-positive antibody titer subjects in Group C, representing advanced atrophy with increased risk for intestinal-type cancer. In these subjects, careful follow-up with intervals of surveillance of every three years in (1, every two years in (2, and annually in (3 should be considered.

  3. E.coli and investigation of antibody titer in rats

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    masoud abdollahi

    2017-03-01

    Full Text Available Introduction: Plant ribosome inactivating proteins act as N-glycosidase enzyme and produce by several family of Caryophyllaceae such as Saponaria Officinalis. Different Isoforms of RIPs expressed by Saponaria Officinalis. SO6 isoform depurinate Adenine 4324 in the conserved GAGA loop of 28SrRNA and disrupts protein synthesis. The aim of this study was expression of SO6 isoform in E.coli and investigation of antibody titer in rats. Methods: In this experimental study, SO6 synthetic gene was excised from recombinant pUC57- SO6 plasmid with BamHI and SalI restriction enzymes and subcloned into pET28a (+ expression vector. The expression of recombinant protein was induced by IPTG. Recombinant SO6 was purified by nickel affinity chromatography. Western blotting was performed to confirm the recombinant protein. Rats were immunized intraperitoneal with purified protein and IgG serum titer was assayed by ELISA. Results: PCR reaction and enzyme digestion confirmed subcloning of SO6 gene into pET28a (+ expression vector. A 29.5kDa protein band on SDS-PAGE showed a high level of recombinant protein expression. Polyclonal antibodies recognized SO6. ELISA confirmed significant antibody titer after injection of protein in test group compared with the control group. Conclusion: The recombinant purified SO6 antigen can be used for anti-cancer and vaccine candidate research.

  4. Do Australian immunoglobulin products meet international measles antibody titer standards?

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    Young, Megan K; Bertolini, Joseph; Kotharu, Pushpa; Maher, Darryl; Cripps, Allan W

    2017-03-04

    The effectiveness of passive immunisation post-exposure to measles appears subject to a dose-response effect. New Zealand and the United Kingdom have increased the recommended dose of polyclonal human immunoglobulin for post-exposure prophylaxis within the last decade in response to concerns about decreasing levels of measles antibodies in these products. This study used the plaque-reduction neutralization test (PRNT) to measure the titer of measles-specific antibodies in Australian immunoglobulin products for post-exposure prophylaxis and compared the utility of an enzyme-linked immunosorbent assay (ELISA) to the PRNT in available Australian and international samples: Australian intramuscular (n = 10), Australian intravenous (n = 28), New Zealand intramuscular (n = 2), Hizentra (subcutaneous)(USA) (n = 3), and Privigen (intravenous)(USA) (n = 2). Measles titres in Australian IM and IV immunoglobulins ranged from 51 to 76 IU/mL and 6 to 24 IU/mL respectively, as measured by PRNT calibrated to the WHO 3 rd international standard. ELISA titres were variable but higher than PRNT titres in all tested samples. Measles antibody titres in Australian immunoglobulin products meet consensus-prescribed international thresholds. Development of a convenient, standardized, readily accessible assay for determination of measles titres in immunoglobulin products would be useful for future studies and facilitate international comparisons.

  5. [Anti-A/B Antibody Titers in Group O Healthy Donors in Hainan Province Area].

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    Yu, Shuai; Huang, Yong-Wen; Wang, Xiao-Xi; Wu, Yue-Qing; Lin, Meng-Xia; Yu, Yang; Luo, Qun

    2015-08-01

    To detect the IgM anti-A (B) and IgG anti-A (B) antibody titers of group O healthy donors in Hainan province area, to understand the distribution of O-type blood donor IgM and IgG antibody titers and to analyze the relationship between antibody titers, so as to provide experimental evidences for the safety and feasibility of urgent transfusion of uncrossmatched group O RBCs. Group O whole blood sample was collected from 80 volunteers blood donors. IgM antibody titrations was performed using the immediate spin (IS) tube, and IgG antibody titration were performed using the column agglutination technique with anti-human globulin (AHG). Using two-way ANOVA, paired t-test and correlation analysis, the different types of antibodies were compared. The IgM antibody titers distributed in 4-1 024, IgG antibody titer distributed in 2-2 048. Anti-A antibody titers of IgG were significantly higher than that of IgM anti-B, IgG anti-B and IgM anti-A titers (P testing costs.

  6. Human antibody titers to Epstein-Barr Virus (EBV) gp350 correlate with neutralization of infectivity better than antibody titers to EBV gp42 using a rapid flow cytometry-based EBV neutralization assay.

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    Sashihara, Junji; Burbelo, Peter D; Savoldo, Barbara; Pierson, Theodore C; Cohen, Jeffrey I

    2009-09-01

    Measurement of neutralizing antibodies to Epstein-Barr virus (EBV) is important for evaluation of candidate vaccines. The current neutralization assay is based on antibody inhibition of EBV transformation of B cells and requires 6 weeks to perform. We developed a rapid, quantitative flow cytometry assay and show that neutralizing antibody titers measured by the new assay strongly correlate with antibody titers in the standard transformation-based assay. Antibodies to EBV gp350 and gp42 have been shown to block infection of B cells by EBV. Using new assays to quantify antibodies to these glycoproteins, we show for the first time that human plasma contains high titers of antibody to gp42; these titers correlate with neutralization of EBV infectivity or transformation. Furthermore, we show that antibody titers to EBV gp350 correlate more strongly with neutralization than antibody titers to gp42. These assays should be useful in accessing antibody responses to candidate EBV vaccines.

  7. Prevalence and titers of yellow fever virus neutralizing antibodies in previously vaccinated adults.

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    Miyaji, Karina Takesaki; Avelino-Silva, Vivian Iida; Simões, Marisol; Freire, Marcos da Silva; Medeiros, Carlos Roberto de; Braga, Patrícia Emilia; Neves, Maria Angélica Acalá; Lopes, Marta Heloisa; Kallas, Esper Georges; Sartori, Ana Marli Christovam

    2017-04-03

    The World Health Organization (WHO) recommends one single dose of the Yellow Fever (YF) vaccine based on studies of antibody persistency in healthy adults. We assessed the prevalence and titers of YF virus neutralizing antibodies in previously vaccinated persons aged  60 years, in comparison to younger adults. We also evaluated the correlation between antibody titers and the time since vaccination among participants who received one vaccine dose, and the seropositivity among participants vaccinated prior to or within the past 10 years. previously vaccinated healthy persons aged  18 years were included. YF virus neutralizing antibody titers were determined by means of the 50% Plaque Reduction Neutralization Test. 46 persons aged  60 years and 48 persons aged 18 to 59 years were enrolled. There was no significant difference in the prevalence of YF virus neutralizing antibodies between the two groups (p = 0.263). However, titers were significantly lower in the elderly (p = 0.022). There was no correlation between YF virus neutralizing antibody titers and the time since vaccination. There was no significant difference in seropositivity among participants vaccinated prior to or within the past 10 years. the clinical relevance of the observed difference in YF virus neutralizing antibody titers between the two groups is not clear.

  8. Distribution of antibody titer against Salmonella enterica among healthy individuals in nepal

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    Koirala Janak

    2009-01-01

    Full Text Available Abstract Background Enteric fever is an endemic problem in Nepal and Widal agglutination test is widely used for its diagnosis but a normal baseline titer in healthy population and cutoff values have not been established. Methods We measured average baseline antibody titers against "O" and "H" antigens of Salmonella enterica serotype Typhi and "H" antigens of serotypes Paratyphi A and Paratyphi B among apparently healthy blood donors in Nepal. The antibody titers were measured using Standard Widal Confirmatory Quantitative Tube test. Results Among the 100 blood samples collected from healthy volunteers, 62 individuals had significant antibody titers (≥ 1:20 against one of the four antigens against S. enterica. Among 54 samples with an anti-O titer against serotype Typhi, 15 and 36 samples had titers of ≥ 1:60 and ≥ 1:40, respectively. A significant proportion (12% of all had anti-O titer of ≥ 1:80. Similarly, among the 59 samples demonstrating anti-H titers of ≥ 1:20 to S. enterica serotype Typhi, 29 had a titer of ≥ 1:80 and 12 had 1:160. For S. enterica serotypes Paratyphi A and B, anti-H titers of ≥ 1:20 were found only in 12% and 3%, respectively, of all samples tested. Conclusion When a single Widal agglutination titer is used for the diagnosis of enteric fever, it will be more appropriate to change the currently used cutoff levels against S. enterica serotype Typhi to > 1:80 for anti-O and > 1:160 for anti-H titers for Nepal.

  9. Hashimoto encephalopathy in pediatric patients: Homogeneity in clinical presentation and heterogeneity in antibody titers.

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    Lee, Jiwon; Yu, Hee Joon; Lee, Jeehun

    2018-01-01

    Hashimoto encephalopathy is an autoimmune encephalopathy characterized by elevated antithyroid antibodies and a favorable response to corticosteroid. This study delineated the clinical characteristics of pediatric Hashimoto encephalopathy and the significance of low antithyroid antibody titers in diagnosis and treatment. Clinical manifestations, antibody titers, and treatment responses were retrospectively reviewed in six consecutive children diagnosed with Hashimoto encephalopathy between August 2008 and July 2016. Age at diagnosis was 10-17years. Presenting symptoms were seizures, altered consciousness, behavioral changes, psychosis, tremor, and dystonia. Thyroid function was normal in five patients, and one had hypothyroidism prior to the encephalopathy. Antithyroid antibody titer was increased at presentation in five patients and one week later in the other. Antibody levels were extremely varied (anti-thyroglobulin, 20.5-2318.0U/ml; anti-thyroid peroxidase, 12.5-2231.0U/ml; reference range, Hashimoto encephalopathy were similar, irrespective of antithyroid antibody titer. Because the initial antithyroid antibody titers can be normal or mildly-elevated, follow-up testing of antithyroid antibodies is required in patients who are clinically suspect for Hashimoto encephalopathy. Copyright © 2017 The Japanese Society of Child Neurology. Published by Elsevier B.V. All rights reserved.

  10. High Titers of Chlamydia trachomatis Antibodies in Brazilian Women with Tubal Occlusion or Previous Ectopic Pregnancy

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    A. C. S. Machado

    2007-01-01

    Full Text Available Objective. To evaluate serum chlamydia antibody titers (CATs in tubal occlusion or previous ectopic pregnancy and the associated risk factors. Methods. The study population consisted of 55 women wih tubal damage and 55 parous women. CAT was measured using the whole-cell inclusion immunofluorescence test and cervical chlamydial DNA detected by PCR. Odds ratios were calculated to assess variables associated with C. trachomatis infection. Results. The prevalence of chlamydial antibodies and antibody titers in women with tubal occlusion or previous ectopic pregnancy was significantly higher (P<.01 than in parous women. Stepwise logistic regression analysis showed that chlamydia IgG antibodies were associated with tubal damage and with a larger number of lifetime sexual partners. Conclusions. Chlamydia antibody titers were associated with tubal occlusion, prior ectopic pregnancy, and with sexual behavior, suggesting that a chlamydia infection was the major contributor to the tubal damage in these women.

  11. The Effect of Perceived Stress on Epstein-Barr Virus Antibody Titers in Appalachian Ohio Women.

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    Brook, Melissa J; Christian, Lisa M; Hade, Erinn M; Ruffin, Mack T

    2017-01-01

    The Appalachian population suffers a disparate burden of chronic stress leading to high perceived stress. The study aim was to determine the association between perceived stress and Epstein-Barr virus (EBV) antibody titers, along with the impact of perceived social support, Appalachian self-identify, and health behaviors. Serum EBV VCA-IgG antibody titer levels from 169 female Appalachian residents (aged 18-26 years) were examined. Perceived stress, perceived social support, Appalachian self-identity, and health behaviors were assessed via self-administered questionnaires. There were 169 of 185 women positive for EBV. Among these women, the median EBV antibody titer level was 404 U/mL (range 101-6,464), and the overall geometric mean was 563.2 (95% CI 486.6-651.9). For a 1-point increase in perceived stress, the EBV antibody titer increased by 1.92% (95% CI 0.04-3.76%). For every point increase in perceived social support, the EBV antibody titer decreased by 1.00% (95% CI 0.06-1.98%). Perceived stress was significantly associated with sleep quality, BMI, and current smoking status, but not with binge-drinking, drug use, or Appalachian self-identity. No mediating effects of sleep quality, BMI, binge-drinking, current drug use, or >4 sexual partners were observed in the relationship between perceived stress and EBV titer level. Young Appalachian women reported high levels of perceived stress that were significantly associated with higher EBV titers. Higher perceived social support was associated with lower EBV titers. Health behaviors and Appalachian self-identity did not impact the relationship between perceived stress and EBV titers. © 2017 S. Karger AG, Basel.

  12. Assay signal as an alternative to titer for assessment of magnitude of an antidrug antibody response.

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    Starcevic Manning, Marta; Kroenke, Mark A; Lee, Stephanie A; Harrison, Simon E; Hoofring, Sarah A; Mytych, Daniel T; Jawa, Vibha

    2017-10-12

    Titer methods are commonly used to characterize the magnitude of an antidrug antibody response. Assay S/N is an appealing alternative, but the circumstances under which use of signal-to-noise (S/N) is appropriate have not been well defined. We validated both titer and S/N-based methods for several therapeutics. S/N correlated strongly with titer both in aggregate and when examined on a per subject basis. Analysis of impact of antibody magnitude on pharmacokinetics yielded the same result using either method. Each assay demonstrated excellent precision, good linearity, and adequate drug tolerance. Under these circumstances, assay S/N is a valid alternative to titer for assessment of the magnitude of an antidrug antibody response.

  13. The clinical significance comparison of a latex agglutination based syphilis screening test at low antibody titer.

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    Wang, Hua-Cheng; Chen, Cha; Wang, Li-Na; Long, Yi-Fei; Zhang, Wei-Zheng; Li, You-Qiang; Xiao, Qian; Yuan, Hui

    2013-01-01

    The rapid increase of syphilis underscores a tremendous need to carefully evaluate many new serological tests for syphilis and choose efficient and economical strategies for syphilis screening, especially in the case of primary infection with low antibody titer. Between 2011 and 2012, 73 patients' sera samples were included in this retrospective study. They were either TRUST or TPPA reactive, either LA (latex agglutination) based auto3 TP or CLIA (chemiluminescence assay) based Architect Syphilis TP assay reactive. The contradictory weak response samples were further examined by FTA-Abs method. TPPA could not give reactive results in samples with antibody concentration less than 10 mIU. Auto3 TP reagent shows good linearity at low antibody titers and was more sensitive than TPPA, while the former does not show significant superiority compared to the Architect Syphilis TP assay at low antibody titer, except that it is suitable for adaptation on diverse automated chemistry analyzers.

  14. Antiphospholipid Antibody Titers and Clinical Outcomes in Patients with Recurrent Miscarriage and Antiphospholipid Antibody Syndrome: A Prospective Study

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    Yu Song

    2017-01-01

    Conclusions: Anti-β2-GP1 IgM was the predominant form of antibody in patients with RM and APS. The decreases in antiphospholipid antibody titers correlated with better pregnancy outcomes. The shorter treatment regimen was effective and economical.

  15. Activity, specificity, and titer of naturally occurring canine anti-DEA 7 antibodies.

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    Spada, Eva; Proverbio, Daniela; Baggiani, Luciana; Canzi, Ilaria; Perego, Roberta

    2016-11-01

    The reported prevalence of naturally occurring anti-dog erythrocyte antigen (DEA) 7 antibodies in DEA 7-negative dogs is as high as 50%. Characterization of these antibodies may better define their importance in canine transfusion medicine. We determined in vitro activity, specificity, and titer of anti-DEA 7 antibodies in DEA 7-negative dogs. Plasma samples from 317 DEA 7-negative dogs were cross-matched with DEA 7-positive red blood cells (RBCs) using gel column technology. Agglutination occurred with DEA 7-positive RBCs but not with DEA 7-negative RBCs in 73 samples (23%), which were hence classified as containing anti-DEA 7 antibodies. These samples were evaluated for hemolytic and agglutinating activity, strength of agglutination, and antibody specificity and titers. All samples showed agglutination but none showed hemolysis. Gel agglutination was graded as 1+ for 20 samples (27%), 2+ for 49 samples (67%), 3+ for 4 samples (6%); no samples were graded 4+. The agglutination titer was DEA 7 antibodies were found in 23% of DEA 7-negative dogs. The presence of naturally occurring anti-DEA 7 antibodies suggests that cross-matching of canine blood recipients is advisable, even at first transfusion, to minimize delayed transfusion reactions. © 2016 The Author(s).

  16. Genetic parameters for natural antibody isotype titers in milk of Dutch Holstein-Friesians

    NARCIS (Netherlands)

    Wijga, S.; Bovenhuis, H.; Bastiaansen, J.W.M.; Arendonk, van J.A.M.; Ploegaert, T.C.W.; Tijhaar, E.; Poel, van der J.J.

    2013-01-01

    The objective of the present study was to estimate genetic parameters for natural antibody isotypes immunoglobulin (Ig) A, IgG1 and IgM titers binding the bacterial antigens lipopolysaccharide, peptidoglycan and the model antigen keyhole limpet hemocyanin in Dutch Holstein-Friesian cows (n = 1695).

  17. Clinicoimmunopathologic findings in Atlantic bottlenose dolphins Tursiops truncatus with positive Chlamydiaceae antibody titers.

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    Bossart, Gregory D; Romano, Tracy A; Peden-Adams, Margie M; Schaefer, Adam; McCulloch, Stephen; Goldstein, Juli D; Rice, Charles D; Fair, Patricia A; Cray, Carolyn; Reif, John S

    2014-02-04

    Sera from free-ranging Atlantic bottlenose dolphins Tursiops truncatus inhabiting the Indian River Lagoon (IRL), Florida, and coastal waters of Charleston (CHS), South Carolina, USA, were tested for antibodies to Chlamydiaceae as part of a multidisciplinary study of individual and population health. A suite of clinicoimmunopathologic variables was evaluated in Chlamydiaceae-seropositive dolphins (n = 43) and seronegative healthy dolphins (n = 83). Fibrinogen, lactate dehydrogenase, amylase, and absolute numbers of neutrophils, lymphocytes, and basophils were significantly higher, and serum bicarbonate, total alpha globulin, and alpha-2 globulin were significantly lower in dolphins with positive Chlamydiaceae titers compared with seronegative healthy dolphins. Several differences in markers of innate and adaptive immunity were also found. Concanavalin A-induced T lymphocyte proliferation, lipopolysaccharide-induced B lymphocyte proliferation, and granulocytic phagocytosis were significantly lower, and absolute numbers of mature CD 21 B lymphocytes, natural killer cell activity and lysozyme concentration were significantly higher in dolphins with positive Chlamydiaceae antibody titers compared to seronegative healthy dolphins. Additionally, dolphins with positive Chlamydiaceae antibody titers had significant increases in ELISA antibody titers to Erysipelothrix rhusiopathiae. These data suggest that Chlamydiaceae infection may produce subclinical clinicoimmunopathologic perturbations that impact health. Any potential subclinical health impacts are important for the IRL and CHS dolphin populations, as past studies have indicated that both dolphin populations are affected by other complex infectious and neoplastic diseases, often associated with immunologic perturbations and anthropogenic contaminants.

  18. High natural antibody titers of indigenous chickens are related with increased hazard in confinement

    NARCIS (Netherlands)

    Wondmeneh, E.; Arendonk, van J.A.M.; Waaij, van der E.H.; Ducro, B.J.; Parmentier, H.K.

    2015-01-01

    Natural antibody (NAb) levels and survival rates were evaluated in 4 breeds of laying hens in Ethiopia: indigenous, improved indigenous, exotic layer, and crossbred. Titers of NAb isotypes IgG and IgM binding keyhole limpet hemocyanin (KLH) in serum were measured at 20, 26, 35, and 45 wk age.

  19. Ekstrak Pegagan Meningkatkan Titer Antibodi Mencit Setelah Diinfeksi Salmonella typhi (CENTELLA ASIATICA EXTRACT INCREASE ANTIBODY TITER IN MICE AFTER SALMONELLA TYPHI INFECTION

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    I Nengah Kerta Besung

    2013-09-01

    Full Text Available A study was conducted to find out the ability of Centella asiatica (C. asiatica in enhancing antibodyresponse of C. asiatica treated mice following Salmonella typhi (S. typhi infections. It is therefore expectedthat herbal drug such as  C. asiatica  can be used as an alternative medicine to prevent and to curesalmonellosis both in animals and human. Experimental laboratory studies were conducted usingCompletely Factorial Randomized Design. Mice were divided into four groups and they were treatedrespectively with destilated water (negative control, 125, 250, and 500 mg/kg BW/day of  C. asiaticaextract. The treatment was conducted daily for two weeks  and the mice were inoculated with 105 cells/mlof  S. typhi. The antibody response were examined by indirect enzyme-linked immunosorbent assay (ELISAon first day, second week and fourth week  after S. typhi infections.  The result showed that treatment ofmice with C. asiatica extract significantly (p<0,05 enhanced antibody titer of Balb/c mice after S. typhiinfections. The highest antibody titer was observed at four weeks after S. typhi infections with 500 mg/kgBW/day (94,0370 ± 1,69 IU.

  20. Antibody titers for canine parvovirus type-2, canine distemper virus, and canine adenovirus type-1 in adult household dogs.

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    Taguchi, Masayuki; Namikawa, Kazuhiko; Maruo, Takuya; Orito, Kensuke; Lynch, Jonathan; Sahara, Hiroeki

    2011-09-01

    Serum antibody titers for canine parvovirus type-2 (CPV-2), canine distemper virus (CDV) and canine adenovirus type-1 (CAV-1) were investigated in 1031 healthy adult household dogs (2 to 18 years old) given an annual inoculation in the previous 11 to 13 months. The number of dogs retaining significant titers of antibodies against CPV-2, CDV, and CAV-1 were 888 (86%), 744 (72%), and 732 (71%), respectively. There were no differences between males and females in antibody titers against the 3 viruses. Antibody titer for CPV-2 was significantly higher in younger dogs than in older dogs, CDV antibody was significantly higher in older dogs than in younger dogs, and CAV titer was not associated with age.

  1. The relationship of the possible allergic response to jellyfish envenomation and serum antibody titers.

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    Russo, A J; Calton, G J; Burnett, J W

    1983-01-01

    The sera of patients envenomated by the sea nettle (Chrysaora quinquecirrha) or the Portuguese man-o'war (Physalia physalis) were investigated for immune specific and cross-reacting antibodies. Crude or partially purified (SP-Sephadex column chromatography) nematocyst venom was used as antigen in an enzyme-linked immunosorbent assay (ELISA) designed to detect IgG and IgE antibodies. The sera of 66 patients who exhibited strictly cutaneous, extracutaneous or anaphylactoid reactions to envenomation were studied. Most of the subjects developed an IgG antibody and many developed an IgE antibody to the venom of the offending animal. The titer of both immunoglobulins correlated directly with the severity of symptoms. Cross-reacting antibodies to these two jellyfish were apparent in a significant number of patients, but detectable cross-reacting IgE antibodies were rare in patients severely stung by the sea nettle. The titer of specific IgG antibody was higher against the partially purified lethal sea nettle venom than fractions lacking lethal activity. These results may support the hypothesis that some of the visible response to jellyfish envenomation may be allergic in nature and that cross-reactivity to these venoms may be clinically important.

  2. Prevalence of antibody titers to leptospira spp. in Minnesota white-tailed deer

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    Goyal, S.M.; Mech, L.D.; Nelson, M.E.

    1992-01-01

    Serum samples (n = 204) from 124 white-tailed deer (Odocoileus virginianus) in northeastern Minnesota (USA) were collected from 1984 through 1989 and tested for antibodies to six serovars of Leptospira interrogans (bratislava, canicola, grippotyphosa, hardjo, icterohemorrhagiae, and pomona) using a microtiter agglutination test. Eighty-eight (43%) sera were positive at greater than or equal to 1:100 for antibodies against serovars pomona and/or bratislava; none was positive for any of the other four serovars. None of the 31 sera collected in 1984-85 was positive, whereas all 54 sera collected from 1986 through 1988 had titers of greater than or equal to 1:100. During 1989, only 34 (29%) of 119 sera had titers of greater than or equal to 1:100. Based on these results, we believe there to be wide variability in exposure of Minnesota deer to Leptospira interrogans.

  3. Interference of daratumumab with pretransfusion testing, mimicking a high-titer, low avidity like antibody

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    Mei-Hwa Lin

    2017-01-01

    Full Text Available Daratumumab is a monoclonal immunoglobulin against CD38 and has been approved for treating patients with refractory multiple myeloma. The presence of daratumumab in the sera can interfere with pretransfusion testing due to the weakly expression of CD38 on red cells. The reactivity could be mistaken as autoantibody (if autocontrol is positive or alloantibody (if autocontrol is negative. We present a case that demonstrates daratumumab could mimic a high titer low avidity (HTLA alloantibody. A 34-year-old male patient of refractory myeloma was recruited in phase three clinical trial involving daratumumab. Samples were sent to the blood bank for pretransfusion testing. Without knowledge of patient having used daratumumab, we mistook the reactivity in the patient's sera as an HTLA antibody due to the results of negative autocontrol and high titers of antibody activity. Antibody screen showed a panreactive pattern and the reactivity against screening cells was up to a titer of 1: 1240. The reactivity was weaker against cord cells than adult cells, became weaker against ZZAP-treated cells and became negative against DDT-treated cells. A discussion with attending physician finally revealed the reactivity was due to the interference caused by daratumumab. The case demonstrates good communication is essential in performing pretransfusion testing for patients receiving daratumumab and other new biological regimens that can interfere with compatibility test.

  4. Interference of daratumumab with pretransfusion testing, mimicking a high-titer, low avidity like antibody.

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    Lin, Mei-Hwa; Liu, Fei-Yun; Wang, Hsiu-Mien; Cho, Hsin-Ching; Lo, Shyh-Chyi

    2017-01-01

    Daratumumab is a monoclonal immunoglobulin against CD38 and has been approved for treating patients with refractory multiple myeloma. The presence of daratumumab in the sera can interfere with pretransfusion testing due to the weakly expression of CD38 on red cells. The reactivity could be mistaken as autoantibody (if autocontrol is positive) or alloantibody (if autocontrol is negative). We present a case that demonstrates daratumumab could mimic a high titer low avidity (HTLA) alloantibody. A 34-year-old male patient of refractory myeloma was recruited in phase three clinical trial involving daratumumab. Samples were sent to the blood bank for pretransfusion testing. Without knowledge of patient having used daratumumab, we mistook the reactivity in the patient's sera as an HTLA antibody due to the results of negative autocontrol and high titers of antibody activity. Antibody screen showed a panreactive pattern and the reactivity against screening cells was up to a titer of 1: 1240. The reactivity was weaker against cord cells than adult cells, became weaker against ZZAP-treated cells and became negative against DDT-treated cells. A discussion with attending physician finally revealed the reactivity was due to the interference caused by daratumumab. The case demonstrates good communication is essential in performing pretransfusion testing for patients receiving daratumumab and other new biological regimens that can interfere with compatibility test.

  5. High titer of anti-phosphatidylserine-prothrombin complex antibodies in patients with cutaneous polyarteritis nodosa.

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    Kawakami, Tamihiro; Yamazaki, Masahide; Mizoguchi, Masako; Soma, Yoshinao

    2007-12-15

    To investigate possible correlations between cutaneous polyarteritis nodosa (CPN) and antiphospholipid syndrome-associated antibodies. Sixteen patients were referred with CPN features. To investigate the possible role of antiphospholipid antibodies (aPL) in CPN, we measured serum lupus anticoagulant (LAC), IgG and IgM anticardiolipin (aCL) and anti-phosphatidylserine-prothrombin complex (anti-PS/PT) antibodies, and anti-beta(2)-glycoprotein I-dependent cardiolipin (anti-beta(2)GPI/CL) antibodies in the 16 CPN patients, 8 microscopic polyangiitis (MPA) patients, 33 systemic lupus erythematosus (SLE) patients, and 23 healthy controls. LAC was determined according to the Subcommittee on Lupus Anticoagulant/Phospholipid Dependent Antibody guidelines. Anti-PS/PT, aCL, and anti-beta(2)GPI/CL antibodies were measured by enzyme-linked immunosorbent assay. Anti-PS/PT antibodies and/or LAC were detected in all CPN patients, but not in any controls. Serum IgM anti-PS/PT antibody was found in 13 (81.3%) CPN patients. The mean +/- SD serum anti-PS/PT IgM level (19.9 +/- 12.4 units/ml) in CPN patients was significantly elevated compared with SLE patients (5.7 +/- 5.9 units/ml). IgG anti-PS/PT antibody was detected in 5 (31.3%) CPN patients, but not in any controls. The IgG PS/PT antibody titers were similar in CPN patients (12.3 +/- 12.0 units/ml) and SLE patients (13.8 +/- 14.3 units/ml). Three (18.8%) CPN patients were positive for IgG aCL antibody and 2 (12.5%) for IgM aCL antibody. No MPA patients had aPL. CPN skin manifestations included livedo reticularis (14 [87.5%]). Direct immunofluorescence (DIF) revealed C3 within the affected vessels in 7 (77.8%) of 9 CPN patients. Our study demonstrated that presence of anti-PS/PT antibodies and/or LAC could serve as markers in CPN patients. CPN could be dependently associated with the presence of anti-PS/PT antibody. Clinicians need to recognize these titers to permit early accurate diagnosis and treatment. We believe that anti

  6. Association between Gastric Cancer Risk and Serum Helicobacter pylori Antibody Titers

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    Mitsutaka Shuto

    2017-01-01

    Full Text Available Background/Aims. It is difficult to confirm the accurate cutoff value to diagnose Helicobacter pylori (Hp infection using commercial serology kits. It is reported that there were many cases with present/past infection that even the serum Hp-IgG antibody (HpAb titers were below the cutoff value (e.g., 10 U/mL for E-Plate®, suggesting that we might overlook many gastric cancer (GC. We investigated an association between gastric cancer risk and serum Helicobacter pylori antibody titers. Methods. We conducted a primary screening between 2014 and 2015. We performed gastroendoscopy if HpAb titers were ≥3.0 U/mL (i.e., more than measurable limit, E-Plate. These patients were divided into two groups: HpAb = 3.0–9.9 U/mL (“negative-high” group and HpAb ≥ 10 U/mL; cutoff value (“over-10 U/mL” group. Hp infection status was investigated, and the number of GC patients was counted. Results. Among the 3321 subjects in the primary screening, 56.9% (1891/3321 showed HpAb titers ≥3.0 U/mL; 1314 patients underwent gastroendoscopy. Ten were GC. 421 patients were “negative-high” group; two were GC. After evaluating 381 patients for Hp infection, 22.6%/60.6% was with present/past infection among the “negative-high” group. Conclusion. We also found a correlation between HpAb titers and Hp infection status. “Negative-high” group has a risk of GC.

  7. Microinfusion of antineuronal antibodies into rodent striatum: failure to differentiate between elevated and low titers.

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    Singer, Harvey S; Mink, Jonathan W; Loiselle, Christopher R; Burke, Kathleen A; Ruchkina, Irina; Morshed, Syed; Parveen, Salina; Leckman, James F; Hallett, Joseph J; Lombroso, Paul J

    2005-06-01

    An autoimmune-mediated mechanism has been proposed for several pediatric movement disorders. In a three-center (Brown, Yale, and Johns Hopkins) collaborative effort, serum antineuronal antibodies (ANAb) were measured by use of ELISA or immunohistochemical techniques on 35 children (mean age 11.4 years) with Tourette syndrome, attention deficit hyperactivity disorder, and/or obsessive compulsive disorder. Eight sera, 4 containing the highest and 4 the lowest levels of ANAb, were identified at each institution. Selected sera (total of 9 with elevated and 7 with low ANAb) were re-encoded and sent to each center for infusion into the ventrolateral striatum of 16 male Sprague-Dawley rats. Animals were observed for behavioral abnormalities for 3 days before the start of infusion, during infusion on days 2-4, and for 2 days after infusion. Combined stereotypy scores increased after antibody infusion, but there was no significant effect based on serum titer (p=0.85). Scores differed among centers, but analyses based on individual institutional data again failed to show an effect based on elevated or low ANAb values (Brown, p=0.95; Yale and Johns Hopkins, p=0.81). Post hoc studies with sham surgery and infusion of phosphate-buffered saline support suggestions of nonspecific behavioral effects unrelated to antibody titer. This report emphasizes that any conclusions about antibody-mediated movement disorders that are based upon results from the rodent infusion model must be considered with caution.

  8. STREPTOKINASE EFFICACY IN MYOCARDIAL INFARCTION MANAGEMENT: IS IT RELATED TO SERUM ANTISTREPTOKINASE ANTIBODY TITER

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    H SHEMIRANI

    2000-06-01

    Full Text Available Introduction. Antistreptokinase antibodies in sera of individuals with previous streptococcal infection might theoretically influence the thrombolytic activity of streptokinase. Streptokinase as the only thrombolytic drug is used in MI management in Iran. Since, the prevalence of streptococcal infections are higher in Iranian population, it seems that high level of antibodies in sera of patients would decrease the thrombolytic effect of Streptokinase. Methods. Antistreptokinase antibodies were measured by Home Made EL/SA method before streptokinase administration in 126 patients with MI who were admitted to Noor hospital (affiliated to Isfahan University of Medical Sciences and Health Services. The effect of drug with regard to ECG changes in following days were studied and compared. Results. In seventy patients of 126 (13.5 percent, the drug was ineffective and the antibody level was high. While in 25 patients with effective response to drug (no appearing of Q wave, 3 patients have a high level of antibody against streptokinase. Discussion. It seems that high level of serum antistreptokinase antibody titer has no significant interaction with thrombolytic activity of streptokinase in management of MI. However, most accurate study is required to test this hypothesis.

  9. Changes in West Nile virus seroprevalence and antibody titers among Wisconsin mesopredators 2003-2006.

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    Docherty, Douglas E; Samuel, Michael D; Egstad, Kristina F; Griffin, Kathryn M; Nolden, Cherrie A; Karwal, Lovkesh; Ip, Hon S

    2009-07-01

    After the 2001 occurrence of West Nile virus (WNV) in Wisconsin (WI), we collected sera, during 2003-2006, from south-central WI mesopredators. We tested these sera to determine WNV antibody prevalence and geometric mean antibody titer (GMAT). Four-fold higher antibody prevalence and 2-fold higher GMAT in 2003-2004 indicated greater exposure of mesopredators to WNV during the apparent epizootic phase. The period 2005-2006 was likely the enzootic phase because WNV antibody prevalence fell to a level similar to other flaviviruses. Our results suggest that, in mesopredators, vector-borne transmission is the primary route of infection and WNV antibodies persist for < 1 year. Mesopredators may be sensitive indicators of West Nile virus spill-over into humans and horses. Mesopredator sero-surveys may complement dead crow surveillance by providing additional data for the timing of public health interventions. Research is needed to clarify the dynamics of WNV infection in these mammals and their role as potential WNV amplifiers.

  10. Early low-titer neutralizing antibodies impede HIV-1 replication and select for virus escape.

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    Katharine J Bar

    Full Text Available Single genome sequencing of early HIV-1 genomes provides a sensitive, dynamic assessment of virus evolution and insight into the earliest anti-viral immune responses in vivo. By using this approach, together with deep sequencing, site-directed mutagenesis, antibody adsorptions and virus-entry assays, we found evidence in three subjects of neutralizing antibody (Nab responses as early as 2 weeks post-seroconversion, with Nab titers as low as 1∶20 to 1∶50 (IC(50 selecting for virus escape. In each of the subjects, Nabs targeted different regions of the HIV-1 envelope (Env in a strain-specific, conformationally sensitive manner. In subject CH40, virus escape was first mediated by mutations in the V1 region of the Env, followed by V3. HIV-1 specific monoclonal antibodies from this subject mapped to an immunodominant region at the base of V3 and exhibited neutralizing patterns indistinguishable from polyclonal antibody responses, indicating V1-V3 interactions within the Env trimer. In subject CH77, escape mutations mapped to the V2 region of Env, several of which selected for alterations of glycosylation. And in subject CH58, escape mutations mapped to the Env outer domain. In all three subjects, initial Nab recognition was followed by sequential rounds of virus escape and Nab elicitation, with Nab escape variants exhibiting variable costs to replication fitness. Although delayed in comparison with autologous CD8 T-cell responses, our findings show that Nabs appear earlier in HIV-1 infection than previously recognized, target diverse sites on HIV-1 Env, and impede virus replication at surprisingly low titers. The unexpected in vivo sensitivity of early transmitted/founder virus to Nabs raises the possibility that similarly low concentrations of vaccine-induced Nabs could impair virus acquisition in natural HIV-1 transmission, where the risk of infection is low and the number of viruses responsible for transmission and productive clinical

  11. Determination of Rubella Antibody Titer in Women of Reproductive Age, Birjand, 2001-2002.

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    s M Hossaini

    2005-01-01

    Full Text Available Introduction: Rubella infection in pregnancy results in abortion, fetal death or Congenital Rubella Syndrome. It has been since many years that the titer of rubella antibody in children and women in the reproductive age group is measured in order to have a proper vaccination program for the control of rubella and its complications. The aim was to study the immunity of women in the reproductive age group in Birjand so as to apply the obtained data for the health program. Material and methods: This research was a descriptive study done on 271 women referring to the treatment and health center for routine pre-marriage tests. The antibody titer was detected by the ELISA method using an American23 kit (Trinity Biotech. The results were statistically evaluated with SPSS program. Results: This study showed that of the 271 case, 95.2% were immune and 4.8% were sensitive to rubella. There was no significant relationship with age, living place, parent’s education, level of education and number of children in the family. Conclusion: Considering the lack of immunity against rubella in 4.8% of women at reproductive age, vaccination for girls at the age of marriage seems to be necessary.

  12. Phenotypic responses of chickens to long-term selection for high or low antibody titers to sheep red blood cells.

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    Zhao, X L; Honaker, C F; Siegel, P B

    2012-05-01

    A long-term bidirectional selection experiment was conducted to study antibody response to SRBC. Lines, high antibody selection (HAS) and low antibody selection (LAS), originating from the same White Leghorn base population had undergone 37 generations of selection for either high or low antibody response 5 d after a single intravenous injection of 0.1 mL of a 0.25% suspension of SRBC antigen. Subpopulations, where selection was relaxed, were maintained as contemporaries with the selected lines from generations 16 to 24 [high antibody relaxed (HAR) and low antibody relaxed (LAR)] and 24 to 37. Body weights were obtained at 4, 24, and 38 wk of age and at the onset of lay (BW at first egg). Also measured were age in days to first egg, percentages of hen-day ovulations and normal egg production, and percentages of normal and defective eggs from total ovulation (PNE and PDE). Selection lead to a large divergence in antibody titers between the selected lines, with a plateau reached in line LAS. Line HAS and HAR females displayed higher antibody titers, lower BW4, and matured at older ages than those from LAS and LAR (P selected lines, being positive in line LAS and negative in line HAS. Quadratic regression models fit well with antibody titers, BW4, and PNE, with limiting values for these traits calculated based on regression curves. For line HAS, plots showed that an increased tendency of antibody titers was followed by decreased BW4 and increased PNE. For line LAS, however, antibody titers and BW4 decreased in parallel while PNE increased. It appears that at the phenotypic level there was a resource balance between immune response, growth, and reproductive traits, which during long-term selection, individuals altered their dynamic of resource allocations to satisfy certain needs.

  13. Brief Report: Changes in Antiphospholipid Antibody Titers During Pregnancy: Effects on Pregnancy Outcomes.

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    Yelnik, Cecile M; Porter, T Flint; Branch, D Ware; Laskin, Carl A; Merrill, Joan T; Guerra, Marta M; Lockshin, Michael D; Buyon, Jill P; Petri, Michelle; Sammaritano, Lisa R; Stephenson, Mary D; Kim, Mimi Y; Salmon, Jane E

    2016-08-01

    To measure variance in antiphospholipid antibody (aPL) levels during pregnancy and to determine if variation affects pregnancy outcomes. We used data from the PROMISSE (Predictors of Pregnancy Outcome: Biomarkers in Antiphospholipid Antibody Syndrome and Systemic Lupus Erythematosus) study, a multicenter prospective study of pregnant women with aPL and/or systemic lupus erythematosus (SLE). Antiphospholipid antibodies were considered present if any of the following were positive: anticardiolipin (aCL), anti-β2 -glycoprotein I (anti-β2 GPI) titers ≥40 IgG phospholipid (GPL) or IgM phospholipid (MPL) units, and/or lupus anticoagulant (LAC). Antiphospholipid antibodies were measured every trimester and postpartum. Adverse pregnancy outcomes were defined as fetal/neonatal death, preterm delivery (LAC frequency also decreased, but 75% of patients remained positive through the second trimester. Only 4% of patients with aPL at baseline did not have aPL in either the second or third trimesters. Changes in aPL levels or aPL status were not associated with adverse pregnancy outcomes. LAC was the only aPL associated with adverse pregnancy outcomes. The aPL in the cohort decreased marginally during pregnancy, and changes were not associated with pregnancy outcomes. Our results suggest that, among women with aPL and/or SLE, measuring aPL early in pregnancy is sufficient to assess risk. Repeat aPL testing through pregnancy is unnecessary. © 2016, American College of Rheumatology.

  14. A rare case of recurrent pregnancy loss associated with high-titer positivity for perinuclear anti-neutrophilic cytoplasmic antibodies

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    Akhila Vasudeva

    2012-01-01

    Full Text Available We present a case of recurrent pregnancy loss associated with unusual constellation of utoimmunity-related features such as hypertension, severe hrombocytopenia, hypothyroidism and persistent high titers of perinuclear antineutrophilic cytoplasmic antibodies. Her clinical features did not fit into a particular diagnosis of vasculitides, systemic lupus erythematosis (SLE or other known autoimmune diseases where this autoantibody is found in high titers. We report the unusual association of this autoantibody with recurrent early fetal demise in this case.

  15. Rubella specific cell-mediated and humoral immunity following vaccination in college students with low antibody titers.

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    Terada, Kihei; Itoh, Yuri; Wakabayashi, Tokio; Teranishi, Hideto; Akaike, Hiroto; Ogita, Satoko; Ouchi, Kazunobu

    2015-11-09

    This study measured cell-mediated immunity (CMI) and antibodies to clarify the basis of rubella reinfection after vaccination. In a pool of 65 college students, 39 who exhibited hemagglutination-inhibition (HI) antibody titers against rubella of ≤ 1:16 were vaccinated with a rubella vaccine. The CMI was assessed with interferon-gamma release assay. There was low correlation (r = 0.24) between the antibody titers and interferon-gamma levels at pre-vaccination status. Preexisting interferon-gamma levels were low in some subjects with low HI antibody titers of 1:8 and 1:16. Fifty-seven percent (4/7) of the subjects who were antibody-negative with past history of rubella vaccination at entry onto the study exhibited CMI. And 57% (4/7) of the subjects remained antibody-negative following a second vaccination, despite exhibiting CMI. HI antibody titers increased significantly after vaccination, whereas post-vaccination interferon-gamma levels did not exhibit significant increases. When subjects were divided (based on their past history of vaccination and antibody values) into natural infection and vaccination groups, HI antibody titers (mean ± SD) increased to 1:2(4.4 ± 1.4) from 1: 2(3.2 ± 0.4) (p = 0.065) in the natural infection group and to 1:2(4.4 ± 1.0) from 1:2(3.0 ± 0.8) (p rubella reinfection can occur in vaccinated seropositive individuals. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. Viral antibody titers are influenced by HLA-DR2 phenotype.

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    Lio, D; Caccamo, N; D'Anna, C; Cigna, D; Candore, G; Caruso, C

    1994-01-01

    Antibody serum levels against herpes simplex type 1 virus, cytomegalovirus, viral capsid antigens of Epstein-Barr virus, and rubella virus were evaluated in a sample of the Sicilian population. Results demonstrated that HLA-DR2-positive individuals showed a significant increase in antibody titers, when compared to HLA-DR2-negative individuals. These observations seem to be in contrast with the reported association of the HLA-DR2 phenotype with an ineffective immune response against several infectious pathogens. On the other hand, an increased humoral response to viral antigens need not be interpreted as a marker for effective control of virus infections. In fact, the response to virus infections is related to the T-cell-mediated immune response restricted by class-I- or class-II-encoded proteins. Thus, the above-mentioned HLA-DR2-related susceptibility to certain viral infections could be associated with a preferential induction of an increased (although ineffective) antibody synthesis against viral antigens.

  17. Individual and Population Trajectories of Influenza Antibody Titers Over Multiple Seasons in a Tropical Country.

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    Zhao, Xiahong; Ning, Yilin; Chen, Mark I-Cheng; Cook, Alex R

    2018-01-01

    Seasonal influenza epidemics occur year-round in the tropics, complicating the planning of vaccination programs. We built an individual-level longitudinal model of baseline antibody levels, time of infection, and the subsequent rise and decay of antibodies postinfection using influenza A(H1N1)pdm09 data from 2 sources in Singapore: 1) a noncommunity cohort with real-time polymerase chain reaction-confirmed infections and at least 1 serological sample collected from each participant between May and October 2009 (n = 118) and 2) a community cohort with up to 6 serological samples collected between May 2009 and October 2010 (n = 760). The model was hierarchical, to account for interval censoring and interindividual variation. Model parameters were estimated via a reversible jump Markov chain Monte Carlo algorithm using custom-designed R (https://www.r-project.org/) and C++ (https://isocpp.org/) code. After infection, antibody levels peaked at 4-7 weeks, with a half-life of 26.5 weeks, followed by a slower decrease up to 1 year to approximately preinfection levels. After the third wave, the seropositivity rate and the population-level antibody titer dropped to the same level as they were at the end of the first pandemic wave. The results of this analysis are consistent with the hypothesis that the population-level effect of individuals' waxing and waning antibodies influences influenza seasonality in the tropics. © The Author(s) 2017. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health.

  18. Comparison of antibody titers using conventional tube technique versus column agglutination technique in ABO blood group incompatible renal transplant.

    Science.gov (United States)

    Bhangale, Amit; Pathak, Amardeep; Pawar, Smita; Jeloka, Tarun

    2017-01-01

    Measurement of alloantibody titer to a red cell antigen (ABO titers) is an integral part of management of ABO incompatible kidney transplants (ABOiKT). There are different methods of titer estimation. Alloantibody detection by tube titration and Gel agglutination columns are accepted methodologies. It is essential to find the difference in titers between the two methods so as to set the 'cut-off' titer accordingly, depending upon the method used. We did a prospective observational study to compare and correlate the ABO titers using these two different techniques - conventional tube technique (CTT) and the newer column agglutination technique (CAT). A total of 67 samples were processed in parallel for anti-A/B antibodies by both tube dilution and column agglutination methods. The mean titer by conventional tube method was 38.5 + 96.6 and by the column agglutination test was 96.4 + 225. The samples correlated well with Spearman rho correlation coefficient of 0.94 (P = 0.01). The column agglutination method for anti A/B titer estimation in an ABO incompatible kidney transplant is more sensitive, with the column agglutination results being approximately two and half fold higher (one more dilution) than that of tube method.

  19. Comparison of antibody titers using conventional tube technique versus column agglutination technique in ABO blood group incompatible renal transplant

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    Amit Bhangale

    2017-01-01

    Full Text Available Introduction: Measurement of alloantibody titer to a red cell antigen (ABO titers is an integral part of management of ABO incompatible kidney transplants (ABOiKT. Material and Methods: There are different methods of titer estimation. Alloantibody detection by tube titration and Gel agglutination columns are accepted methodologies. It is essential to find the difference in titers between the two methods so as to set the 'cut-off' titer accordingly, depending upon the method used. Results: We did a prospective observational study to compare and correlate the ABO titers using these two different techniques – conventional tube technique (CTT and the newer column agglutination technique (CAT. A total of 67 samples were processed in parallel for anti-A/B antibodies by both tube dilution and column agglutination methods. The mean titer by conventional tube method was 38.5 + 96.6 and by the column agglutination test was 96.4 + 225. The samples correlated well with Spearman rho correlation coefficient of 0.94 (P = 0.01. Conclusion: The column agglutination method for anti A/B titer estimation in an ABO incompatible kidney transplant is more sensitive, with the column agglutination results being approximately two and half fold higher (one more dilution than that of tube method.

  20. Natural prevalence of antibody titers to Glucostltransferase of Streptococcus mutans in serum in high and low caries active children

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    Kirtaniya B

    2010-06-01

    Full Text Available In this investigation, serum immunoglobulin G (IgG and immunoglobulin A (IgA titers, as well as total immunoglobulin concentration (IgG + IgA + IgM, were found to be raised with the increase in the number of dental caries. Only the total serum antibody titer in high dental caries (HDC group was found to be significantly raised as compared to no dental carries (NDC group. Although the IgG and IgA titers were raised in blood with the increased number of caries, the results were not statistically significant. However, we could not find any correlation between serum antibodies and dental caries except that there was an increased trend of serum antibodies to GTF with the increased number of carious lesions.

  1. A chimeric Plasmodium falciparum merozoite surface protein vaccine induces high titers of parasite growth inhibitory antibodies.

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    Alaro, James R; Partridge, Andrea; Miura, Kazutoyo; Diouf, Ababacar; Lopez, Ana M; Angov, Evelina; Long, Carole A; Burns, James M

    2013-10-01

    The C-terminal 19-kDa domain of Plasmodium falciparum merozoite surface protein 1 (PfMSP119) is an established target of protective antibodies. However, clinical trials of PfMSP142, a leading blood-stage vaccine candidate which contains the protective epitopes of PfMSP119, revealed suboptimal immunogenicity and efficacy. Based on proof-of-concept studies in the Plasmodium yoelii murine model, we produced a chimeric vaccine antigen containing recombinant PfMSP119 (rPfMSP119) fused to the N terminus of P. falciparum merozoite surface protein 8 that lacked its low-complexity Asn/Asp-rich domain, rPfMSP8 (ΔAsn/Asp). Immunization of mice with the chimeric rPfMSP1/8 vaccine elicited strong T cell responses to conserved epitopes associated with the rPfMSP8 (ΔAsn/Asp) fusion partner. While specific for PfMSP8, this T cell response was adequate to provide help for the production of high titers of antibodies to both PfMSP119 and rPfMSP8 (ΔAsn/Asp) components. This occurred with formulations adjuvanted with either Quil A or with Montanide ISA 720 plus CpG oligodeoxynucleotide (ODN) and was observed in both inbred and outbred strains of mice. PfMSP1/8-induced antibodies were highly reactive with two major alleles of PfMSP119 (FVO and 3D7). Of particular interest, immunization with PfMSP1/8 elicited higher titers of PfMSP119-specific antibodies than a combined formulation of rPfMSP142 and rPfMSP8 (ΔAsn/Asp). As a measure of functionality, PfMSP1/8-specific rabbit IgG was shown to potently inhibit the in vitro growth of blood-stage parasites of the FVO and 3D7 strains of P. falciparum. These data support the further testing and evaluation of this chimeric PfMSP1/8 antigen as a component of a multivalent vaccine for P. falciparum malaria.

  2. Development of OMP based indirect ELISA to gauge the antibody titers in bovines against Pasteurella multocida

    Science.gov (United States)

    Dogra, V; Verma, S; Singh, G; Wani, A. H; Chahota, R; Dhar, P; Verma, L; Sharma, M

    2015-01-01

    Pasteurella multocida (P. multocida) is an important pathogen of various domestic animals. The outer membrane proteins (OMPs) play a major role in pathogenesis and immunogenicity of P. multocida. The aim of the study was to develop indirect enzyme linked immuno sorbant assay (ELISA) based on OMPs to ascertain the antibody titers in animals post-infection or to gauge the potency of vaccine. The OMPs were extracted and purified from P. multocida P:52 (vaccine strain) and P. multocida B:2 isolated from natural outbreak of Haemorrhagic septicaemia (HS) and analyzed on SDS PAGE and through western blot. The OMPs profile of the vaccine strain and the isolate from the natural outbreak of HS were found to be similar. Optimization of various components viz. coating antigens, anti-species conjugate, etc. were carried out against both anti-P. multocida hyper immune and pre immune serum. Validation of OMP based indirect ELISA assay to measure immune response against P. multocida in bovine revealed 91% diagnostic sensitivity (DSN) and about 100% diagnostic specificity (DSP) at 25% cut off. OMP based indirect ELISA was found to be more specific, but less sensitive as compared to WCL based assay. PMID:27175202

  3. Development of a Coxsackievirus A16 neutralization assay based on pseudoviruses for measurement of neutralizing antibody titer in human serum.

    Science.gov (United States)

    Jin, Jun; Ma, Hongxia; Xu, Lin; An, Dong; Sun, Shiyang; Huang, Xueyong; Kong, Wei; Jiang, Chunlai

    2013-02-01

    Serum neutralizing antibody titers are indicative of protective immunity against Coxsackievirus A16 (CV-A16) and Enterovirus 71 (EV71), the two main etiological agents of hand, foot and mouth disease (HFMD), and provide the basis for evaluating vaccine efficacy. The current CV-A16 neutralization assay based on inhibition of cytopathic effects requires manual microscopic examination, which is time-consuming and labor-intensive. In this study, a high-throughput neutralization assay was developed by employing CV-A16 pseudoviruses expressing luciferase for detecting infectivity in rhabdomyosarcoma (RD) cells and measuring serum viral neutralizing antibodies. Without the need to use infectious CV-A16 strains, the neutralizing antibody titer against CV-A16 could be determined within 15h by measuring luciferase signals by this assay. The pseudovirus CV-A16 neutralization assay (pCNA) was validated by comparison with a conventional CV-A16 neutralization assay (cCNA) in testing 174 human serum samples collected from children (age <5 years). The neutralizing antibody titers determined by these two assays were well correlated (R(2)=0.7689). These results suggest that the pCNA can serve as a rapid and objective procedure for the measurement of neutralizing antibodies against CV-A16. Copyright © 2012 Elsevier B.V. All rights reserved.

  4. Changes in hepatitis B virus antibody titers over time among children: a single center study from 2012 to 2015 in an urban of South Korea.

    Science.gov (United States)

    Lee, Kyeong Hun; Shim, Kyu Seok; Lim, In Seok; Chae, Soo Ahn; Yun, Sin Weon; Lee, Na Mi; Choi, Young Bae; Yi, Dae Yong

    2017-07-14

    Hepatitis B virus (HBV) infection is the most common cause of liver disease in endemic areas such as South Korea. After HBV vaccination, hepatitis B surface antibody (HBsAb) titers gradually decrease. Trends in HBsAb titers have not been evaluated among children in South Korea over the past decade. We screened 6155 patients (aged 7 months to 17 years) who underwent HBV antigen/antibody testing at Chung-Ang University Hospital from May 2012 to April 2015. Titer criteria were defined as follows: positive, titer ≥100 IU/L; weakly positive, titer 10-99 IU/L; and negative, titer <10 IU/L. We also compared titers before and 1 month after a single booster vaccination. Of the 5655 patients included, 3016 were male and 5 (0.09%) tested positive for HBV surface antigen. A marked reduction in antibody titer was observed until 4 years of age. Thereafter, the titers showed fluctuating decreases. HBsAb titers reached their lowest levels by 14 years of age. After 7 years of age, 50% of patients tested negative for HBsAb. Simple linear analysis showed that the titer reached levels of <10 IU/L and zero at 12.9 and 13.4 years of age, respectively. 1 month after a single booster vaccination was administered to those who were HBsAb-negative (n = 72), 69 children (96%) had developed antibodies while 3 (4%) remained HBsAb-negative. In conclusion, the continuous reduction in HBsAb titers over time and in each age group was confirmed. The titer level was shown significant decline until age 4. More than half of the sample had negative titers after age 7 years. After booster vaccination, most of child significantly increase titer level.

  5. Prevalence of protective antibody titers for canine distemper virus and canine parvovirus in dogs entering a Florida animal shelter.

    Science.gov (United States)

    Lechner, Elizabeth S; Crawford, P Cynda; Levy, Julie K; Edinboro, Charlotte H; Dubovi, Edward J; Caligiuri, Randy

    2010-06-15

    To determine the proportion of dogs entering an animal shelter with protective antibody titers (PATs) for canine distemper virus (CDV) and canine parvovirus (CPV) and identify factors associated with having a PAT. Cross-sectional study. 431 dogs admitted to an open-admission municipal animal shelter in north central Florida with a history of infectious disease outbreaks. Blood was collected from dogs on the day of admission to the shelter. Antibody titers for CDV and CPV were measured by virus neutralization and hemagglutination inhibition, respectively. Age, sex, neuter status, address of origin, source (stray or previously owned), health status (healthy or not healthy), and outcome (adoption, euthanasia, or reclaimed by owner) data were also collected. Overall, 64.5% (278/431) of dogs had insufficient titers for antibodies against CDV, CPV, or both. A total of 153 (35.5%) dogs had PATs for both CDV and CPV, 33 (7.7%) had PATs for CDV but not CPV, 136 (31.5%) had PATs for CPV but not CDV, and 109 (25.3%) did not have PATs for either virus. Older dogs were more likely to have PATs for CDV and CPV. Neutered dogs were more likely to have PATs for CDV. Factors not associated with having a PAT included source, health status, and type of community from which the dog originated. Most dogs had insufficient antibody titers for CDV, CPV, or both at the time of admission to the animal shelter. Findings support current guidelines recommending vaccination of all dogs immediately upon admission to shelters, regardless of source or physical condition.

  6. Enhanced neutralizing antibody titers and Th1 polarization from a novel Escherichia coli derived pandemic influenza vaccine.

    Directory of Open Access Journals (Sweden)

    David A G Skibinski

    Full Text Available Influenza pandemics can spread quickly and cost millions of lives; the 2009 H1N1 pandemic highlighted the shortfall in the current vaccine strategy and the need for an improved global response in terms of shortening the time required to manufacture the vaccine and increasing production capacity. Here we describe the pre-clinical assessment of a novel 2009 H1N1 pandemic influenza vaccine based on the E. coli-produced HA globular head domain covalently linked to virus-like particles derived from the bacteriophage Qβ. When formulated with alum adjuvant and used to immunize mice, dose finding studies found that a 10 µg dose of this vaccine (3.7 µg globular HA content induced antibody titers comparable to a 1.5 µg dose (0.7 µg globular HA content of the licensed 2009 H1N1 pandemic vaccine Panvax, and significantly reduced viral titers in the lung following challenge with 2009 H1N1 pandemic influenza A/California/07/2009 virus. While Panvax failed to induce marked T cell responses, the novel vaccine stimulated substantial antigen-specific interferon-γ production in splenocytes from immunized mice, alongside enhanced IgG2a antibody production. In ferrets the vaccine elicited neutralizing antibodies, and following challenge with influenza A/California/07/2009 virus reduced morbidity and lowered viral titers in nasal lavages.

  7. Considerable decrease of antibody titers against measles, mumps, and rubella in preschool children from an e-waste recycling area.

    Science.gov (United States)

    Lin, Yucong; Xu, Xijin; Dai, Yifeng; Zhang, Yuling; Li, Weiqiu; Huo, Xia

    2016-12-15

    Data on vaccination effects in children chronically exposed to heavy metals are extremely scarce. This study aims to investigate the immune responsiveness to measles, mumps, and rubella (MMR) vaccination in children from an e-waste recycling area. 378 healthy children from Guiyu (exposed group) and Haojiang (reference group) were surveyed. Blood lead (Pb) levels were measured by graphite furnace atomic absorption. Titers of antibodies against MMR were quantified by ELISA. Blood Pb levels of children from the exposed group were significantly higher than those from the reference group (5.61μg/dL vs. 3.57μg/dL, pcase of rubella, the median titer of the antibody was also significantly lower in the exposed group (median 37.08IU/mL, interquartile range 17.67-66.66IU/mL) compared to the reference group (median 66.50IU/mL, interquartile range 25.32-105.59IU/mL); the decrease in this case was nearly 44%. The proportion of children whose antibody titers against MMR were below protective level in the exposed group was higher than it was in the reference group. The present study demonstrates that the immune responsiveness to routine vaccination was suppressed in children chronically exposed to lead. Thus, the vaccination strategies for these children living in an e-waste recycling area should be modified. Copyright © 2016. Published by Elsevier B.V.

  8. Association between antinuclear antibody titers and connective tissue diseases in a Rheumatology Department.

    Science.gov (United States)

    Menor Almagro, Raúl; Rodríguez Gutiérrez, Juan Francisco; Martín-Martínez, María Auxiliadora; Rodríguez Valls, María José; Aranda Valera, Concepción; de la Iglesia Salgado, José Luís

    To determine the dilution titles at antinuclear antibodies (ANA) by indirect immunofluorescence observed in cell substrate HEp-2 and its association with the diagnosis of systemic connective tissue disease in ANA test requested by a Rheumatology Unit. Samples of patients attended for the first time in the rheumatology unit, without prior ANA test, between January 2010 and December 2012 were selected. The dilution titers, immunofluorescence patterns and antigen specificity were recorded. In January 2015 the diagnosis of the patients were evaluated and classified in systemic disease connective tissue (systemic lupus erythematosus, Sjögren's syndrome, systemic sclerosis, undifferentiated connective, antiphospholipid syndrome, mixed connective tissue and inflammatory myophaty) or not systemic disease connective tissue. A total of 1282 ANA tests requested by the Rheumatology Unit in subjects without previous study, 293 were positive, predominance of women (81.9%). Patients with systemic connective tissue disease were recorded 105, and 188 without systemic connective tissue disease. For 1/640 dilutions the positive predictive value in the connective was 73.3% compared to 26.6% of non-connective, and for values ≥1/1,280 85% versus 15% respectively. When performing the multivariate analysis we observed a positive association between 1/320 dilution OR 3.069 (95% CI: 1.237-7.614; P=.016), 1/640 OR 12.570 (95% CI: 3.659-43.187; P=.000) and ≥1/1,280 OR 42.136 (95% CI: 8.604-206.345; P=.000). These results show association titles dilution ≥1/320 in ANA's first test requested by a Rheumatology Unit with patients with systemic connective tissue disease. The VPP in these patients was higher than previous studies requested by other medical specialties. This may indicate the importance of application of the test in a targeted way. Copyright © 2016 Elsevier España, S.L.U. and Sociedad Española de Reumatología y Colegio Mexicano de Reumatología. All rights reserved.

  9. The Impact of Chemotherapy on Hepatitis B Antibody Titer in Patients with Hematological Malignancies

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    Münci Yağcı

    2015-09-01

    Full Text Available Objective: To investigate the influence of chemotherapy (CT on HBsAb titer in patients receiving CT due to hematological malignancy. Materials and Methods: The data of 75 patients who received CT with the diagnosis of various hematological malignancies and who had serum HBsAb levels measured prior to and after the cessation of CT were evaluated retrospectively. Results: The median age of the patients was 52 years (range: 16-78 with 49 (65% males and 26 (35% females. Median HBsAb titer decreased significantly after CT compared to the pre-CT median HBsAb titer [68 (range: 0-1000 vs. 100 (range: 6.2-1000] (p=0.001. In subgroup analysis, median HBsAb titer decreased significantly after CT in acute leukemia patients [110 (range: 6.2-1000 vs. 67.8 (range: 0-1000] (p=0.003 and in patients receiving intensive CT [97.2 (range: 6.2-1000 vs. 71 (range: 0-1000] (p=0.036. The decrease in median HBsAb titer was significant in male patients (p<0.001. HBsAb became negative after CT in 9 patients who were HBcAb-negative and had lower pre-CT HBsAb levels. Conclusion: HBsAb decreased after CT, especially in acute leukemia and male patients, and in patients receiving intensive CT.

  10. Measurement of serum antinuclear antibody titer in dogs with and without systemic lupus erythematosus: 120 cases (1997-2005).

    Science.gov (United States)

    Smee, Nicole M; Harkin, Kenneth R; Wilkerson, Melinda J

    2007-04-15

    To determine serum antinuclear antibody (ANA) titers in dogs with systemic lupus erythematosus (SLE) and in dogs with related clinical and clinicopathologic findings. Retrospective case series. 120 dogs. Information that was evaluated included signalment, clinical signs, results of routine laboratory testing, ANA titer, and diagnosis. The most common clinical signs were arthralgia, myalgia, and stiffness (n = 41 [34.2%]); the most common clinicopathologic abnormality was thrombocytopenia (30 [25%]). Serum ANA titer was seronegative) in 89 dogs (74.2%), 160 in 14 dogs (11.7%), 320 in 5 dogs (4.2%), and > or = 640 in 12 dogs (10%). Immune-mediated disease was confirmed in 40 dogs, 18 of which fulfilled the criteria for a definitive or probable diagnosis of SLE. Only 1 of 47 dogs with no major signs compatible with SLE had immune-mediated disease, compared with 26 of 57 dogs with 1 major sign and 13 of 16 dogs with > or = 2 major signs. Results suggested that measurement of ANA titer was not a useful diagnostic test in dogs without any major clinical or clinicopathologic abnormalities suggestive of SLE. In contrast, there was a good chance that results of the ANA assay would be positive and that the dog would be found to have immune-mediated disease if at least 2 major signs were evident. Findings suggest that it would be reasonable to limit the use of the ANA assay to those dogs that have at least 1 major sign compatible with a diagnosis of SLE.

  11. Decreased vaccine antibody titers following exposure to multiple metals and metalloids in e-waste-exposed preschool children.

    Science.gov (United States)

    Lin, Xinjiang; Xu, Xijin; Zeng, Xiang; Xu, Long; Zeng, Zhijun; Huo, Xia

    2017-01-01

    We explored acquired immunity resulting from vaccination in 3 to 7-year-old children, chronically exposed to multiple heavy metals and metalloids, in an e-waste recycling area (Guiyu, China). Child blood levels of ten heavy metals and metalloids, including lead (Pb), arsenic (As), mercury (Hg), chromium (Cr), cadmium (Cd), manganese (Mn), nickel (Ni), copper (Cu), zinc (Zn) and selenium (Se), and seven vaccine antibodies (diphtheria, pertussis, tetanus, hepatitis B, Japanese encephalitis, polio, measles) were measured. The exposed group had higher levels of blood Pb, Mn, Cu, Zn and Cr compared to the reference group (P 10 μg/dL) and high blood Cu and Zn (upper median value of each group) to be inversely associated with seven antibody titers. Antibody titers increased with age, BMI, high blood Mn (>15 μg/L), and high blood Cd and Ni (upper median value of each group). Results suggest multiple heavy metal and metalloid exposure, especially to Pb, Zn and Cu, may be a risk factor inhibiting the development of child immunity, resulting in decreased child antibody levels against vaccines. Copyright © 2016 Elsevier Ltd. All rights reserved.

  12. Apolipoprotein E-knockout mice show increased titers of serum anti-nuclear and anti-dsDNA antibodies

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Yuehai [Cardiovascular Department, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Huang, Ziyang, E-mail: huangziyang666@126.com [Cardiovascular Department, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Lu, Huixia [Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health, Shandong University, Qilu Hospital, Jinan, Shandong 250012 (China); Lin, Huili; Wang, Zhenhua [Cardiovascular Department, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Chen, Xiaoqing [Department of Rheumatism and Immunology, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Ouyang, Qiufang [Cardiovascular Department, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Tang, Mengxiong; Hao, Panpan [Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health, Shandong University, Qilu Hospital, Jinan, Shandong 250012 (China); Ni, Jingqin [Cardiovascular Department, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Xu, Dongming [Department of Rheumatism and Immunology, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); Zhang, Mingxiang; Zhang, Qunye [Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health, Shandong University, Qilu Hospital, Jinan, Shandong 250012 (China); Lin, Ling [Department of Rheumatism and Immunology, Second Clinical Medical College, Fujian Medical University, Quanzhou, Fujian 362000 (China); and others

    2012-07-13

    Highlights: Black-Right-Pointing-Pointer Titers of ANA and anti-dsDNA antibodies were higher in ApoE{sup -/-} than C57B6/L mice. Black-Right-Pointing-Pointer Spleen was greater and splenocyte apoptosis lower in ApoE{sup -/-} than B6 mice. Black-Right-Pointing-Pointer Level of TLR4 was lower in spleen tissue of ApoE{sup -/-} than B6 mice. Black-Right-Pointing-Pointer The TLR4 pathway may participate in maintaining the balance of splenocyte apoptosis. Black-Right-Pointing-Pointer The TLR4 pathway may participate in antibody production in spleen tissue. -- Abstract: Apolipoprotein E-knockout (ApoE{sup -/-}) mice, atherosclerosis-prone mice, show an autoimmune response, but the pathogenesis is not fully understood. We investigated the pathogenesis in female and male ApoE{sup -/-} mice. The spleens of all ApoE{sup -/-} and C57BL/6 (B6) mice were weighed. The serum IgG level and titers of anti-nuclear antibody (ANA) and anti-double-stranded DNA (anti-dsDNA) antibody were assayed by ELISA. Apoptosis of spleen tissue was evaluated by TUNEL. TLR4 level in spleen tissue was tested by immunohistochemistry and Western blot analysis. Levels of MyD88, p38, phosphorylated p38 (pp38), interferon regulatory factor 3 (IRF3) and Bcl-2-associated X protein (Bax) in spleen tissue were detected by Western blot analysis. We also survey the changes of serum autoantibodies, spleen weight, splenocyte apoptosis and the expressions of TLR4, MyD88, pp38, IRF3 and Bax in spleen tissue in male ApoE{sup -/-} mice after 4 weeks of lipopolysaccharide (LPS), Toll-like receptor 4 ligand, administration. ApoE{sup -/-} mice showed splenomegaly and significantly increased serum level of IgG and titers of ANA and anti-dsDNA antibody as compared with B6 mice. Splenocyte apoptosis and the expression of TLR4, MyD88, pp38, IRF3 and Bax in spleen tissue were significantly lower in ApoE{sup -/-} than B6 mice. The expression of TLR4, MyD88, IRF3, pp38, and Bax differed by sex in ApoE{sup -/-} spleen tissue. The

  13. Viral excretion and antibody titers in children infected with hepatitis A virus from an orphanage in western India.

    Science.gov (United States)

    Hundekar, Supriya; Thorat, Neeta; Gurav, Yogesh; Lole, Kavita

    2015-12-01

    Hepatitis A is endemic in India and mainly causes sporadic infections. However, children in childcare centers, schools and orphanages are vulnerable to common-source outbreaks as they have naive hosts. To investigate hepatitis A outbreak in an orphanage from Pune, India. Monitoring of virus excretion and anti-HAV antibody levels in hepatitis A virus (HAV) infected children. The orphanage housed 93 children of the age 1 month-6.5 years. Analysis of the collected serum (n=78) and stool samples (n=63) revealed 20 children to be either positive for anti-HAV IgM antibodies or excreting HAV, 14 being symptomatic and 6 asymptomatic, while 32 were already anti-HAV IgG positive either due to past HAV exposure (n=7, mean log antibody titers: 2.96) or maternal antibodies (n=25, mean log antibody titers: 1.13). Serum samples, taken 4 weeks apart, did not show any significant difference in the IgM and IgG antibody levels either. However, virus excretion decreased significantly after 15 days in symptomatic children (mean log HAV RNA copies/ml 1.03+0.30), while asymptomatic children continued to excrete higher viral loads, at constant levels (mean log HAV RNA copies/ml 2.33+0.33), for up to 90 days. Though virus excretion continued up to 90 days in all HAV infected children, asymptomatic children excreted higher viral loads for longer period and hence can contribute significantly in person-to-person virus transmission. All children should be vaccinated in such set ups. Copyright © 2015 Elsevier B.V. All rights reserved.

  14. Effects of body weight on antibody titers against canine parvovirus type 2, canine distemper virus, and canine adenovirus type 1 in vaccinated domestic adult dogs.

    Science.gov (United States)

    Taguchi, Masayuki; Namikawa, Kazuhiko; Maruo, Takuya; Saito, Miyoko; Lynch, Jonathan; Sahara, Hiroeki

    2012-10-01

    The objective of this study was to determine whether post-vaccination antibody titers vary according to body weight in adult dogs. Antibody titers against canine parvovirus type 2 (CPV-2), canine distemper virus (CDV), and canine adenovirus type 1 (CAdV-1) were measured for 978 domestic adult dogs from 2 to 6 y of age. The dogs had been vaccinated approximately 12 mo earlier with a commercial combination vaccine. The dogs were divided into groups according to their weight. It was found that mean antibody titers in all weight groups were sufficient to prevent infection. Intergroup comparison, however, revealed that CPV-2 antibody titers were significantly higher in the Super Light ( 20 kg) groups and were also significantly higher in the Light (5 to 9.9 kg) group than in the Heavy group. Antibody titers against CDV were significantly higher in the Super Light, Light, and Medium groups than in the Heavy group. There were no significant differences among the groups for the CAdV-1 antibody titers.

  15. Asymmetries in Chickens from Lines Selected and Relaxed for High or Low Antibody Titers to Sheep Red Blood Cells

    Directory of Open Access Journals (Sweden)

    Yunjie Tu

    2015-03-01

    Full Text Available Wattle length, width, and area were measured to classify bilateral asymmetries in four lines of chickens. The lines were the S26 generation of White Leghorns selected for high (HAS or low (LAS response to sheep red blood cells and sublines in which selection had been relaxed for three generations (high antibody relaxed [HAR] and low antibody relaxed [LAR]. Antibody titers (AB were greater for HAS than for HAR with both greater than for LAS and LAR which while different for males did not differ for females. The low antibody lines were heavier and reached sexual maturity at younger age than the high antibody lines. In general, wattle length, width, and area were greater in the low than high antibody lines. In 24 comparisons for bilaterality 18 exhibited fluctuating asymmetry and 6 exhibited directional asymmetry with 5 of the 6 being for wattle length. There was not a clear pattern for changes in degree of asymmetry when selection was relaxed for 3 generations. For females, the relative asymmetry (RA of wattle area was larger (p≤0.05 for HAR than for LAR and not different from the selected lines and relaxed lines. There were no differences among lines for RA of wattle length and width of females and wattle length, width, and area of males.

  16. Prevalence of serum antibody titers against canine distemper virus and canine parvovirus in dogs hospitalized in an intensive care unit.

    Science.gov (United States)

    Mahon, Jennifer L; Rozanski, Elizabeth A; Paul, April L

    2017-06-15

    OBJECTIVE To determine the prevalence of dogs hospitalized in an intensive care unit (ICU) with serum antibody titers against canine distemper virus (CDV) and canine parvovirus (CPV). DESIGN Prospective observational study. ANIMALS 80 dogs. PROCEDURES Dogs hospitalized in an ICU for > 12 hours between February 1 and June 1, 2015, that had at least 0.25 mL of serum left over from diagnostic testing were eligible for study inclusion. Dogs with serum antibody titers > 1:32 (as determined by serum neutralization) and > 1:80 (as determined by hemagglutination inhibition) were considered seropositive for CDV and CPV, respectively. The date of last vaccination was obtained from the medical record of each dog. RESULTS Of the 80 dogs, 40 (50%) and 65 (81%) dogs were seropositive for CDV and CPV, respectively. Of the 40 dogs that were seronegative for CDV, 27 had been vaccinated against CDV within 3 years prior to testing. Of the 15 dogs that were seronegative for CPV, 3 had been vaccinated against CPV within 3 years prior to testing. Ten dogs were seronegative for both CDV and CPV. CONCLUSIONS AND CLINICAL RELEVANCE Results indicated the prevalence of dogs hospitalized in an ICU that were seropositive for CDV and CPV was lower than expected given the high vaccination rate reported for dogs. Although the antibody titer necessary to prevent disease caused by CDV or CPV in critically ill dogs is unknown, adherence to infectious disease control guidelines is warranted when CDV- or CPV-infected dogs are treated in an ICU.

  17. Antibody titers against EBNA1 and EBNA2 in relation to Hodgkin lymphoma and history of infectious mononucleosis

    Science.gov (United States)

    Mueller, Nancy E.; Lennette, Evelyne T.; Dupnik, Kathryn; Birmann, Brenda M.

    2013-01-01

    A role for Epstein Barr virus (EBV) in Hodgkin lymphoma (HL) pathogenesis is supported by the detection of EBV genome in about one-third of HL cases, but is not well defined. We previously reported that an elevated pre-diagnosis antibody titer against EBV nuclear antigens (EBNA) was the strongest serologic predictor of subsequent HL. For the present analysis, we measured antibody levels against EBNA components EBNA1 and EBNA2 and computed their titer ratio (anti-EBNA1:2) in serum samples from HL cases and healthy siblings. We undertook this analysis to examine whether titer patterns atypical of well-resolved EBV infection, such as an anti-EBNA1:2 ratio ≤1.0, simply reflect history of infectious mononucleosis (IM), an HL risk factor, or independently predict HL risk. Participants were selected from a previous population-based case-control study according to their history of IM. We identified 55 EBV-seropositive persons with a history of IM (IM+; 33 HL cases, 22 siblings) and frequency-matched a comparison series of 173 IM history-negative, EBV-seropositive subjects on HL status, gender, age, and year of blood draw (IM−; 105 cases, 58 siblings). In multivariate logistic regression models, an anti-EBNA1:2 ratio ≤1.0 was significantly more prevalent in HL cases than siblings (odds ratio, 95% confidence interval=2.43, 1.05–5.65); similar associations were apparent within the IM+ and IM− groups. EBNA antibodies were not significantly associated with IM history in HL cases or siblings. These associations suggest that chronic or more severe EBV infection is a risk factor for HL, independent of IM history. PMID:21805472

  18. The beneficial effects of vitamin D3 on reducing antibody titers against Epstein-Barr virus in multiple sclerosis patients.

    Science.gov (United States)

    Najafipoor, Adeleh; Roghanian, Rasoul; Zarkesh-Esfahani, Sayyed Hamid; Bouzari, Majid; Etemadifar, Masoud

    2015-03-01

    Recently, the relationship between immunoreactivity to Epstein-Barr virus (EBV) and hypo-vitamin D in multiple sclerosis (MS) patients has been described. The aim of this study was to investigate whether vitamin D3 supplementation in MS patients could influence the immune response against latent EBV infection. Forty MS patients were recruited in this study. Twenty-seven patients were supplemented with 50,000 IU/week of vitamin D3 for 6 months and thirteen enrolled as controls. 25-Hydroxyvitamin D (25OHD) levels and IgG titers against EBNA1 and VCA were determined pre- and post-supplementation. All the patients were seropositive for EBV prior to vitamin D supplementation. In this cohort, 22.5% and 47.5% of the MS patients had deficient and insufficient levels of 25OHD, respectively. Our findings confirm that antibody titers against EBV in MS patients rise after the onset of the disease and indicate that vitamin D3 supplementation could limit augmentation of these titers in MS patients. Copyright © 2015 Elsevier Inc. All rights reserved.

  19. Effective vitamin B12 treatment can reduce serum antigastric parietal cell antibody titer in patients with oral mucosal disease.

    Science.gov (United States)

    Sun, Andy; Chang, Julia Yu-Fong; Wang, Yi-Ping; Cheng, Shih-Jung; Chen, Hsin-Ming; Chiang, Chun-Pin

    2016-10-01

    Patients with serum antigastric parietal cell antibody (GPCA) positivity may have vitamin B12 deficiency and some oral symptoms. This study assessed the changes of serum GPCA titer in GPCA-positive patients after effective vitamin B12 treatment. Two hundred and ten GPCA-positive oral mucosal disease patients became oral symptom free (complete response) after 1.0-67.1 months of treatment with regular and continuous intramuscular injection of vitamin B12 once per week. The changes of serum GPCA titers after treatment were evaluated in these 210 patients. We found a significant drop of the GPCA positive rate from 100% to 42.9% in our 210 complete response patients after effective vitamin B12 treatment (p vitamin BC capsules (containing 10 μg of vitamin B12) plus deficient hematinic supplements per day after a follow-up period of 2.7-27 months. A maintenance vitamin B12 treatment once a month could retain the GPCA-negative status in 87% of treated-to GPCA-negative patients compared with those (10%) without further maintenance vitamin B12 treatment. Regular and continuous effective vitamin B12 treatment can reduce the relatively higher serum GPCA titers to significantly lower or undetectable levels in GPCA-positive patients. Copyright © 2016. Published by Elsevier B.V.

  20. Respiratory syncytial virus-neutralizing serum antibody titers in infants following palivizumab prophylaxis with an abbreviated dosing regimen.

    Directory of Open Access Journals (Sweden)

    Jennifer Claydon

    Full Text Available Monthly injections of palivizumab during the respiratory syncytial virus (RSV season in at-risk infants reduces RSV-associated hospitalizations. However, the additive effect of naturally acquired immunity remains unclear. The objective of this study was to assess total neutralizing serum antibodies (NAb against RSV in at-risk infants who had received an abbreviated course of palivizumab prophylaxis.Serum samples were collected from infants enrolled in the RSV Immunoprophylaxis Program in British Columbia, Canada over 2 consecutive RSV seasons (2013 to 2015. Infants in this program had received an abbreviated course of palivizumab in accordance with the provincial guidelines. Data were compared to adults and infants less than 12 months of age who did not receive palivizumab. Anti-RSV NAb titers were measured using an RSV microneutralization assay.Infants who received palivizumab had anti-RSV NAb titers at the end of the RSV season that persisted beyond what is expected from the pharmacokinetics of palivizumab alone. Moreover, 54% of the control infants who did not receive palivizumab and all tested adults had protective anti-RSV NAb titers.Based on our observations, we hypothesize that naturally acquired NAb provide additive protection, which may significantly reduce the need for additional doses of palivizumab in infants at risk of severe RSV infections.

  1. Short report: Changes in West Nile virus seroprevalence and antibody titers among Wisconsin mesopredators 2003-2006

    Science.gov (United States)

    Docherty, D.E.; Samuel, M.D.; Egstad, K.F.; Griffin, K.M.; Nolden, C.A.; Karwal, L.; Ip, Hon S.

    2009-01-01

    After the 2001 occurrence of West Nile virus (WNV) in Wisconsin (WI), we collected sera, during 2003-2006, from south-central WI mesopredators. We tested these sera to determine WNV antibody prevalence and geometric mean antibody titer (GMAT). Four-fold higher antibody prevalence and 2-fold higher GMAT in 2003-2004 indicated greater exposure of mesopredators to WNV during the apparent epizootic phase. The period 2005-2006 was likely the enzootic phase because WNV antibody prevalence fell to a level similar to other flaviviruses. Our results suggest that, in mesopredators, vector-borne transmission is the primary route of infection and WNV antibodies persist for West Nile virus spill-over into humans and horses. Mesopredator sero-surveys may complement dead crow surveillance by providing additional data for the timing of public health interventions. Research is needed to clarify the dynamics of WNV infection in these mammals and their role as potential WNV amplifiers. Copyright ?? 2009 by The American Society of Tropical Medicine and Hygiene.

  2. Changes in the prevalence of the measles, rubella, varicella-zoster, and mumps virus antibody titers in Japanese pregnant women.

    Science.gov (United States)

    Hanaoka, Masachi; Hisano, Michi; Watanabe, Noriyoshi; Sugawara, Kana; Kambe, Yukari; Kanda, Eriko; Sago, Haruhiko; Kato, Tatsuo; Yamaguchi, Koushi

    2013-05-01

    In the present study, immunity against infectious diseases, which are capable of influencing both the mother and fetus during pregnancy and the infant in the postnatal period, were assessed in pregnant women to elucidate the necessity of vaccination during the childbearing age. It was determined that there was a trend of increases in the proportion of patients that had low antibody titers observed at a young age. Overall, after adjusting for age, low antibody titers of measles (≤ 4 via the neutralization test [NT]), rubella (≤ 16 via the hemagglutination inhibition [HI]), and varicella and mumps (plus minus or negative on the enzyme-linked immunosorbent assay [EIA]) indicated that the rates of necessity for vaccination against measles, rubella, varicella, and mumps were 27.6%, 16.1%, 3.9%, and 23.8%, respectively. In Japan, acquired immunity for measles, rubella, and mumps was dependent on vaccination, whereas acquired immunity for varicella was dependent on natural infection. We recommend that women be vaccinated after delivery, as these vaccines are live, and thereby, are contraindicated during pregnancy. Copyright © 2013 Elsevier Ltd. All rights reserved.

  3. Are children's vitamin D levels and BMI associated with antibody titers produced in response to 2014-2015 influenza vaccine?

    Science.gov (United States)

    Lin, Chyongchiou J; Martin, Judith M; Cole, Kelly Stefano; Zimmerman, Richard K; Susick, Michael; Moehling, Krissy K; Levine, Min Z; Spencer, Sarah; Flannery, Brendan; Nowalk, Mary Patricia

    2017-07-03

    Vitamin D is an immunomodulating hormone, which has been associated with susceptibility to infectious diseases. Serum vitamin D levels in 135 children ages 3-17 y were measured at baseline and hemagglutinin influenza antibody titers were measured pre- and 21 d post influenza vaccination with live attenuated influenza vaccine (LAIV) or inactivated influenza vaccine (IIV). Height and weight were derived from the electronic medical record and were used to calculate body mass index (BMI). Thirty-nine percent of children were ages 3-8 years; 75% were black, 34% were obese (BMI ≥ 95 th percentile); vitamin D levels were >20 ng/ml in 55%. In linear regression analyses, post vaccination antibody titers for LAIV B lineages (B Brisbane and B Massachusetts) were significantly higher among those with lower vitamin D levels and among younger participants (P vitamin D levels and responses to LAIV A strains (A/H1N1 and A/H3N2) or to any IIV strains or lineages were found. Low vitamin D levels were associated with higher response to LAIV B lineages in the 2014-2015 LAIV, but not related to LAIV A or any IIV strains.

  4. Toxigenic Corynebacterium ulcerans isolated from a hunting dog and its diphtheria toxin antibody titer.

    Science.gov (United States)

    Katsukawa, Chihiro; Komiya, Takako; Umeda, Kaoru; Goto, Minami; Yanai, Tokuma; Takahashi, Motohide; Yamamoto, Akihiko; Iwaki, Masaaki

    2016-03-01

    Toxigenic Corynebacterium ulcerans is a zoonotic pathogen that produces diphtheria toxin and causes a diphtheria-like illness in humans. The organism is known to infect and circulate among dogs, which can then transmit it to humans. Furthermore, previous studies have found that C. ulcerans is carried by wild animals, including game animals. In the present study, we tested hunting and companion dogs for the presence of toxigenic C. ulcerans and succeeded in isolating the bacterium from a hunting dog. Moreover, several hunting dogs had serum diphtheria antitoxin titers that were higher than the titers required for protection in humans, suggesting a history of exposure to toxigenic Corynebacterium strains. Notably, ribotyping, pulsed-field gel electrophoresis and tox gene sequencing demonstrated that the isolate from the hunting dog clustered with previously characterized C. ulcerans strains isolated from wild animals, as opposed to groups of isolates from humans and companion dogs. Interestingly, the wild animal cluster also contains an isolate from an outdoor breeding dog, which could have formed a bridge between isolates from wild animals and those from companion dogs. The results presented herein provide insight into the mechanism by which the zoonotic pathogen C. ulcerans circulates among wild animals, hunting and companion dogs, and humans. © 2016 The Societies and John Wiley & Sons Australia, Ltd.

  5. Component Analysis of Sweet BV and Clinical Trial on Antibody Titer and Allergic Reactions

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    Ki Rok, Kwon

    2006-06-01

    Full Text Available Objectives : The aim of this study was to observe prevention of allergic reactions of Sweet Bee Venom (removing enzyme components from Bee Venom. Methods : Content analysis of Sweet Bee Venom and Bee Venom was rendered using HPLC method and characterization of Anti-Sweet Bee Venom in Rabbit Serum. Clinical observation was conducted for inducement of allergic responses to Sweet BV. Results : 1. Analyzing melittin content using HPLC, Sweet BV contained 34.9% more melittin than Bee venom pharmacopuncture at same concentration. 2. Observing chromatogram of HPLC, removal of the enzyme was successfully rendered on Sweet BV. 3. The anti-serum of Sweet BV showed high titers against melittin and bee venom and relatively low titer against phospholipase A2. 4. After conducting approximately 3,000 cases of Sweet BV administration, not a single case of generalized anaphylatic reaction occurred in clinical observation. 5. Mild compared to the bee venom pharmacopuncture, Sweet BV showed some acute hypersensitive reactions of edema, itchiness, and aching locally. 6. Sweet BV was administered on six patients with previous history of suffering from generalized acute hypersensitive reactions with the bee venom. None of the patients showed allergic reactions with Sweet BV, suggesting it can effectively prevent anaphylatic shock which may occur after the bee venom pharmacopuncture procedure. Conclusion : Summarizing above results, Sweet Bee Venom appears to be an effective measurement against allergic reactions from the bee venom pharmacopuncture especially against anaphylatic shock.

  6. Frequency of vascular and pregnancy morbidity in patients with low vs. moderate-to-high titers of antiphospholipid antibodies.

    Science.gov (United States)

    Ofer-Shiber, Shachaf; Molad, Yair

    2015-04-01

    Antiphospholipid syndrome (APLS) is an autoimmune hypercoagulable syndrome characterized by thrombotic and obstetric manifestations. We sought to determine the rate of APLS feature in patients tested positive for antiphospholipid antibodies (APLA) regardless of the serum level of anticardiolipin (ACL) and/or anti-β2-glycoprotein I (β2GPI) antibodies. An inception cohort of individuals who were tested positive for ACL and/or β2GPI IgG/IgM antibody, and/or lupus anticoagulant (LAC) on two occasions of at least 12 weeks apart. A total of 243 patients were included; their mean age was 40.1 ± 15.9 years. Thrombotic vascular events occurred in 118 patients (48.5%) of the entire cohort, of which 62 patients (25.5%) suffered from an arterial event and 56 patients (23%) from thrombotic venous events. Obstetrical morbidity occurred in 106 female patients (43.6%). In our cohort, we found no difference in the frequency of thrombotic or obstetric manifestations of APLS between patients with ACL IgG/IgM of low serum antibody level (20 U). We suggest that in 'real life' the diagnosis of APLS should not be excluded because of low titer of APLA.

  7. Application of calcium phosphate flocculation in high-density cell culture fluid with high product titer of monoclonal antibody.

    Science.gov (United States)

    Chen, Guoqiang; Su, Zhiguo; Li, Feng; Liu, Hui Fang

    2017-05-01

    The calcium phosphate [Ca3(PO4)2] precipitation was used for improving the clarification efficiency in harvest process of the monoclonal antibody (mAb) containing cell culture fluid (CCF) with high turbidity and product titer. The flocculation conditions (concentration, addition order of flocculants, pH, and operation time), and the effect of flocculants on the mAb physical chemical properties (such as distribution of charge variants and aggregates) and process-related impurities removal (such as DNA and CHOP) were evaluated in this study. The results showed that the turbidity of CCF supernatant was significantly reduced at pH 7, 120 min with addition of phosphate ions first, while a high mAb recovery yield was kept in the CCF supernatant after flocculation. Addition of calcium ions at 15-60 mM was sufficient for flocculation in this study. A relationship between turbidity/mAb recovery yield and the concentration of calcium ions was established. More than 85% DNA in the CCF were effectively removed by the addition of optimal concentration of flocculants. Flocculation process of Ca3(PO4)2 is an effective pretreatment method in purification processes of mAbs from the CCF with high turbidity and product titer.

  8. Assessment of serum antibody titers against canine distemper virus, canine adenovirus type II, and canine parvovirus in Alaskan sled dogs before and after a long-distance race.

    Science.gov (United States)

    Banse, Heidi E; McKenzie, Erica C; Nelson, Stuart; Hinchcliff, Kenneth W

    2008-06-01

    To determine serum antibody titers against canine distemper virus (CDV), canine adenovirus type II (CAV-2), and canine parvovirus (CPV) in trained sled dogs prior to and after completion of a long-distance race. Prospective cohort study. 195 Alaskan sled dogs (from 18 kennels) that participated in the 2006 Iditarod Trail Race. All 1,323 dogs participating in the race had been vaccinated against the 3 viruses at 19 to 286 days prior to initial blood sample collection (obtained within the month preceding the race). Within 12 hours of race completion, blood samples were collected from 195 dogs (convenience sample) and matched with each dog's prerace sample. Serum antibody titers (90% confidence intervals [CIs]) were determined via serum neutralization assays. After racing, geometric mean titers against CDV and CPV were significantly higher (2,495 [90% CI, 321 to 16,384] and 6,323 [90% CI, 512 to 32,768], respectively) than prerace values (82 [90% CI, 11 to 362] and 166 [90% CI, 32 to 1,024], respectively). Sixty-one of 194 (31.4%) dogs had > or = 4-fold increases in anti-CPV antibody titers after racing. Prerace serum antibody titers against CDV, CPV, and CAV-2 varied significantly by sled team but were not associated with time since vaccination. Postrace increases in serum anti-CDV and anti-CPV antibody titer might reflect exposure of dogs to these agents immediately before or during racing. Dogs had no clinical signs of CDV-, CAV-2-, or CPV-associated disease; therefore, the clinical importance of these titer changes is uncertain.

  9. Structural basis for immunization with postfusion respiratory syncytial virus fusion F glycoprotein (RSV F) to elicit high neutralizing antibody titers

    Energy Technology Data Exchange (ETDEWEB)

    Swanson, Kurt A.; Settembre, Ethan C.; Shaw, Christine A.; Dey, Antu K.; Rappuoli, Rino; Mandl, Christian W.; Dormitzer, Philip R.; Carfi, Andrea (Novartis)

    2012-02-07

    Respiratory syncytial virus (RSV), the main cause of infant bronchiolitis, remains a major unmet vaccine need despite more than 40 years of vaccine research. Vaccine candidates based on a chief RSV neutralization antigen, the fusion (F) glycoprotein, have foundered due to problems with stability, purity, reproducibility, and potency. Crystal structures of related parainfluenza F glycoproteins have revealed a large conformational change between the prefusion and postfusion states, suggesting that postfusion F antigens might not efficiently elicit neutralizing antibodies. We have generated a homogeneous, stable, and reproducible postfusion RSV F immunogen that elicits high titers of neutralizing antibodies in immunized animals. The 3.2-{angstrom} X-ray crystal structure of this substantially complete RSV F reveals important differences from homology-based structural models. Specifically, the RSV F crystal structure demonstrates the exposure of key neutralizing antibody binding sites on the surface of the postfusion RSV F trimer. This unanticipated structural feature explains the engineered RSV F antigen's efficiency as an immunogen. This work illustrates how structural-based antigen design can guide the rational optimization of candidate vaccine antigens.

  10. Epstein-Barr virus gp350-specific antibody titers and antibody-dependent cellular cytotoxic effector function in different groups of patients: a study using cloned gp350-expressing transfected human T cell targets.

    Science.gov (United States)

    Khyatti, M; Stefanescu, I; Blagdon, M; Menezes, J

    1994-12-01

    An NK cell activity-resistant human lymphoid T cell line (CEM-NKr) expressing the transfected Epstein-Barr virus (EBV) gp350 gene was used in membrane immunofluorescence (MIF) and antibody-dependent cellular cytotoxicity (ADCC) assays to analyze the gp350-specific humoral and ADCC responses in groups of EBV-seropositive persons. Results show that there is no correlation between gp350-specific ADCC-mediating antibody titers and MIF or EBV neutralizing antibody titers. For example, sera from patients in the acute phase of infectious mononucleosis, while positive by MIF assay or EBV neutralization test, were not reactive in the ADCC assay. Results also show that nasopharyngeal carcinoma (NPC) patients on MIF present high IgG titers against gp350 compared with healthy persons. Anti-gp350 IgA antibodies were detected in all groups tested; however, titers were highest in the NPC group.

  11. Changes in titers of antimitochondrial and antinuclear antibodies during the course of primary biliary cirrhosis.

    Science.gov (United States)

    Masuda, J; Omagari, K; Matsuo, I; Kinoshita, H; Sakimura, K; Hazama, H; Ohba, K; Isomoto, H; Murase, K; Murata, I; Kohno, S

    2001-02-01

    A case of primary biliary cirrhosis (PBC) in whom a complete biochemical (serum bilirubin, transaminases and alkaline phosphatase) remission was noted after combination treatment with ursodeoxycholic acid (UDCA) and corticosteroid is reported. The antimitochondrial antibody (AMA) detected by indirect immunofluorescence was initially positive, and the antinuclear antibody (ANA) was negative, but these two antibodies subsequently fluctuated independently (AMA-positive/ANA-negative, AMA-negative/ANA-negative, AMA-negative/ANA-positive, AMA-positive/ANA-positive, and again AMA-negative/ANA-positive) in spite of a lack of histopathological improvement in the liver after treatment. The clinical presentation in our case suggests that in some cases the diagnosis of PBC or so-called autoimmune cholangitis (AIC) might depend on the 'phase' of the same disease. Our results also suggest that detailed immunoreactive profiles against 2-oxo-acid dehydrogenase complex (2-OADC) enzymes by using immunoblotting, together with a serial histological examination, should provide more precise information for a diagnosis of PBC.

  12. Detection of antibody responses by using haemagglutination inhibiton test and the protection titer of avian influenza virus H5N1 subtype

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    Risa Indriani

    2004-10-01

    Full Text Available Study on the detection of antibody responses using haemagglutination inhibition (HI test and the protection titer to Avian influenza (AI virus H5N1 subtype local isolate has been conducted at the Research Institute for Veterinary Science (RIVS. A total number of 50 village chicken (10 chicken served as un-injected controls and 30 quail were injected intramuscularly with inactivated virus of AI H5N1 subtype local isolate. Serum samples were collected 3 weeks after injection and were tested using haemagglutination inhibition tests. The correlation between antibody titer and its protection to AI virus H5N1 local isolate were measured by challenging the birds with AI virus H5N1 local isolate The HI test was then used to determine field serum samples. A total number of 48 village chicken from three (3 Districts (Bekasi, Tangerang and Bogor and 96 quails from two (2 farms in District of Sukabumi which were all vaccinated with commercial AI adjuvant vaccine were sampled. The study revealed that village chicken and quails showed antibody responses after 3 weeks vaccination and that titer of ≥ 3 log 2 was able to protect chicken and quails when they were challenged with local isolate virus. Based on this result, village chicken field samples from Districts of Tangerang, Bekasi and Bogor showed antibody titer which will protect 50, 100 and 85% of the flocks respectively. While quail field samples from Farm I and Farm II in District of Sukabumi showed antibody titer which will protect 60-100% and 0-80% of the flocks respectively. It is concluded that the study has successfully measured antibody titer to AI virus H5N1 subtype which protect village chicken and quails from local isolate virus challenge so that the results will be used to analyze field serum samples after vaccination program to eradicate AI from Indonesia.

  13. A systematic review of anti-rotavirus serum IgA antibody titer as a potential correlate of rotavirus vaccine efficacy.

    Science.gov (United States)

    Patel, Manish; Glass, Roger I; Jiang, Baoming; Santosham, Mathuram; Lopman, Ben; Parashar, Umesh

    2013-07-15

    Identifying an immunological correlate of protection for rotavirus vaccines (Rotarix [RV1] and RotaTeq [RV5]) would substantially facilitate testing of interventions for improving efficacy in developing countries and evaluating additional candidate rotavirus vaccines. We accessed PubMed and ClinicalTrials.gov to identify immunogenicity and efficacy trials for RV1 and RV5 to correlate anti-rotavirus serum immunoglobulin A (IgA) antibody titers vs efficacy in regions stratified by all-cause under-5 mortality rates (u5MR). We established a cutoff point for IgA geometric mean concentration or titer (GMC) that predicted lower efficacy and calculated pooled vaccine efficacy among countries with high vs low IgA titers. We observed an inverse correlation between u5MR and IgA titers for RV1 (r(2) = 0.72; P rotavirus IgA GMC 90 (85%; 95% CI, 82-88). We observed a significant correlation between IgA titers and rotavirus vaccine efficacy and hypothesize that a critical level of IgA antibody titer is associated with a sufficient level of sustained protection after rotavirus vaccination.

  14. Study on Anti-Hepatitis B Surface Antibody Titer and Specific Interferon Gamma Response Among Dentists

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    Manoochehr Makvandi

    2017-01-01

    Full Text Available Background Hepatitis B virus (HBV is a major problem for healthcare workers worldwide, and among them, dentists are at risk of acquiring HBV infection. The prevalence of HBV infection has been reported among the dentists in different regions of the world. Since none of the available drugs can clear HBV infection, the presence of effective immunity against HBV infection is important to prevent HBV infection. Objectives This study aimed at determining HBs antibody and specific HBV gamma interferon among the dentists, who received hepatitis B vaccine. Methods The blood samples were collected from 40 dentists, including 7 endodontics, 2 oral and maxillofacial radiologist, 4 periodontics, 11 oral and maxillofacial surgeons, 6 implantologists, 3 orthodontics, 1 oral and maxillofacial pathologist, 2 esthetic and restorative dentists, and 4 doctors of dental surgery (DDS at from dental college of Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran during December, 2013. Overall, 31 (77.5% dentists had already received 3 doses of recombinant hepatitis B vaccine, and 9 (22.5% had received only two doses of the vaccine. Their sera were tested for HBsAb and anti-HBc-IgG by the Enzyme Linked Immunosorbent Assay (ELISA test. The lymphocyte of individuals was separated from their blood sample by Ficoll-Hypaque, cells were washed with phosphate buffered saline (PBS by centrifugation, and finally the pellet cells was resuspended in RPMI-1640 media. Separated cells were exposed to 2.5 µg of purified recombinant HBs antigen, and supernatants were collected after 72 hours and tested for detection of specific interferon γ level by ELISA test. Results Overall, 97.5% of dentists showed positive HBs antibody test results while 36 showed (90% positive test results for specific interferon γ against hepatitis B virus infection. Conclusions High coverage of 97.5% immune response against hepatitis B infection was found, indicating high efficacy of recombinant

  15. Short duration of neutralizing antibody titers after pre-exposure rabies vaccination with suckling mouse brain vaccine

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    Zanetti C.R.

    1998-01-01

    Full Text Available The human anti-rabies pre-exposure treatment currently used in Brazil, employing a 1-ml dose of suckling mouse brain vaccine (SMBV administered on days 0, 2, 4 and 28, was compared to an alternative treatment with two 1 ml-doses on day 0, and one 1 ml-dose injected on days 7 and 21. The latter induced higher virus-neutralizing antibody (VNA titers on day 21. Both Brazilian rabies vaccines produced with PV or CVS rabies virus strains were tested. Two additional volunteer vaccinee groups, receiving the pre-exposure and the abbreviated post-exposure schedules recommended by the WHO using cell-culture vaccine (CCV produced with PM rabies virus strain, were included as reference. The VNA were measured against both PV and CVS strains on days 21, 42 and 180 by the cell-culture neutralization microtest. The PV-SMBV elicited higher seroconversion rates and VNA by day 21 than the CVS-SMBV. Both, however, failed to induce a long-term immunity, since VNA titers were <0.5 IU/ml on day 180, regardless of the schedule used. Cell-culture vaccine always elicited very high VNA on all days of collection. When serum samples from people receiving mouse brain tissue were titrated against the PV and CVS strains, the VNA obtained were similar, regardless of the vaccinal strain and the virus used in the neutralization test. These results contrast with those obtained with sera from people receiving PM-CCV, whose VNA were significantly higher when tested against the CVS strain.

  16. Expression of Blf1-Stx B Gene Cassette in E. coli and Investigation Antibody Titer in Mice

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    Mehdi Masoudi Kerahroudi

    2017-02-01

    Full Text Available Background and Objectives: One of the ways to strengthen the effect of vaccines is using the adjuvant. STxB has a carrier and adjuvant role that we can fuse it with vaccine candidate antigens and produce efficient vaccines. BLF1 has a role in the pathogenesis and infection by Burkholderia pseudomallei, that can be studied when fused with stxB.The aim of this study expression blf1-stxB gene Cassette in E. coli and antibody production in mice. Methods:In this study the synthetic gene in pUC57 plasmid was purchased from Nedaye Fan COR. pUC57 plasmid containing blf1 with BamHI , SalI restriction enzyme sites was subcloned in pET28a(+-stxB expression vector and transformed into E. coli BL21 DE3. expression blf1-stxB gene Cassette was induced by IPTG. After extraction by affinity chromatography, the recombinant protein was injected four times to mice. Results: In this study, blf1-StxB cloned gene in pET28a(+ expression vector was approved by PCR and enzymatic analysis. Also recombinant protein confirmed by SDS-PAGE and Western blotting. Then antibody produced from the mice serum, were isolated and confirmed by ELISA. Conclusion: Given that BLF1 protein has the ability to stop protein synthesis and STxB has a carrier and adjuvant role, also with respect to antibody titers produced, it’s as a vaccine candidate against B. pseudomallei and Shigella dysenteriae.

  17. Risk factors for high anti-HHV-8 antibody titers (≥1:51,200 in black, HIV-1 negative South African cancer patients: a case control study

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    Ruff Paul

    2003-09-01

    Full Text Available Abstract Background Infection with human herpesvirus 8 (HHV-8, also known as Kaposi's sarcoma-associated herpesvirus (KSHV, is the necessary causal agent in the development of Kaposi's sarcoma (KS. Infection with HIV-1, male gender and older age all increase risk for KS. However, the geographic distribution of HHV-8 and KS both prior to the HIV/AIDS epidemic and with HIV/AIDS suggest the presence of an additional co-factor in the development of KS. Methods Between January 1994 and October 1997, we interviewed 2576 black in-patients with cancer in Johannesburg and Soweto, South Africa. Blood was tested for antibodies against HIV-1 and HHV-8 and the study was restricted to 2191 HIV-1 negative patients. Antibodies against the latent nuclear antigen of HHV-8 encoded by orf73 were detected with an indirect immunofluorescence assay. We examined the relationship between high anti-HHV-8 antibody titers (≥1:51,200 and sociodemographic and behavioral factors using unconditional logistic regression models. Variables that were significant at p = 0.10 were included in multivariate analysis. Results Of the 2191 HIV-1 negative patients who did not have Kaposi's sarcoma, 854 (39.0% were positive for antibodies against HHV-8 according to the immunofluorescent assay. Among those seropositive for HHV-8, 530 (62.1% had low titers (1:200, 227 (26.6% had medium titers (1:51,200 and 97 (11.4% had highest titers (1:204,800. Among the 2191 HIV-1 negative patients, the prevalence of high anti-HHV-8 antibody titers (≥1:51,200 was independently associated with increasing age (ptrend = 0.04, having a marital status of separated or divorced (p = 0.003, using wood, coal or charcoal as fuel for cooking 20 years ago instead of electricity (p = 0.02 and consuming traditional maize beer more than one time a week (p = 0.02; p-trend for increasing consumption = 0.05 although this may be due to chance given the large number of predictors considered in this analysis. Conclusions

  18. Successful reduction of high-sustained anti-idursulfase antibody titers by immune modulation therapy in a patient with severe mucopolysaccharidosis type II

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    Katherine H. Kim

    2015-03-01

    Full Text Available We report on a 6 year old boy with severe MPS II undergoing immune modulation therapy due to high IgG antibody titers to IV idursulfase and no significant decline in urinary GAG levels since initiating enzyme replacement therapy. He has complete deficiency of iduronate-2-sulfatase activity due to a submicroscopic deletion of the X chromosome involving the entire I2S gene but not including in the fragile X locus. At 19 months of age, IV idursulfase therapy at the recommended dose of 0.5 mg/kg/week was initiated and then increased to 1.0 mg/kg/week after no observed clinical improvement and no decline in urine GAG level. After one year of ERT at the increased dose, he had no significant decline in urinary GAG excretion and increase of anti-idursulfase IgG antibody titers to 102,000 with complete neutralizing antibodies. In light of the evidence of lack of efficacy of idursulfase therapy, the patient was started on an immune modulation regimen consisting of ofatumumab, bortezomib, methotrexate and IVIG for a 12 week period. Only a slight decrease in IgG titers and urine GAG levels was observed, leading to increased intensity of bortezomib administration and addition of dexamethasone to the regimen, while continuing with the current schedule ofatumumab, IVIG and methotrexate. Over 18 month period of immune modulation therapy, we observed a significant reduction in anti-idursulfase IgG titers and a moderate reduction in urine GAG levels compared to baseline. Modest clinical improvements were observed. Our experience suggests that future MPS II patients with a complete gene deletion may be likely to develop persistent anti-idursulfase antibody titers and may benefit from immune modulation therapy prior to the development of high titer levels.

  19. TSH receptor antibody titers measured with a third-generation assay did not reflect the activity of Graves' ophthalmopathy in untreated Japanese Graves' disease patients.

    Science.gov (United States)

    Mukasa, Koji; Yoshimura Noh, Jaeduk; Kouzaki, Ai; Ohye, Hidemi; Kunii, Yo; Watanabe, Natsuko; Yoshihara, Ai; Matsumoto, Masako; Suzuki, Miho; Ito, Koichi

    2016-01-01

    TSH receptor antibody (TRAb) titer has been reported to be correlated with Graves' ophthalmopathy (GO). However, the correlation between GO activity and TRAb titer assessed with a third-generation assay has not been reported. We enrolled 238 untreated Graves' disease patients who came to the outpatient clinic of Ito Hospital and 28 patients who were euthyroid. All of the patients were assessed for GO by an ophthalmologist within 3 months of their initial visit to Ito Hospital. Clinical activity score (CAS), short inversion time inversion recovery (STIR), and sum of the maximum external orbital muscle areas (SEOMA) on a frontal sectional magnetic resonance imaging (MRI). The TRAb titer was significantly higher in patients with inactive ophthalmopathy (the inactive-GO group) than in patients with active ophthalmopathy (the active-GO group) (17.7 ± 13.5 IU/L vs. 13.0 ± 13.1 IU/L, p=0.0082). The SEOMA values were not correlated with TRAb titer. The prevalence of active-GO was higher in euthyroid patients than in hyperthyroid patients although the difference was not significant. In conclusion, TRAb titer measured with a third-generation assay dose not correlate with GO activity based on MRI findings in untreated Graves' disease patients, and the prevalence of active-GO is higher in euthyroid patients with lower TRAb titers than in hyperthyroid patients.

  20. CHO-S antibody titers >1 gram/liter using flow electroporation-mediated transient gene expression followed by rapid migration to high-yield stable cell lines.

    Science.gov (United States)

    Steger, Krista; Brady, James; Wang, Weili; Duskin, Meg; Donato, Karen; Peshwa, Madhusudan

    2015-04-01

    In recent years, researchers have turned to transient gene expression (TGE) as an alternative to CHO stable cell line generation for early-stage antibody development. Despite advances in transfection methods and culture optimization, the majority of CHO-based TGE systems produce insufficient antibody titers for extensive use within biotherapeutic development pipelines. Flow electroporation using the MaxCyte STX Scalable Transfection System is a highly efficient, scalable means of CHO-based TGE for gram-level production of antibodies without the need for specialized expression vectors or genetically engineered CHO cell lines. CHO cell flow electroporation is easily scaled from milligram to multigram quantities without protocol reoptimization while maintaining transfection performance and antibody productivity. In this article, data are presented that demonstrate the reproducibility, scalability, and antibody production capabilities of CHO-based TGE using the MaxCyte STX. Data show optimization of posttransfection parameters such as cell density, media composition, and feed strategy that result in secreted antibody titers >1 g/L and production of multiple grams of antibody within 2 weeks of a single CHO-S cell transfection. In addition, data are presented to demonstrate the application of scalable electroporation for the rapid generation of high-yield stable CHO cell lines to bridge the gap between early- and late-stage antibody development activities. © 2014 Society for Laboratory Automation and Screening.

  1. Analysis of specific IgG titers against tick-borne encephalitis in patients with primary antibody deficiency under immunoglobulin substitution therapy: impact of plasma donor origin.

    Science.gov (United States)

    Goldacker, Sigune; Witte, Torsten; Huzly, Daniela; Schlesier, Michael; Peter, Hans-Hartmut; Warnatz, Klaus

    2014-01-01

    Immunoglobulin (Ig) replacement therapy is effective in reducing infections in patients with primary antibody deficiency (PAD). Diversity of specific antibodies is achieved by pooling plasma from over 1000 donors usually of a given geographic region. However, there is no agreement with regard to an optimal vaccination schedule for plasma donors. Especially for tick-borne encephalitis (TBE), regional vaccination rates differ widely among populations due to the epidemiology of the disease. We analyzed specific antibody titers against TBE in comparison to total IgG levels in 162 serum samples collected from 110 PAD patients substituted with polyvalent intravenous IgG or subcutaneous IgG. Some patients received different IgG products over time leading to a total number of 122 different patient-IgG product combinations. Positive TBE-specific IgG levels were detected in 35 cases when measured by standard ELISA and could be confirmed by demonstration of neutralizing antibodies in 31 cases. The detection of specific antibody levels correlated with the geographic origin of the IgG preparations. No titers were detectable in patients substituted with IgG products from North-American donors, whereas variable degrees of anti-TBE titers were observed in patients receiving products from different European countries. We suggest considering the patients' personal risk for TBE when selecting an appropriate Ig preparation. These data support regional plasma donation in order to address the diverse local infection profile.

  2. Evaluation of high-capacity cation exchange chromatography for direct capture of monoclonal antibodies from high-titer cell culture processes.

    Science.gov (United States)

    Tao, Yinying; Ibraheem, Aladein; Conley, Lynn; Cecchini, Douglas; Ghose, Sanchayita

    2014-07-01

    Advances in molecular biology and cell culture technology have led to monoclonal antibody titers in excess of 10 g/L. Such an increase can pose concern to traditional antibody purification processes due to limitations in column hardware and binding capacity of Protein A resins. Recent development of high capacity cation exchangers can make cation exchange chromatography (CEX) a promising and economic alternative to Protein A capture. This work investigates the feasibility of using CEX for direct capture of monoclonal antibodies from high titer cell culture fluids. Two resin candidates were selected from seven newer generation cation exchangers for their higher binding capacity and selectivity. Two monoclonal antibodies with widely differing pI values were used to evaluate the capability of CEX as a platform capture step. Screening of loading pH and conductivity showed both resins to be capable of directly capturing both antibodies from undiluted cell culture fluid. At appropriate acidic pH range, product loading of over 65 g/L resin was achieved for both antibodies. A systematic design of experiment (DOE) approach was used to optimize the elution conditions for the CEX step. Elution pH showed the most significant impact on clearance of host cell proteins (HCPs). Under optimal conditions, HCP reduction factors in the range of 9-44 were achieved on the CEX step based on the pI of the antibody. Apart from comparing CEX directly to Protein A as the capture method, material from either modality was also processed through the subsequent polishing steps to compare product quality at the drug substance level. Process performance and product quality was found to be acceptable using the non-affinity based process scheme. The results shown here present a cheaper and higher capacity generic capture method for high-titer antibody processes. © 2014 Wiley Periodicals, Inc.

  3. Lack of correlation between serum rotavirus antibody titers and protection following vaccination with reassortant RRV vaccines. US Rotavirus Vaccine Efficacy Group.

    Science.gov (United States)

    Ward, R L; Bernstein, D I

    1995-09-01

    In a large placebo-controlled efficacy trial of the rhesus tetravalent (RRV-TV) and serotype 1 monovalent (RRV-S1) rotavirus vaccines in multiple sites throughout the United States, protection against rotavirus disease over a 2-year period was found to be 57 and 40%, respectively (Bernstein et al., J. Am. Med. Assoc., 1995, 273, 1191-1196). Sera collected from a subset of subjects during this trial were used to determine possible correlations between rotavirus antibody responses after vaccination and protection. Between 82% (RRV-S1) and 92% (RRV-TV) of the vaccinees seroconverted by at least one of the six antibody assays performed (i.e. rotavirus IgA and neutralizing antibody to RRV and serotype 1-4 human rotaviruses). Rises in neutralizing antibody were due primarily to RRV. The seroconversion rate was only 18-22% to each of the four human rotavirus serotypes following RRV-TV vaccination and was only 43% to serotype 1 human rotavirus after RRV-S1 administration. Furthermore, no correlate of immunity against rotavirus infection or disease was identifiable based on seroconversion to any of the antibodies measured. Likewise, no consistent relationship was found between the titers of any of these six antibodies following vaccination and protection against rotavirus, thus suggesting that serum antibody titers will not be useful markers of protection with these reassortant RRV vaccines. In addition, vaccinated subjects did not develop higher titers of neutralizing antibody to human rotaviruses following a subsequent natural rotavirus illness, a further indication that only weak immune responses to human rotaviruses were stimulated by vaccination with the RRV reassortants.(ABSTRACT TRUNCATED AT 250 WORDS)

  4. Evolution of anti-Trypanosoma cruzi antibody production in patients with chronic Chagas disease: Correlation between antibody titers and development of cardiac disease severity.

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    Ingebourg Georg

    2017-07-01

    Full Text Available Chagas disease is one of the most important endemic infections in Latin America affecting around 6-7 million people. About 30-50% of patients develop the cardiac form of the disease, which can lead to severe cardiac dysfunction and death. In this scenario, the identification of immunological markers of disease progression would be a valuable tool for early treatment and reduction of death rates. In this observational study, the production of anti-Trypanosoma cruzi antibodies through a retrospective longitudinal follow-up in chronic Chagas disease patients´ cohort and its correlation with disease progression and heart commitment was evaluated. Strong inverse correlation (ρ = -0.6375, p = 0.0005 between anti-T. cruzi IgG1 titers and left ventricular ejection fraction (LVEF in chronic Chagas cardiomyopathy (CCC patients were observed after disease progression. Elevated levels of anti-T. cruzi IgG3 titers were detected in all T. cruzi-infected patients, indicating a lack of correlation of this IgG isotype with disease progression. Furthermore, low levels of anti-T. cruzi IgG2, IgG4, and IgA were detected in all patients through the follow-up. Although without statistical significance anti-T. cruzi IgE tends to be more reactive in patients with the indeterminate form (IND of the disease (p = 0.0637. As this study was conducted in patients with many years of chronic disease no anti-T. cruzi IgM was detected. Taken together, these results indicate that the levels of anti-T. cruzi IgG1 could be considered to seek for promising biomarkers to predict the severity of chronic Chagas disease cardiomyopathy.

  5. Evolution of anti-Trypanosoma cruzi antibody production in patients with chronic Chagas disease: Correlation between antibody titers and development of cardiac disease severity

    Science.gov (United States)

    Georg, Ingebourg; Hasslocher-Moreno, Alejandro Marcel; Xavier, Sergio Salles; de Holanda, Marcelo Teixeira; Bonecini-Almeida, Maria da Gloria

    2017-01-01

    Chagas disease is one of the most important endemic infections in Latin America affecting around 6–7 million people. About 30–50% of patients develop the cardiac form of the disease, which can lead to severe cardiac dysfunction and death. In this scenario, the identification of immunological markers of disease progression would be a valuable tool for early treatment and reduction of death rates. In this observational study, the production of anti-Trypanosoma cruzi antibodies through a retrospective longitudinal follow-up in chronic Chagas disease patients´ cohort and its correlation with disease progression and heart commitment was evaluated. Strong inverse correlation (ρ = -0.6375, p = 0.0005) between anti-T. cruzi IgG1 titers and left ventricular ejection fraction (LVEF) in chronic Chagas cardiomyopathy (CCC) patients were observed after disease progression. Elevated levels of anti-T. cruzi IgG3 titers were detected in all T. cruzi-infected patients, indicating a lack of correlation of this IgG isotype with disease progression. Furthermore, low levels of anti-T. cruzi IgG2, IgG4, and IgA were detected in all patients through the follow-up. Although without statistical significance anti-T. cruzi IgE tends to be more reactive in patients with the indeterminate form (IND) of the disease (p = 0.0637). As this study was conducted in patients with many years of chronic disease no anti-T. cruzi IgM was detected. Taken together, these results indicate that the levels of anti-T. cruzi IgG1 could be considered to seek for promising biomarkers to predict the severity of chronic Chagas disease cardiomyopathy. PMID:28723905

  6. Tetanus antibody titers and duration of immunity to clinical tetanus infections in free-ranging rhesus monkeys (Macaca mulatta).

    Science.gov (United States)

    Kessler, Matthew J; Berard, John D; Rawlins, Richard G; Bercovitch, Fred B; Gerald, Melissa S; Laudenslager, Mark L; Gonzalez-Martinez, Janis

    2006-07-01

    Prior to 1985 tetanus was a major cause of mortality in the free-ranging colony of rhesus monkeys on Cayo Santiago, accounting for almost a quarter of annual deaths. In 1985 and 1986 all animals (except infants) received primary and booster doses, respectively, of tetanus toxoid. In subsequent years primary immunizations were given to all yearlings, and boosters were administered to all 2-year-old animals during the annual capture of the colony. The main objectives of the tetanus immunization program were to reduce the pain and suffering caused by tetanus infections and to decrease mortality in the colony. Other objectives were to evaluate the efficacy of the two-dose tetanus toxoid immunization protocol and to determine whether additional boosters might be required to provide adequate long-term protection against tetanus infections. The immediate effect of the mass immunization program was the elimination of clinical tetanus infections in the population and a 42.2% reduction in the overall mortality rate. Since the immunization program began, no cases of tetanus have been observed in the colony, except in two unimmunized infants, and it has not been necessary to give tertiary injections of tetanus toxoid to maintain protection against infection. A sample collected in 2004 of the original cohort of monkeys immunized in 1985 and 1986 showed that 93.3% (14/15) had protective tetanus antibody titers (>0.01 IU/ml) at the ages of 20-23 years, which is close to the life expectancy of the Cayo Santiago rhesus macaques. Two intramuscular doses of tetanus toxoid provided long-term, if not lifelong, protection against tetanus for rhesus monkeys living in a tropical clime where tetanus is enzootic and the risk of infection is great. (c) 2005 Wiley-Liss, Inc.

  7. PEMBUATAN DAN STANDARISASI ANTIGEN AI H5N1 KOMERSIAL UNTUK MONITORING TITER ANTIBODI HASIL VAKSINASI AI DI INDUSTRI PETERNAKAN AYAM

    Directory of Open Access Journals (Sweden)

    Retno D. Soejoedono

    2012-04-01

    Full Text Available Vaccination is one of the chosen strategy for controling AI H5N1 in Indonesia. Vaccination able to induce protective antibodies against AI but unable to inhibit viral infection. Determination of antibody titers in the serum from bird vaccinated with AI-H5N1 vaccine consisting of 2 or 3 different AI virus isolates difficult to be meassured if the antigen for HI test is uncalibrated yet. Furthermore, the determination of a minimum protective antibody titer against the challenge of AI virus circulating in the field at this time needs to be done. This study aims to determine the H5N1 AI virus antigen for standart HI test and the minimum titre of antibodies that able neutralize virus infection. As much as 55 chickens were divided into 11 groups, 10 groups vaccinated with commercial AI vaccine and AI H5N1 field isolat antigen. Four types of commercial vaccines were veccinated to one group and seven other groups vaccinated with the antigen AI Legok 2004, Nagrak Ag 2009, Ag Lawang 2010, as well as polyvalent Ag combination of these three types of antigen. After third vaccinations, the presence of antibodieswere meassured by HI test. Serum with a titer test 26-28 were tested for the capability of virus neutralizationin using virus neutralization test against three different H5N1 AI virus field isolates. The test results showed that the H5N1 subtype AI virus antigen representative as standart antigen for HI test is antigen Legok 2004 and the minimum titer which able neutralize H5N1 AI virus field isolates 28

  8. Subcloning and expression of SO6 gene, Saponaria Officinalis plant in E.coli and investigation of antibody titer in rats

    OpenAIRE

    masoud abdollahi; hossein honari; shahram nazarian; mehdi masoudi kerahroudi

    2017-01-01

    Introduction: Plant ribosome inactivating proteins act as N-glycosidase enzyme and produce by several family of Caryophyllaceae such as Saponaria Officinalis. Different Isoforms of RIPs expressed by Saponaria Officinalis. SO6 isoform depurinate Adenine 4324 in the conserved GAGA loop of 28SrRNA and disrupts protein synthesis. The aim of this study was expression of SO6 isoform in E.coli and investigation of antibody titer in rats. Methods: In this experimental study, SO6 synthetic gene wa...

  9. Immune tolerance strategies in siblings with infantile Pompe disease — Advantages for a preemptive approach to high-sustained antibody titers

    Directory of Open Access Journals (Sweden)

    Elizabeth O. Stenger

    2015-09-01

    Full Text Available Enzyme replacement therapy (ERT has led to a significant improvement in the clinical course of patients with infantile Pompe disease (IPD, an autosomal recessive glycogen storage disorder characterized by the deficiency in lysosomal acid α-glucosidase. A subset of IPD patients mounts a substantial immune response to ERT developing high sustained anti-rhGAA IgG antibody titers (HSAT leading to the ineffectiveness of this treatment. HSAT have been challenging to treat, although preemptive approaches have shown success in high-risk patients (those who are cross-reactive immunological material [CRIM]-negative. More recently, the addition of bortezomib, a proteasome inhibitor known to target plasma cells, to immunotherapy with rituximab, methotrexate, and intravenous immunoglobulin has shown success at significantly reducing the anti-rhGAA antibody titers in three patients with HSAT. In this report, we present the successful use of a bortezomib-based approach in a CRIM-positive IPD patient with HSAT and the use of a preemptive approach to prevent immunologic response in an affected younger sibling. We highlight the significant difference in clinical course between the two patients, particularly that a pre-emptive approach was simple and effective in preventing the development of high antibody titers in the younger sibling, thus supporting the role of immune tolerance induction (ITI in the ERT-naïve high-risk setting.

  10. Immunocontraception of captive exotic species: V. Prolonged antibody titers in Dall sheep (Ovis dalli dalli) and domestic goats (Capra hircus) immunized with porcine zona pellucida.

    Science.gov (United States)

    Lyda, Robin O; Frank, Kimberly M; Wallace, Roberta; Lamberski, Nadine; Kirkpatrick, Jay F

    2013-12-01

    Native porcine zona pellucida (PZP) immunocontraception has been used to inhibit fertility in more than 80 species of ungulates, although the duration of contraception efficacy varies among species in both Perissodactyla and Artiodactyla. This study examined anti-PZP antibody titers in Dall sheep and domestic goats at the Milwaukee County Zoo, and also Himalayan tahr and Armenian Mouflon sheep at the San Diego Zoo Safari Park, and, for comparison, Altai wapiti, lowland wisent, Javan banteng, and southern pudu at the San Diego Zoo Safari Park, all were given a primer dose and booster dose of PZP. Of the San Diego Zoo Safari Park animals, the 4 comparison species demonstrated the typical 1-yr pattern of anti-PZP antibodies, whereas the Armenian sheep and Himalayan tahr showed prolonged (2-3 yr) antibody responses after a single primer and booster dose. The Dall sheep and domestic goats had significantly longer durations of antibody titers (3 yr) from a single year's treatment (primer plus booster). Analysis of the data indicates that Armenian sheep, Himalayan tahr, Dall sheep, and domestic goats have prolonged responses, and are more sensitive to PZP in that they produce a protracted antibody response.

  11. The effects of wet cupping on serum high-sensitivity C-reactive protein and heat shock protein 27 antibody titers in patients with metabolic syndrome.

    Science.gov (United States)

    Farahmand, Seyed Kazem; Gang, Li Zhi; Saghebi, Seyed Ahmad; Mohammadi, Maryam; Mohammadi, Shabnam; Mohammadi, Ghazaleh; Ferns, Gordan A; Ghanbarzadeh, Majid; Razmgah, Gholamreza Ghayour; Ramazani, Zahra; Ghayour-Mobarhan, Majid; Esmaily, Habibollah; Bahrami Taghanaki, Hamidreza; Azizi, Hoda

    2014-08-01

    It has previously been reported that increased level of serum heat shock proteins (Hsps) antibody in patients with metabolic syndrome. It is possible that the expression of Hsp and inflammatory markers can be affected by cupping and traditional Chinese medicine. There is a little data investigating the effects of cupping on markers of inflammation and Hsp proteins, hence, the objective of this study was evaluation of the effects of wet cupping on serum high-sensitivity C-reactive protein (hs-CRP) and Hsp27 antibody titers in patients with metabolic syndrome. Serum Hs-CRP and Hsp27 antibody titers were assessed in samples from 126 patients with metabolic syndrome (18-65 years of age) at baseline, and after 6 and 12 weeks after treatment. One hundred and twenty-six patients were randomly divided into the experimental group treated with wet cupping combined with dietary advice, and the control group treated with dietary advice alone using a random number table. Eight patients in case group and five subjects in control groups were excluded from the study. Data were analyzed using SPSS 15.0 software and a repeated measure ANCOVA. Serum hs-CRP titers did not change significantly between groups (p>0.05) and times (p=0.27). The same result was found for Hsp27 titers (p>0.05). Wet-cupping on the interscapular region has no effect on serum hs-CRP and Hsp27 patients with metabolic syndrome. Copyright © 2014 Elsevier Ltd. All rights reserved.

  12. Low titer, isolated anti Ro/SSA 60 kd antibodies is correlated with positive pregnancy outcomes in women at risk of congenital heart block.

    Science.gov (United States)

    Tonello, Marta; Hoxha, Ariela; Mattia, Elena; Zambon, Alessandra; Visentin, Silvia; Cerutti, Alessia; Ghirardello, Anna; Milanesi, Ornella; Ruffatti, Amelia

    2017-05-01

    Congenital heart block (CHB) is an autoantibody mediated disorder presumably caused by placental transmission of maternal autoantibodies to Ro/SSA 52 kd, p200, Ro/SSA 60 kd, La/SSB ribonucleoproteins. This study investigated the clinical significance of isolated anti-Ro/SSA 52 kd, anti-p200, anti-Ro/SSA 60 kd, and anti-La/SSB antibodies in positive pregnant patients. One hundred sixty-three pregnant women positive to anti-Ro/SSA 52 kd and/or anti-Ro/SSA 60 kd and/or anti-La/SSB antibodies were prospectively enrolled in the study. Anti-Ro52, anti-Ro60, anti-p200, and anti-La antibodies were assayed using home-made ELISA assays. Isolated antibody positivity was found in 25 women (15.3%), while multiple antibody positivity in 138 (84.7%). Twenty-four developed CHB, and the 139 had a favorable pregnancy outcome. The prevalence of isolated anti-Ro/SSA 60 kd antibodies was significantly higher (p < 0.046) as the prevalence of lower mean antibody titers (p < 0.0001) in the later group. Confirmation of these results by large-scale studies could lead clinicians to recommend less stringent fetal echocardiography monitoring in women with isolated anti-Ro/SSA 60 kd antibodies.

  13. ICAM-1-based rabies virus vaccine shows increased infection and activation of primary murine B cells in vitro and enhanced antibody titers in-vivo.

    Directory of Open Access Journals (Sweden)

    James E Norton

    Full Text Available We have previously shown that live-attenuated rabies virus (RABV-based vaccines infect and directly activate murine and human primary B cells in-vitro, which we propose can be exploited to help develop a single-dose RABV-based vaccine. Here we report on a novel approach to utilize the binding of Intracellular Adhesion Molecule-1 (ICAM-1 to its binding partner, Lymphocyte Function-associated Antigen-1 (LFA-1, on B cells to enhance B cell activation and RABV-specific antibody responses. We used a reverse genetics approach to clone, recover, and characterize a live-attenuated recombinant RABV-based vaccine expressing the murine Icam1 gene (rRABV-mICAM-1. We show that the murine ICAM-1 gene product is incorporated into virus particles, potentially exposing ICAM-1 to extracellular binding partners. While rRABV-mICAM-1 showed 10-100-fold decrease in viral titers on baby hamster kidney cells compared to the parental virus (rRABV, rRABV-mICAM-1 infected and activated primary murine B cells in-vitro more efficiently than rRABV, as indicated by significant upregulation of CD69, CD40, and MHCII on the surface of infected B cells. ICAM-1 expression on the virus surface was responsible for enhanced B cell infection since pre-treating rRABV-mICAM-1 with a neutralizing anti-ICAM-1 antibody reduced B cell infection to levels observed with rRABV alone. Furthermore, 100-fold less rRABV-mICAM-1 was needed to induce antibody titers in immunized mice equivalent to antibody titers observed in rRABV-immunized mice. Of note, only 10(3 focus forming units (ffu/mouse of rRABV-mICAM-1 was needed to induce significant anti-RABV antibody titers as early as five days post-immunization. As both speed and potency of antibody responses are important in controlling human RABV infection in a post-exposure setting, these data show that expression of Icam1 from the RABV genome, which is then incorporated into the virus particle, is a promising strategy for the development of a

  14. ICAM-1-based rabies virus vaccine shows increased infection and activation of primary murine B cells in vitro and enhanced antibody titers in-vivo.

    Science.gov (United States)

    Norton, James E; Lytle, Andrew G; Shen, Shixue; Tzvetkov, Evgeni P; Dorfmeier, Corin L; McGettigan, James P

    2014-01-01

    We have previously shown that live-attenuated rabies virus (RABV)-based vaccines infect and directly activate murine and human primary B cells in-vitro, which we propose can be exploited to help develop a single-dose RABV-based vaccine. Here we report on a novel approach to utilize the binding of Intracellular Adhesion Molecule-1 (ICAM-1) to its binding partner, Lymphocyte Function-associated Antigen-1 (LFA-1), on B cells to enhance B cell activation and RABV-specific antibody responses. We used a reverse genetics approach to clone, recover, and characterize a live-attenuated recombinant RABV-based vaccine expressing the murine Icam1 gene (rRABV-mICAM-1). We show that the murine ICAM-1 gene product is incorporated into virus particles, potentially exposing ICAM-1 to extracellular binding partners. While rRABV-mICAM-1 showed 10-100-fold decrease in viral titers on baby hamster kidney cells compared to the parental virus (rRABV), rRABV-mICAM-1 infected and activated primary murine B cells in-vitro more efficiently than rRABV, as indicated by significant upregulation of CD69, CD40, and MHCII on the surface of infected B cells. ICAM-1 expression on the virus surface was responsible for enhanced B cell infection since pre-treating rRABV-mICAM-1 with a neutralizing anti-ICAM-1 antibody reduced B cell infection to levels observed with rRABV alone. Furthermore, 100-fold less rRABV-mICAM-1 was needed to induce antibody titers in immunized mice equivalent to antibody titers observed in rRABV-immunized mice. Of note, only 10(3) focus forming units (ffu)/mouse of rRABV-mICAM-1 was needed to induce significant anti-RABV antibody titers as early as five days post-immunization. As both speed and potency of antibody responses are important in controlling human RABV infection in a post-exposure setting, these data show that expression of Icam1 from the RABV genome, which is then incorporated into the virus particle, is a promising strategy for the development of a single-dose RABV

  15. Monitoring of laying capacity, immunoglobulin Y concentration, and antibody titer development in chickens immunized with ricin and botulinum toxins over a two-year period.

    Science.gov (United States)

    Pauly, D; Dorner, M; Zhang, X; Hlinak, A; Dorner, B; Schade, R

    2009-02-01

    One of the key benefits in using chickens for immunization is the high yield of antibodies obtainable. It is known that egg production decreases over time, while animal maintenance costs remain stable. It would, however, be desirable to keep hens as long as possible to obtain maximal amounts of antibodies. To identify a suitable length of time that animals can be kept and to optimize the cost:yield ratio, we monitored the number of eggs laid, the total amount of chicken IgY, and the specific antibody titer from individually prepared eggs over a 2-yr period. The plant toxin ricin and the Clostridium botulinum neurotoxins type A and B were used to immunize 4 chickens. The number of eggs laid in 2 yr was approximately 600 per hen (about 80% of the maximum egg number), yielding about 20 to 40 g of total IgY per hen. A stable antibody titer of 1:100,000 to 1:1,000,000, as measured by ELISA, was obtained following up to 11 injections of 10 to 20 microg of immobilized native toxin. Laying capacities were found to decrease, on average, from 7 eggs/wk at the point of first immunization to 2 eggs/wk after more than 2 yr. In parallel, the yield of total and specific IgY increased over time, so that the antibody recovery remained high, even after prolonged immunization times. Using purified IgY preparations, classical immunological assays such as ELISA and Western blotting were performed. Furthermore, the IgY showed neutralizing capacity when used to block the functional activity of the toxins both in vitro and in vivo. Analysis of the total IgY content over time demonstrated a complex biological oscillation (and the antigen-specific titer), with a shorter time period of around 7 d (circaseptan rhythm). In summary, we successfully immunized chickens with ricin and botulinum neurotoxins and monitored laying capacity, IgY concentration, and specific antibody titer over an extended period of 2 yr.

  16. The importance of RSV F protein conformation in VLPs in stimulation of neutralizing antibody titers in mice previously infected with RSV.

    Science.gov (United States)

    Cullen, Lori M; Schmidt, Madelyn R; Morrison, Trudy G

    2017-06-12

    Respiratory syncytial virus (RSV) is a significant respiratory pathogen but no vaccine is available. RSV infections present 2 major, unique problems. First, humans can experience repeated infections caused by the same virus sero-group indicating that protective memory responses to RSV infection are defective. Second, most people have been infected with RSV by age 5. Immune responses to these infections, while poorly protective, could impact the effectiveness of a vaccine. The goal of this study was to assess the generation of protective immune responses in mice previously infected with RSV by virus-like particle (VLP) vaccine candidates containing a stabilized pre-fusion form of the RSV F protein or a stabilized post-fusion F protein. We report that a single immunization of RSV-experienced animals with a stabilized pre-fusion F protein VLP stimulated high titers of neutralizing antibody while a single injection of a post-fusion F protein VLP or a second RSV infection only weakly stimulated neutralizing antibody titers. These results suggest that prior RSV infection can induce neutralizing antibody memory responses, which can be activated by pre-F protein VLPs but not by post-F protein VLPs or a subsequent infection. Thus the F protein conformation has a major impact on enhancing production of neutralizing antibodies in RSV-experienced animals. Furthermore, although both VLPs contained the same RSV G protein, the pre-F VLP stimulated significantly higher titers of total anti-G protein IgG than the post-F VLP in both naïve and RSV-experienced animals. Thus the F protein conformation also influences anti-G protein responses.

  17. Effects of Thymoquinone on Interleukin-1 and Interferon Gamma Gene Expression and Antibody Titers against Newcastle Disease in Broiler Chickens under Oxidative Stress

    Directory of Open Access Journals (Sweden)

    A Rastad

    Full Text Available ABSTRACT An experiment was conducted to determine the effects of the dietary inclusion of different levels of thymoquinone (TQ of broilers subjected to oxidative stress or not on the antibody titers against Newcastle disease and on the gene expression of interleukine-1 and interferon gamma. A total of 320 one-day-old broilers was randomly assigned to eight treatments with four replicates of 10 birds each, in a 4 × 2 factorial arrangement, consisting of four thymoquinone (TQ levels (0, 5, 8, or 11 mg/kg body weight and two levels tert-butyl hydroperoxide (t-BHP injection (0 or 0.02 mmol/kg of body weight. Blood samples were collected from two birds per replicate to determine antibody titers against Newcastle disease. At the end of experiment, two birds per replicate were randomly selected, sacrificed and their spleens were collected to evaluate the genes expressioninterleukin-1 and interferon gamma (p<0.05. The dietary inclusion of TQ of broilers subjected or not oxidative stress increased antibody production against Newcastle disease (p<0.05. Both individual and combined dietary inclusion of t-BHP and TQ promote the differentiation and proliferation of spleen cells and the gene expression of interleukin-1 and interferon gamma (p<0.05.

  18. Growth Performance, Carcass Characteristics, Antibody Titer and Blood Parameters in Broiler Chickens Fed Dietary Myrtle (Myrtus communis Essential Oil as an Alternative to Antibiotic Growth Promoter

    Directory of Open Access Journals (Sweden)

    Mahmoodi Bardzardi M

    2014-03-01

    Full Text Available This experiment was conducted to determine the effects of Myrtle Essential Oil (MEO on growth performance, carcass characteristics, antibody titer and blood parameters of broiler chickens. A total of 200 Ross 308 broiler chickens were allocated to five dietary treatments with four replicates of 10 birds each. Dietary treatments were prepared by formulating a corn-soybean meal-based diet free of antibiotics (Control and supplementing the basal diet with three levels of MEO at 100, 200, 300 mg/Kg or antibiotic Flavophospholipol (FPL at 600 mg/Kg. The results showed that diets supplemented with MEO and FPL increased the feed intake, body weight gain and improved the feed conversion ratio compared to the control treatment (P. The relative carcass weight was significantly increased, whereas the weight of gastrointestinal tract and liver were decreased in broilers fed MEO (P. Supplementing the basal diet with MEO increased the antibody titers against Avian Influenza Virus (AIV and Newcastle disease Virus (NDV, although supplementing diet with 200 mg/Kg of MEO was more effective (P. Broilers fed MEO diets especially at the level of 300 mg/Kg had a lower white blood cells count and heterophil, heterophil to lymphocyte ratio, mean corpuscular volume and mean corpuscular hemoglobin, but a higher lymphocyte and red blood cells count (P. In conclusion, data showed that diet supplemented with MEO improved the growth performance and increased antibody titers against AIV and NDV, especially at the level of 200 mg/Kg, in broiler chickens and could be an adequate alternative to antibiotics.

  19. Response to treatment with interferon-alfa in patients with chronic hepatitis C and high titers of -M2, -M4 and -M8 antimitochondrial antibodies.

    Science.gov (United States)

    Garrido Palma, G; Sánchez Cuenca, J M; Olaso, V; Pina, R; Urquijo, J J; López Viedma, B; Bustamante, M; Berenguer, M; Berenguer, J

    1999-03-01

    The prevalence of antimitochondrial antibodies (AMA) in chronic hepatitis C is 2%; titers of AMA are usually low ( 1:160). to undertake a preliminary analysis of the submitochondrial profile of AMA in three patients with chronic hepatitis C and positive AMA titers (> 1:160). we determined antibodies to submitochondrial particles (subtypes) -M2, -M4 and -M8 by ELISA, complement binding (CB) and western immunoblotting with Immunoblot-M2 or WIB-M2 (immunoreactive bands). two patients were positive for mitochondrial subtypes by ELISA (IgG/IgM subclass) and CB (ELISA M2 470/365 in patient 1 and 600/1370 in patient 2; M4 490/1200 in patient 2. CB M2 1:128, M4 1:64, M8 1:64 in patient 1, M2 1:128 in patient 2). Immunoreactive epitopes (bands) were detected with WIB-M2 for 70, 56, 51, 45 and 36-kDa molecules. Interferon-alfa treatment was unsuccessful, with biochemical exacerbation of cholestasis. In contrast, the patient with no submitochondrial particles according to ELISA, CB and WIB-M2 results responded favorable to this drug. these preliminary results suggest that analyses to detect antibodies to submitochondrial particles (-M2, -M4 and -M8 subtypes) and -M2-immunoreactive epitopes in patients with chronic hepatitis C and AMA titers > 1:160 facilitates the diagnosis of primary biliary cirrhosis, and establishes a contraindication for treatment with interferon-alfa despite the presence of HCV infection.

  20. Immunoglobulin with High-Titer In Vitro Cross-Neutralizing Hepatitis C Virus Antibodies Passively Protects Chimpanzees from Homologous, but Not Heterologous, Challenge

    DEFF Research Database (Denmark)

    Bukh, Jens; Engle, Ronald E.; Faulk, Kristina

    2015-01-01

    The importance of neutralizing antibodies (NAbs) in protection against hepatitis C virus (HCV) remains controversial. We infused a chimpanzee with H06 immunoglobulin from a genotype 1a HCV-infected patient and challenged with genotype strains efficiently neutralized by H06 in vitro. Genotype 1a...... NAbs afforded no protection against genotype 4a or 5a. Protection against homologous 1a lasted 18 weeks, but infection emerged when NAb titers waned. However, 6a infection was prevented. The differential in vivo neutralization patterns have implications for HCV vaccine development....

  1. Epilepsy and behavioral changes, type 1 diabetes mellitus and a high titer of glutamic acid decarboxylase antibodies.

    Science.gov (United States)

    Ganelin-Cohen, Esther; Modan-Moses, Dalit; Hemi, Rina; Kanety, Hannah; Ben-Zeev, Bruria; Hampe, Christiane S

    2016-12-01

    Autoantibodies to the 65 kDa isoform of glutamate acid decarboxylase (GAD65Ab) are associated with a range of clinical disorders, including type 1 diabetes (T1D) and stiff-person syndrome (SPS). In this article we describe a young girl who was diagnosed with T1D at the end of her first year of life and developed drug-resistant epilepsy 18 months later, followed by behavioral disturbances. She was admitted to our center at the age of 5 yr, at which time high GAD65Ab titers were detected in the patient's serum and cerebrospinal fluid (CSF). The titer remained elevated during 19 months of follow-up. Furthermore, GAD65Ab in both serum and CSF showed epitope binding characteristics similar to those observed for GAD65Ab in SPS patients, and GAD65Ab in the serum reduced GAD65 enzyme activity. Our results suggest an association between high GAD65Ab titers and epilepsy in children with T1D. Careful titration and characterization of GAD65Ab regarding inhibition of enzyme activity and epitope specificity may be helpful in identifying T1D patients at risk for neurological complications. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  2. ANTIBODY TITER AGAINST HBSAGIN CHILDREN ENTERING ELEMENTARY SCHOOL WHO WERE VACCINATED AGAINST HEPATITIS B AT BIRTH: SBAHR.E.KORD CITY

    Directory of Open Access Journals (Sweden)

    K MOSTAFAVIZADEH

    2001-09-01

    Full Text Available Introduction. Regarding the fact that hepatitis B and its complications is a serious problem routine vaccination against it is recommended at birth. Fortunately, since 1991 all infants in our country are vaccinated against the disease. This study was designed to evaluate hepatitis B vaccine induced immunity 5-6 years after vaccination. If antibody titer is below the protective level booster dose should be considered. Methods. This study is a cross-sectional one which 394 cases selected randomly. After filling up questionnaires sampling was performed and sample sera were checked out for anti HBsAg antibody by ELISA method.Results were announced as positive and negative. Some variables Such as age, gender, growth and development and time of vaccination also were evaluated. Results. From the total number of 394 cases, 142 (36 percent had antibody title less than (10 MIU which is not protective. Rate of negative response was 32.2 percent for girls and 39 percent for boys. The same rate for children of 2-2.5, 2.5-3.5and over 3 kg weight at birth was 44 percent 36.percent and 34.8 percent respectively. Regarding the time, 16 cases had delayed vaccination with 44 percent negative response. Rate of negative response in children who received regular vaccination was 35.7 percent. Negative response rate for 25 cases above the acceptable level of growth was 8 percent and for 6 cases below the level was 17 percent. In rural and urban population negative response rate was 35.4 percent and 36.7 percent respectively. Discussion. Cases with negative response are suscoptible to infection so it is recommended to 1: Carryout investigations to determine causes of decline in antibody titer. 2: Carryout investigations in other parts of country to recheck the results of this study. 3: administer booster dose to high-risk cases with negative response.

  3. Detection of anti-infliximab antibodies is impacted by antibody titer, infliximab level and IgG4 antibodies: a systematic comparison of three different assays

    Science.gov (United States)

    Afonso, Joana; Lopes, Susana; Gonçalves, Raquel; Caldeira, Paulo; Lago, Paula; Tavares de Sousa, Helena; Ramos, Jaime; Gonçalves, Ana Rita; Ministro, Paula; Rosa, Isadora; Vieira, Ana Isabel; Coelho, Rosa; Tavares, Patrícia; Soares, João; Sousa, Ana Lúcia; Carvalho, Diana; Sousa, Paula; da Silva, João Pereira; Meira, Tânia; Silva Ferreira, Filipa; Dias, Cláudia Camila; Chowers, Yehuda; Ben-Horin, Shomron; Magro, Fernando

    2016-01-01

    Background: There is scant information on the accuracy of different assays used to measure anti-infliximab antibodies (ADAs), especially in the presence of detectable infliximab (IFX). We thus aimed to evaluate and compare three different assays for the detection of IFX and ADAs and to clarify the impact of the presence of circulating IFX on the accuracy of the ADA assays. Methods: Blood samples from 79 ulcerative colitis (UC) patients treated with infliximab were assessed for IFX levels and ADAs using three different assays: an in-house assay and two commercial kits, Immundiagnostik and Theradiag. Sera samples with ADAs and undetectable levels of IFX were spiked with exogenous IFX and analyzed for ADAs. Results: The three assays showed 81–96% agreement for the measured IFX level. However, the in-house assay and Immundiagnostik assays detected ADAs in 34 out of 79 samples, whereas Theradiag only detected ADAs in 24 samples. Samples negative for ADAs with Theradiag, but ADA-positive in both the in-house and Immundiagnostik assays, were positive for IFX or IgG4 ADAs. In spiking experiments, a low concentration of exogenous IFX (5 µg/ml) hampered ADA detection with Theradiag in sera samples with ADA levels of between 3 and 10 µg/ml. In the Immundiagnostik assay detection interference was only observed at concentrations of exogenous IFX higher than 30 µg/ml. However, in samples with high levels of ADAs (>25 µg/ml) interference was only observed at IFX concentrations higher than 100 µg/ml in all three assays. Binary (IFX/ADA) stratification of the results showed that IFX+/ADA- and IFX-/ADAs+ were less influenced by the assay results than the double-positive (IFX+/ADAs+) and double-negative (IFX-/ADAs-) combination. Conclusions: All three methodologies are equally suitable for measuring IFX levels. However, erroneous therapeutic decisions may occur when patients show double-negative (IFX-/ADAs-) or double-positive (IFX+/ADAs+) status, since agreement between

  4. A comparison of titers of anti-Brucella antibodies of naturally infected and healthy vaccinated cattle by standard tube agglutination test, microtiter plate agglutination test, indirect hemagglutination assay, and indirect enzyme-linked immunosorbent assay

    Directory of Open Access Journals (Sweden)

    Anju Mohan

    2016-07-01

    Full Text Available Aim: We determined the antibody response in cattle naturally infected with brucellosis and normal healthy adult cattle vaccinated during calf hood with strain 19. Materials and Methods: The antibody titers were measured by standard tube agglutination test (STAT, microtiter plate agglutination test (MAT, indirect hemagglutination assay (IHA, and indirect enzyme-linked immunosorbent assay (iELISA as per standard protocols. Results: The mean STAT titers were 1.963±0.345 in infected cattle and 1.200±0.155 in healthy vaccinated cattle. The difference was extremely significant (p<0.0001. The mean MAT titers were 2.244±0.727 in infected cattle and 1.200±0.155 in healthy vaccinated cattle. The difference was very significant (p<0.005. The mean IHA titers in infected cattle were 2.284±0.574, and those in healthy vaccinated cattle were 1.200±0.155. The difference was extremely significant (p=0.0002. However, the difference in mean iELISA titers of infected cattle (1.3678±0.014 and healthy vaccinated cattle (1.367±0.014 was non-significant. The infected animals showed very high titers of agglutinating antibodies compared to the vaccinated animals. However, it cannot be ascertained whether these antibodies are due to vaccine or response to infection. Since the infected animals had been vaccinated earlier, the current infection may suggest that vaccination was unable to induce protective levels of antibody. The heightened antibody response after infection may also indicate a secondary immune response to the antigens common to the vaccine strain and wild Brucella organisms. Conclusion: The brucellosis infected animals showed very high titers of agglutinating antibodies compared to the vaccinated animals.

  5. Mechanisms of HIV-1 subtype C resistance to GRFT, CV-N and SVN

    CSIR Research Space (South Africa)

    Alexandre, Kabamba B

    2013-11-01

    Full Text Available We examined the ability of HIV-1 subtype C to develop resistance to the inhibitory lectins, griffithsin (GRFT), cyanovirin-N (CV-N) and scytovirin (SVN), which bind multiple mannose-rich glycans on gp120. Four primary HIV-1 strains cultured under...

  6. Increased titers of neutralizing antibodies after immunization with both envelope proteins of the porcine endogenous retroviruses (PERVs

    Directory of Open Access Journals (Sweden)

    Denner Joachim

    2012-11-01

    Full Text Available Abstract Despite enormous difficulties to induce antibodies neutralizing HIV-1, especially broadly neutralizing antibodies directed against the conserved membrane proximal external region (MPER of the transmembrane envelope protein, such antibodies can be easily induced in the case of gammaretroviruses, among them the porcine endogenous retroviruses (PERVs. In addition to neutralizing antibodies directed against the transmembrane envelope protein p15E, neutralizing antibodies were also induced by immunization with the surface envelope protein gp70. PERVs represent a special risk for xenotransplantation using pig tissues or organs since they are integrated in the genome of all pigs and infect human cells and a vaccine may protect from transmission to the recipient. To investigate the effect of simultaneous immunization with both proteins in detail, a study was performed in hamsters. Gp70 and p15E of PERV were produced in E. coli, purified and used for immunization. All animals developed binding antibodies against the antigens used for immunization. Sera from animals immunized with p15E recognized epitopes in the MPER and the fusion peptide proximal region (FPPR of p15E. One MPER epitope showed a sequence homology to an epitope in the MPER of gp41 of HIV-1 recognized by broadly neutralizing antibodies found in HIV infected individuals. Neutralizing antibodies were detected in all sera. Most importantly, sera from animals immunized with gp70 had a higher neutralizing activity when compared with the sera from animals immunized with p15E and sera from animals immunized with gp70 together with p15E had a higher neutralizing activity compared with sera from animals immunized with each antigen alone. These immunization studies are important for the development of vaccines against other retroviruses including the human immunodeficiency virus HIV-1.

  7. RI-002, an intravenous immunoglobulin containing high titer neutralizing antibody to RSV and other respiratory viruses for use in primary immunodeficiency disease and other immune compromised populations.

    Science.gov (United States)

    Wasserman, Richard L; Greener, Benjamin N; Mond, James

    2017-10-16

    Novel immune globulin (IG) products (RI-002, RI-001) have been designed to provide protection against respiratory syncytial virus (RSV) mediated respiratory illness while at the same time meeting the manufacturing requirements established by FDA for antibody supplementation in immunocompromised subjects. Areas covered: This review covers the manufacture and development of both RI-001 and RI-002, including the selection of plasma donors for IG preparation with high-titers of anti-RSV antibody, in vitro, and preclinical data in the cotton rat model S. hispidus, and clinical trials including Phase II and compassionate use studies of RI-001 and a multi-center, pivotal Phase III study of RI-002 in PIDD patients. Expert commentary: The data demonstrate that RI-002 is efficacious in the prevention and treatment of RSV in preclinical normal and immune suppressed animal models and is safe and efficacious in the treatment of patients with various forms of primary immunodeficiency disease (PIDD). This product offers potential advantages over other available IG's for prophylaxis in immunocompromised patients requiring polyclonal immunoglobulin supplementation because of its unique antibody composition. In addition to its enhanced neutralizing anti-RSV activity and its polyclonal IG composition, there is preclinical data to support the use of RI-002 for humoral protection against other respiratory pathogens.

  8. Bartonella henselae prevalence in domestic cats in California: risk factors and association between bacteremia and antibody titers.

    OpenAIRE

    Chomel, B.B.; Abbott, R C; Kasten, R W; Floyd-Hawkins, K A; Kass, P.H.; Glaser, C A; Pedersen, N C; Koehler, J. E.

    1995-01-01

    The isolation of Bartonella henselae, the agent of cat scratch disease, from the blood of naturally infected domestic cats and the demonstration that cats remain bacteremic for several months suggest that cats play a major role as a reservoir for this bacterium. A convenience sample of 205 cats from northern California was selected between 1992 and 1994 to evaluate the B. henselae antibody and bacteremia prevalences and to determine the risk factors and associations between bacteremia and ant...

  9. ANTIMITOCHONDRIAL ANTIBODY PROFILES IN PATIENTS WITH PRIMARY BILIARY-CIRRHOSIS BEFORE ORTHOTOPIC LIVER-TRANSPLANTATION AND TITERS OF ANTIMITOCHONDRIAL ANTIBODY-SUBTYPES AFTER TRANSPLANTATION

    NARCIS (Netherlands)

    HUIZENGA, [No Value; GIPS, CH; BERG, PA

    Four antimitochondrial antibody profiles (A-D) have been defined in primary biliary cirrhosis according to the presence of antibodies to M2, M4, M8, and M9 in ELISA and the complement fixation test: A: anti-M9 positive in ELISA and western blot, B: anti-M9 and/or anti-M2 positive in ELISA, C:

  10. A case-control study developing a model for predicting risk factors for high SeM-specific antibody titers after natural outbreaks of Streptococcus equi subsp equi infection in horses.

    Science.gov (United States)

    Boyle, Ashley G; Smith, Meagan A; Boston, Raymond C; Stefanovski, Darko

    2017-06-15

    OBJECTIVE To develop a risk prediction model for factors associated with an SeM-specific antibody titer ≥ 3,200 in horses after naturally occurring outbreaks of Streptococcus equi subsp equi infection and to validate this model. DESIGN Case-control study. ANIMALS 245 horses: 57 horses involved in strangles outbreaks (case horses) and 188 healthy horses (control horses). PROCEDURES Serum samples were obtained from the 57 cases over a 27.5-month period after the start of outbreaks; serum samples were obtained once from the 188 controls. A Bayesian mixed-effects logistic regression model was used to assess potential risk factors associated with an antibody titer ≥ 3,200 in the case horses. A cutoff probability for an SeM-specific titer ≥ 3,200 was determined, and the model was externally validated in the control horses. Only variables with a 95% credibility interval that did not overlap with a value of 1 were considered significant. RESULTS 9 of 57 (6%) case horses had at least 1 titer ≥ 3,200, and 7 of 188 (3.7%) of control horses had a titer ≥ 3,200. The following variables were found to be significantly associated with a titer ≥ 3,200 in cases: farm size > 20 horses (OR, 0.11), history of clinically evident disease (OR, 7.92), and male sex (OR, 0.11). The model had 100% sensitivity but only 24% specificity when applied to the 188 control horses (area under the receiver operating characteristic curve = 0.62.) CONCLUSIONS AND CLINICAL RELEVANCE Although the Bayesian mixed-effects logistic regression model developed in this study did not perform well, it may prove useful as an initial screening tool prior to vaccination. We suggest that SeM-specific antibody titer be measured prior to vaccination when our model predicts a titer ≥ 3,200.

  11. Whole-Chain Tick Saliva Proteins Presented on Hepatitis B Virus Capsid-Like Particles Induce High-Titered Antibodies with Neutralizing Potential.

    Directory of Open Access Journals (Sweden)

    Philipp Kolb

    Full Text Available Ticks are vectors for various, including pathogenic, microbes. Tick saliva contains multiple anti-host defense factors that enable ticks their bloodmeals yet also facilitate microbe transmission. Lyme disease-causing borreliae profit specifically from the broadly conserved tick histamine release factor (tHRF, and from cysteine-rich glycoproteins represented by Salp15 from Ixodes scapularis and Iric-1 from Ixodes ricinus ticks which they recruit to their outer surface protein C (OspC. Hence these tick proteins are attractive targets for anti-tick vaccines that simultaneously impair borrelia transmission. Main obstacles are the tick proteins´ immunosuppressive activities, and for Salp15 orthologs, the lack of efficient recombinant expression systems. Here, we exploited the immune-enhancing properties of hepatitis B virus core protein (HBc derived capsid-like particles (CLPs to generate, in E. coli, nanoparticulate vaccines presenting tHRF and, as surrogates for the barely soluble wild-type proteins, cysteine-free Salp15 and Iric-1 variants. The latter CLPs were exclusively accessible in the less sterically constrained SplitCore system. Mice immunized with tHRF CLPs mounted a strong anti-tHRF antibody response. CLPs presenting cysteine-free Salp15 and Iric-1 induced antibodies to wild-type, including glycosylated, Salp15 and Iric-1. The broadly distributed epitopes included the OspC interaction sites. In vitro, the anti-Salp15 antibodies interfered with OspC binding and enhanced human complement-mediated killing of Salp15 decorated borreliae. A mixture of all three CLPs induced high titered antibodies against all three targets, suggesting the feasibility of combination vaccines. These data warrant in vivo validation of the new candidate vaccines´ protective potential against tick infestation and Borrelia transmission.

  12. Can Administration of Potentized Homeopathic Remedy, Arsenicum Album, Alter Antinuclear Antibody (ANA Titer in People Living in High-Risk Arsenic Contaminated Areas? I. A Correlation with Certain Hematological Parameters

    Directory of Open Access Journals (Sweden)

    Philippe Belon

    2006-01-01

    Full Text Available To examine whether elevated antinuclear antibody (ANA titers reported in random human population of arsenic contaminated villages can be reverted to the normal range by administration of a potentized homeopathic drug, Arsenicum album, randomly selected volunteers in two arsenic contaminated villages and one arsenic-free village in West Bengal (India were periodically tested for their ANA titer as well as various blood parameters in two types of experiments: ‘placebo-controlled double blind’ experiment for shorter duration and ‘uncontrolled verum fed experiment’ for longer duration. Positive modulation of ANA titer was observed along with changes in certain relevant hematological parameters, namely total count of red blood cells and white blood cells, packed cell volume, hemoglobin content, erythrocyte sedimentation rate and blood sugar level, mostly within 2 months of drug administration. Thus, Arsenicum album appears to have great potential for ameliorating arsenic induced elevated ANA titer and other hematological toxicities.

  13. Measles virus antibody responses in children randomly assigned to receive standard-titer edmonston-zagreb measles vaccine at 4.5 and 9 months of age, 9 months of age, or 9 and 18 months of age

    DEFF Research Database (Denmark)

    Martins, Cesario; Garly, May-Lill; Bale, Carlitos

    2014-01-01

    The World Health Organization recommends administration of measles vaccine (MV) at age 9 months in low-income countries. We tested the measles virus antibody response at 4.5, 9, 18, and 24 months of age for children randomly assigned to receive standard-titer Edmonston-Zagreb MV at 4.5 and 9 months...

  14. Active immunization against gonadotrophin-releasing hormone in Chinese male pigs: effects of dose on antibody titer, hormone levels and sexual development.

    Science.gov (United States)

    Zeng, Xian Y; Turkstra, Johan A; Meloen, Rob H; Liu, Xian Y; Chen, Fa Q; Schaaper, Wim M M; Oonk, H B; Guo, Da Z; van de Wiel, Dick F M

    2002-04-15

    The objective of this study was to determine the optimal dose of a GnRH vaccine for immunocastration of Chinese male pigs, based on immune, endocrine and testicular responses. Forty-two crossbred (Chinese Yanan x Large White) male pigs were randomly assigned to one of the five treatments as follows: (I) 0 microg (control, n=8); (II) 10 microg (n=8); (III) 62.5 microg (n=8); (IV) 125 microg (n=8); (V) 250 microg (n=10), D-Lys6-GnRH tandem dimer (TDK) peptide equivalent of conjugate (TDK-OVA), using Specol as the adjuvant. Pigs were immunized at 13 and 21 weeks of age and were slaughtered at 31 weeks of age. Blood samples for antibody titer and hormone assays were collected at 13, 21, 24 and 31 weeks of age. At these time-points, testis size was also measured. At slaughter, testis weight was recorded and fat samples were collected for androstenone assay. Four animals, one out of each immunized group, responded poorly to the immunization (non-responders). At slaughter, serum testosterone and LH levels, fat androstenone levels and testis size/weight of these non-responders were similar to those in control animals. Antibody titers of non-responders were substantially lower (Pimmunized pigs. For the animals that responded well to the immunization (immunocastrated pigs), serum testosterone and LH levels, fat androstenone levels and testis size or weight were reduced (Ppigs in treatments II-V was reduced to 55, 21, 33 and 25%, respectively, whereas testis weight was reduced to 39, 12, 18 and 14%, respectively. Reduction of testis size and/or weight is important for visual assessment of castration at the slaughterline, therefore, it is concluded that a dose of 10 microg peptide is not suitable. We conclude that, within the dose-range studied, the 62.5 microg dose is optimal for future GnRH immunization studies or future practical use in immunocastration of Chinese male pigs.

  15. Effect of ambient temperature on viral replication and serum antibody titers following administration of a commercial intranasal modified-live infectious bovine rhinotracheitis-parainfluenza-3 virus vaccine to beef cattle housed in high- and moderate-ambient temperature environments.

    Science.gov (United States)

    Grissett, Gretchen P; White, Brad J; Anderson, David E; Larson, Robert E; Miesner, Matt D

    2014-12-01

    To evaluate the effect of ambient temperature on viral replication and serum antibody titers following administration of an intranasal modified-live infectious bovine rhinotracheitis (IBR)-parainfluenza-3 (PI3) virus vaccine to beef calves housed in high- (> 32°C) and moderate- (21°C) ambient temperature environments. 28 calves (mean weight, 206.8 kg). Calves were randomly allocated to 4 treatment groups (housed outdoors during high ambient temperature with [HAT; n = 10] or without [HAC; 4] vaccination or housed indoors in a moderate ambient temperature with [MAT; 10] or without [MAC; 4] vaccination). Rectal and nasal mucosal temperatures were recorded every 2 hours from 8 AM to 8 PM on days 0 (vaccination) and 1. Nasal swab specimens were obtained on days 0 through 7 for virus isolation. Serum samples were collected on days 0, 7, 14, and 28 for determination of antibody titers. Mean rectal temperature did not differ among the treatment groups. Mean nasal temperature for the HAT group was significantly higher than that for the MAT group at 6, 24, 30, 32, and 38 hours after vaccination. Viable IBR virus was isolated from all vaccinated calves on days 1 through 6. Two weeks after vaccination, vaccinated calves had anti-IBR antibody titers that were significantly greater than those for unvaccinated calves. Mean anti-IBR antibody titers did not differ significantly between the HAT and MAT groups. Results indicated that, following vaccination with an intranasal modified-live IBR-PI3 virus vaccine, IBR viral replication and serum antibody titers did not differ significantly between calves housed in high- and moderate-ambient temperature environments.

  16. Pichia pastoris-expressed dengue 2 envelope forms virus-like particles without pre-membrane protein and induces high titer neutralizing antibodies.

    Directory of Open Access Journals (Sweden)

    Shailendra Mani

    Full Text Available Dengue is a mosquito-borne viral disease with a global prevalence. It is caused by four closely-related dengue viruses (DENVs 1-4. A dengue vaccine that can protect against all four viruses is an unmet public health need. Live attenuated vaccine development efforts have encountered unexpected interactions between the vaccine viruses, raising safety concerns. This has emphasized the need to explore non-replicating dengue vaccine options. Virus-like particles (VLPs which can elicit robust immunity in the absence of infection offer potential promise for the development of non-replicating dengue vaccine alternatives. We have used the methylotrophic yeast Pichia pastoris to develop DENV envelope (E protein-based VLPs. We designed a synthetic codon-optimized gene, encoding the N-terminal 395 amino acid residues of the DENV-2 E protein. It also included 5' pre-membrane-derived signal peptide-encoding sequences to ensure proper translational processing, and 3' 6× His tag-encoding sequences to facilitate purification of the expressed protein. This gene was integrated into the genome of P. pastoris host and expressed under the alcohol oxidase 1 promoter by methanol induction. Recombinant DENV-2 protein, which was present in the insoluble membrane fraction, was extracted and purified using Ni(2+-affinity chromatography under denaturing conditions. Amino terminal sequencing and detection of glycosylation indicated that DENV-2 E had undergone proper post-translational processing. Electron microscopy revealed the presence of discrete VLPs in the purified protein preparation after dialysis. The E protein present in these VLPs was recognized by two different conformation-sensitive monoclonal antibodies. Low doses of DENV-2 E VLPs formulated in alum were immunogenic in inbred and outbred mice eliciting virus neutralizing titers >1,1200 in flow cytometry based assays and protected AG129 mice against lethal challenge (p<0.05. The formation of immunogenic DENV-2 E

  17. Ameliorative effect of a microbial feed additive on infectious bronchitis virus antibody titer and stress index in broiler chicks fed deoxynivalenol.

    Science.gov (United States)

    Ghareeb, K; Awad, W A; Böhm, J

    2012-04-01

    Although acute mycotoxicoses are rare in poultry production, chronic exposure to low levels of mycotoxins is responsible for reduced productivity and increased susceptibility to infectious diseases. Deoxynivalenol (DON) is known to modulate immune function, but only a few studies have investigated the effect of DON on the vaccinal immune response. In addition, the effects of Mycofix select (Biomin GmbH, Herzogenburg, Austria) supplementation to DON-contaminated broiler diets have not yet been demonstrated. Therefore, an experiment with 1-d-old male broilers (Ross 308) was carried out to examine the effects of feeding DON-contaminated low-protein grower diets on performance, serum biochemical parameters, lymphoid organ weight, and antibody titers to infectious bronchitis vaccination in serum and to evaluate the effects of Mycofix select dietary supplementation in either the presence or absence of DON in broilers. In total, thirty-two 1-d-old broiler chicks were randomly assigned to 1 of the 4 dietary treatments for 5 wk. The dietary treatments were 1) control; 2) artificially contaminated diets with 10 mg of DON/kg of diet; 3) DON-contaminated diets supplemented with Mycofix select; and 4) control diet supplemented with Mycofix select. Feeding of contaminated diets decreased (P = 0.000) the feed intake, BW (P = 0.001), BW gain (P = 0.044), and feed efficiency during the grower phase. Deoxynivalenol affected the blood biochemistry, whereas plasma total protein and uric acid concentrations in birds fed contaminated grains were decreased compared with those of the controls. Moreover, in birds fed contaminated feeds, there was a tendency to reduce triglycerides in the plasma (P = 0.090), suggesting that DON in the diets affected protein and lipid metabolism in broiler chickens. The feeding of contaminated diets altered the immune response in broilers by reducing the total lymphocyte count. Similarly, the antibody response against infectious bronchitis vaccination

  18. In-Cell Western Assays to Evaluate Hantaan Virus Replication as a Novel Approach to Screen Antiviral Molecules and Detect Neutralizing Antibody Titers

    Directory of Open Access Journals (Sweden)

    Hong-Wei Ma

    2017-06-01

    Full Text Available Hantaviruses encompass rodent-borne zoonotic pathogens that cause severe hemorrhagic fever disease with high mortality rates in humans. Detection of infectious virus titer lays a solid foundation for virology and immunology researches. Canonical methods to assess viral titers rely on visible cytopathic effects (CPE, but Hantaan virus (HTNV, the prototype hantavirus maintains a relatively sluggish life cycle and does not produce CPE in cell culture. Here, an in-cell Western (ICW assay was utilized to rapidly measure the expression of viral proteins in infected cells and to establish a novel approach to detect viral titers. Compared with classical approaches, the ICW assay is accurate and time- and cost-effective. Furthermore, the ICW assay provided a high-throughput platform to screen and identify antiviral molecules. Potential antiviral roles of several DExD/H box helicase family members were investigated using the ICW assay, and the results indicated that DDX21 and DDX60 reinforced IFN responses and exerted anti-hantaviral effects, whereas DDX50 probably promoted HTNV replication. Additionally, the ICW assay was also applied to assess NAb titers in patients and vaccine recipients. Patients with prompt production of NAbs tended to have favorable disease outcomes. Modest NAb titers were found in vaccinees, indicating that current vaccines still require improvements as they cannot prime host humoral immunity with high efficiency. Taken together, our results indicate that the use of the ICW assay to evaluate non-CPE Hantaan virus titer demonstrates a significant improvement over current infectivity approaches and a novel technique to screen antiviral molecules and detect NAb efficacies.

  19. H-Y antibody titers are increased in unexplained secondary recurrent miscarriage patients and associated with low male : female ratio in subsequent live births

    DEFF Research Database (Denmark)

    Nielsen, H S; Wu, F; Aghai, Z

    2010-01-01

    The birth of a boy is significantly more common than a girl prior to secondary recurrent miscarriage (SRM) and is associated with a poorer chance of a subsequent live birth. Children born after SRM are more likely to be girls. High-titer antisera specific for male antigens (H-Y) have been shown...

  20. Free Thyroxine, Anti-Thyroid Stimulating Hormone Receptor Antibody Titers, and Absence of Goiter Were Associated with Responsiveness to Methimazole in Patients with New Onset Graves' Disease

    Directory of Open Access Journals (Sweden)

    Hoon Sung Choi

    2017-06-01

    Full Text Available BackgroundAnti-thyroid drug therapy is considered a treatment of choice for Graves' disease; however, treatment response varies among individuals. Although several studies have reported risk factors for relapse after initial treatment, few have assessed responsiveness during the early treatment period. Our study aimed to identify the clinical characteristics for responsiveness to methimazole.MethodsWe included 99 patients diagnosed with Graves' disease for the first time. Drug responsiveness was defined as the correlation coefficients between decreasing rates of free thyroxine level per month and methimazole exposure dose. According to their responsiveness to treatment, the patients were classified into rapid or slow responder groups, and age, sex, free thyroxine level, and thyrotropin binding inhibiting immunoglobulin (TBII titers were compared between groups.ResultsThe mean patient age was 44.0±13.5 years and 40 patients were male (40%. The mean TBII titer was 36.6±74.4 IU/L, and the mean free thyroxine concentration was 48.9±21.9 pmol/L. The rapid responder group showed higher TBII titer and free thyroxine level at diagnosis, while age, sex, smoking, and presence of goiter did not differ between the two groups. Logistic regression analyses revealed that high level of serum thyroxine, high titer of TBII, and absence of goiter were significantly associated with a rapid response, while age, sex, and smoking were not significant factors for the prediction of responsiveness.ConclusionIn patients with new onset Graves' disease, high level of free thyroxine, high titer of TBII, and absence of goiter were associated with rapid responsiveness to methimazole treatment.

  1. Alum and squalene-oil-in-water emulsion enhance the titer and avidity of anti-Aβ antibodies induced by multimeric protein antigen (1-11)E2, preserving the Igg1-skewed isotype distribution.

    Science.gov (United States)

    Mantile, Francesca; Trovato, Maria; Santoni, Andrea; Barba, Pasquale; Ottonello, Simone; De Berardinis, Piergiuseppe; Prisco, Antonella

    2014-01-01

    The development of active immunotherapy for Alzheimer's disease (AD) requires the identification of immunogens that can ensure a high titer antibody response toward Aβ, while minimizing the risks of adverse reactions. Multimeric protein (1-11)E2 induces a robust and persistent antibody response to Aβ in mice, when formulated in Freund's adjuvant. The goal of this translational study was to evaluate the immunogenicity of (1-11)E2 formulated in alum (Alhydrogel 2%), or in a squalene oil-in-water emulsion (AddaVax), or without adjuvant. A IgG1-skewed isotype distribution was observed for the anti-Aβ antibodies generated in mice immunized with either the non-adjuvanted or the adjuvanted vaccine, indicating that (1-11)E2 induces a Th2-like response in all tested conditions. Both Alhydrogel 2% and AddaVax enhanced the titer and avidity of the anti-Aβ response elicited by (1-11)E2. We conclude that (1-11)E2 is a promising candidate for anti-Aβ immunization protocols that include alum or squalene-oil-in-water emulsion, or no adjuvant.

  2. Alum and squalene-oil-in-water emulsion enhance the titer and avidity of anti-Aβ antibodies induced by multimeric protein antigen (1-11E2, preserving the Igg1-skewed isotype distribution.

    Directory of Open Access Journals (Sweden)

    Francesca Mantile

    Full Text Available The development of active immunotherapy for Alzheimer's disease (AD requires the identification of immunogens that can ensure a high titer antibody response toward Aβ, while minimizing the risks of adverse reactions. Multimeric protein (1-11E2 induces a robust and persistent antibody response to Aβ in mice, when formulated in Freund's adjuvant. The goal of this translational study was to evaluate the immunogenicity of (1-11E2 formulated in alum (Alhydrogel 2%, or in a squalene oil-in-water emulsion (AddaVax, or without adjuvant. A IgG1-skewed isotype distribution was observed for the anti-Aβ antibodies generated in mice immunized with either the non-adjuvanted or the adjuvanted vaccine, indicating that (1-11E2 induces a Th2-like response in all tested conditions. Both Alhydrogel 2% and AddaVax enhanced the titer and avidity of the anti-Aβ response elicited by (1-11E2. We conclude that (1-11E2 is a promising candidate for anti-Aβ immunization protocols that include alum or squalene-oil-in-water emulsion, or no adjuvant.

  3. Chlamydia pneumoniae IgG and IgA antibody titers and prognosis in patients with coronary heart disease: results from the CLARICOR trial

    DEFF Research Database (Denmark)

    Hilden, Jørgen; Lind, Inga; Kolmos, Hans Jørn

    2010-01-01

    The association observed between coronary heart disease (CHD) and Chlamydia (Chlamydophila) pneumoniae antibodies prompted, during the 1990s, several primary and secondary prevention trials with various antibiotics. In our CLARICOR trial, a randomized placebo-controlled trial in 4372 patients...... with stable CHD, a brief clarithromycin regimen was followed, unexpectedly, by increased long-term mortality. We now compare C. pneumoniae antibody levels at entry with population levels, with the patients' individual histories, and with their subsequent outcomes. IgG antibody levels were somewhat raised...

  4. Pichia pastoris-expressed dengue 3 envelope-based virus-like particles elicit predominantly domain III-focused high titer neutralizing antibodies.

    Science.gov (United States)

    Tripathi, Lav; Mani, Shailendra; Raut, Rajendra; Poddar, Ankur; Tyagi, Poornima; Arora, Upasana; de Silva, Aravinda; Swaminathan, Sathyamangalam; Khanna, Navin

    2015-01-01

    Dengue poses a serious public health risk to nearly half the global population. It causes ~400 million infections annually and is considered to be one of the fastest spreading vector-borne diseases. Four distinct serotypes of dengue viruses (DENV-1, -2, -3, and -4) cause dengue disease, which may be either mild or extremely severe. Antibody-dependent enhancement (ADE), by pre-existing cross-reactive antibodies, is considered to be the major mechanism underlying severe disease. This mandates that a preventive vaccine must confer simultaneous and durable immunity to each of the four prevalent DENV serotypes. Recently, we used Pichia pastoris, to express recombinant DENV-2 E ectodomain, and found that it assembled into virus-like particles (VLPs), in the absence of prM, implicated in the elicitation of ADE-mediating antibodies. These VLPs elicited predominantly type-specific neutralizing antibodies that conferred significant protection against lethal DENV-2 challenge, in a mouse model. The current work is an extension of this approach to develop prM-lacking DENV-3 E VLPs. Our data reveal that P. pastoris-produced DENV-3 E VLPs not only preserve the antigenic integrity of the major neutralizing epitopes, but also elicit potent DENV-3 virus-neutralizing antibodies. Further, these neutralizing antibodies appear to be exclusively directed toward domain III of the DENV-3 E VLPs. Significantly, they also lack discernible ADE potential toward heterotypic DENVs. Taken together with the high productivity of the P. pastoris expression system, this approach could potentially pave the way toward developing a DENV E-based, inexpensive, safe, and efficacious tetravalent sub-unit vaccine, for use in resource-poor dengue endemic countries.

  5. Effect of adding crushed Pimpinella anisum, Nigella sativa seeds and Thymus vulgaris mixture to antibiotics-free rations of vaccinated and non-vaccinated male broilers on growth performance, antibody titer and haematological profile

    Directory of Open Access Journals (Sweden)

    Mamoun Z. Athamneh

    2010-04-01

    Full Text Available This research explores an experimental study conducted to investigate the effect of crushed Pimpinella anisum (PA, Nigella sativa (NS seeds and Thymus vulgaris (TV mixture as a feed additive on growth performance and mortality rate (MR, selected antibodies titer (Ab’s and blood hematological profile of vaccinated and non-vaccinated Lohman male broiler chicks fed free-antibiotics ration. A total of 400 one-day old chicks were distributed into 16 groups (4 treatment x 4 replicates x 25chicks. The experiment lasted from one to 42 days of age. The statistical findings of this experiment prove that the use of medicinal plants mixture improves live body weight, body weight gain, feed conversion ratio and MR of vaccinated male broilers at 21 and 42 days of age. antibodies titer against infectious bronchitis and infectious bursal disease of non-vaccinated and vaccinated male broilers were significantly improved at 21 and 42 days as a result of the addition of medicinal plant mixture to the basal ration. Concerning Newcastle disease, the use of PA, NS and TV mixture did not reflect in any additional improvement of Ab's than vaccines did. The addition of medicinal plants mixture increases WBC's, RBC's, thrombocytes count and Hb concentration of vaccinated and non-vaccinated male broilers at 21 days of age. Meanwhile, heterophils, lymphocytes and monocytes of vaccinated male broilers (VMB were significantly improved by adding medicinal plant mixture to their basal diet. Moreover, at 42 days of age the use of PA, NS seeds and TV mixture indicate significant increase in total WBC’s, lymphocytes and monocytes and monocytes count of VMB and non-vaccinated male broiler (NVMB. No significant differences were noticed in RBC’s and Hct as a result of feeding crushed medicinal plants mixture.

  6. Efek Pemberian Ekstrak Jaloh Dikombinasi dengan Probiotik dan Kromium Terhadap Profil Hematologi dan Titer Antibodi Vaksin ND pada Ayam Broiler yang Mengalami Stres Panas

    Directory of Open Access Journals (Sweden)

    Sugito Sugito

    2011-10-01

    Full Text Available The effect of jaloh extract combined with probiotic and chromium on the haematology profiles and ND antibody vaccine of broiler given heat stress ABSTRACT. The purpose of this study is to determine the respons of chicken broiler under heat stress that given drinking water contained extract jaloh combined with probiotic and Cr mineral in the profile of haematology and antibody respons of Newcastle Disease vaccine. Twenty four of 20-day old Cobb broiler chickens were randomly assigned and devided to 6 treatment groups. Completely randomized design was used in this study. The treatments were as follows: 1 chickens under heat stress, given jaloh extract, probiotic, and chromium (P1; 2. chickens under heat stress, given jaloh extract and probiotic (P2; 3. chickens under heat stress, given jaloh extract and chromium (P3; chickens under heat stress, given jaloh extract (P4; 5. chickens under heat stress without given jaloh extract nor chromium and probiotic (P5; and 6. chickens given no heat stress and jaloh extract nor chromium and probiotic (P6. Extract jaloh dose applied is 1.000 mg/lt water, dose of probiotic is 108 cfu/lt drinking water, and chromium given in the form of chloride chromium with dose 1000 ug/lt water. Local heat stress is provided by increasing cage temperature to the range of 33.0 ± 1°C during 5 hours per day u within 15 days. Jaloh extract, probiotic, and chromium treatments in drinking water were given at 2 hour before cage temperature reaching 33 ± 1oC and were stopped being given after 1 hour, when cage temperature back to room temperature. Blood was taken before chickens were ethanuatiated. The result suggested that giving jaloh extract to combine it with probiotic, and chromium has no significant effect in hematology profile. When combined extract jaloh with chromium (Cr, has potencial capability to stimulate improvement built of antibody (as immunomodulator on broiler chicken heat stress.

  7. Immunization of female cynomolgus macaques with a synthetic epitope of sperm-specific lactate dehydrogenase results in high antibody titers but does not reduce fertility.

    Science.gov (United States)

    Tollner, T L; Overstreet, J W; Branciforte, D; Primakoff, P D

    2002-06-01

    Previous studies have reported reduced fertility in female baboons immunized with a synthetic peptide derived from the sperm-specific isozyme of lactate dehydrogenase (LDH-C). In this study, a similar approach was used to immunize female cynomolgus macaques with the same peptide sequence (bC5-19) conjugated to a T-cell epitope from tetanus toxin (TT). Twelve female monkeys were immunized with bC5-19:TT delivered with Ribi MPL adjuvant vehicle, and 10 control female monkeys were injected with the adjuvant vehicle only. All 12 females in the treatment group developed LDH-C-specific serum antibodies as measured by ELISA, but anti-LDH-C antibodies were not detected in vaginal fluids of the immunized animals. After 4 months of timed mating immediately following the immunizations, five of the ten immunized females became pregnant, as did six of the ten control females. Anti-sera from both pregnant and nonpregnant bC5-19:TT-immunized females recognize a single band at 35 kDa on Western blots of whole sperm extracts, and purified Igs from the same sera localize along the principle piece of the flagellum of permeabilized sperm. Copyright 2002 Wiley-Liss, Inc.

  8. Decline in titers of anti-idiotypic antibodies specific to autoantibodies to GAD65 (GAD65Ab precedes development of GAD65Ab and type 1 diabetes.

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    Helena Elding Larsson

    Full Text Available The humoral Idiotypic Network consisting of antibodies and their anti-idiotypic antibodies (anti-Id can be temporarily upset by antigen exposure. In the healthy immune response the original equilibrium is eventually restored through counter-regulatory mechanisms. In certain autoimmune diseases however, autoantibody levels exceed those of their respective anti-Id, indicating a permanent disturbance in the respective humoral Idiotypic Network. We investigated anti-Id directed to a major Type 1 diabetes (T1D-associated autoantibody (GAD65Ab in two independent cohorts during progression to disease. Samples taken from participants of the Natural History Study showed significantly lower anti-Id levels in individuals that later progressed to T1D compared to non-progressors (anti-Id antibody index of 0.06 vs. 0.08, respectively, p = 0.02. We also observed a significant inverse correlation between anti-Id levels and age at sampling, but only in progressors (p = 0.014. Finally, anti-Id levels in progressors showed a significant decline during progression as compared to longitudinal anti-Id levels in non-progressors (median rate of change: -0.0004 vs. +0.0004, respectively, p = 0.003, suggesting a loss of anti-Id during progression. Our analysis of the Diabetes Prediction in Skåne cohort showed that early in life (age 2 individuals at risk have anti-Id levels indistinguishable from those in healthy controls, indicating that low anti-Id levels are not an innate characteristic of the immune response in individuals at risk. Notably, anti-Id levels declined significantly in individuals that later developed GAD65Ab suggesting that the decline in anti-Id levels precedes the emergence of GAD65Ab (median rate of change: -0.005 compared to matched controls (median rate of change: +0.001 (p = 0.0016. We conclude that while anti-Id are present early in life, their levels decrease prior to the appearance of GAD65Ab and to the development of T1D.

  9. Efficacy of a parainfluenza virus 5 (PIV5-based H7N9 vaccine in mice and guinea pigs: antibody titer towards HA was not a good indicator for protection.

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    Zhuo Li

    Full Text Available H7N9 has caused fatal infections in humans. A safe and effective vaccine is the best way to prevent large-scale outbreaks in the human population. Parainfluenza virus 5 (PIV5, an avirulent paramyxovirus, is a promising vaccine vector. In this work, we generated a recombinant PIV5 expressing the HA gene of H7N9 (PIV5-H7 and tested its efficacy against infection with influenza virus A/Anhui/1/2013 (H7N9 in mice and guinea pigs. PIV5-H7 protected the mice against lethal H7N9 challenge. Interestingly, the protection did not require antibody since PIV5-H7 protected JhD mice that do not produce antibody against lethal H7N9 challenge. Furthermore, transfer of anti-H7 serum did not protect mice against H7N9 challenge. PIV5-H7 generated high HAI titers in guinea pigs, however it did not protect against H7N9 infection or transmission. Intriguingly, immunization of guinea pigs with PIV5-H7 and PIV5 expressing NP of influenza A virus H5N1 (PIV5-NP conferred protection against H7N9 infection and transmission. Thus, we have obtained a H7N9 vaccine that protected both mice and guinea pigs against lethal H7N9 challenge and infection respectively.

  10. Novel Epstein-Barr virus-like particles incorporating gH/gL-EBNA1 or gB-LMP2 induce high neutralizing antibody titers and EBV-specific T-cell responses in immunized mice.

    Science.gov (United States)

    Perez, Elizabeth M; Foley, Joslyn; Tison, Timelia; Silva, Rute; Ogembo, Javier Gordon

    2017-03-21

    Previous Epstein-Barr virus (EBV) prophylactic vaccines based on the major surface glycoprotein gp350/220 as an immunogen have failed to block viral infection in humans, suggesting a need to target other viral envelope glycoproteins. In this study, we reasoned that incorporating gH/gL or gB, critical glycoproteins for viral fusion and entry, on the surface of a virus-like particle (VLP) would be more immunogenic than gp350/220 for generating effective neutralizing antibodies to prevent viral infection of both epithelial and B cell lines. To boost the humoral response and trigger cell-mediated immunity, EBV nuclear antigen 1 (EBNA1) and latent membrane protein 2 (LMP2), intracellular latency proteins expressed in all EBV-infected cells, were also included as critical components of the polyvalent EBV VLP. gH/gL-EBNA1 and gB-LMP2 VLPs were efficiently produced in Chinese hamster ovary cells, an FDA-approved vehicle for mass-production of biologics. Immunization with gH/gL-EBNA1 and gB-LMP2 VLPs without adjuvant generated both high neutralizing antibody titers in vitro and EBV-specific T-cell responses in BALB/c mice. These data demonstrate that will be invaluable not only in preventing EBV infection, but importantly, in preventing and treating the 200,000 cases of EBV-associated cancers that occur globally every year.

  11. Protein A chromatography at high titers.

    Science.gov (United States)

    Natarajan, Venkatesh; Zydney, Andrew L

    2013-09-01

    The large increase in antibody titers over the past two decades has created significant challenges for downstream processes; however, there have been no quantitative studies of the effect of feed concentration on the dynamic binding capacity in Protein A chromatography. Small scale experiments were performed using pre-packed ProSep® Ultra Plus columns over a range of feed flow rates and antibody concentrations. The data clearly demonstrate that the dynamic binding capacity decreases with increasing concentration of the monoclonal antibody at short residence times. This reduction in DBC is due to non-equilibrium mass transfer effects in the porous resin, with the experimental results consistent with predictions of a simple mathematical model based on a linear driving force with solid phase diffusion. These results provide important insights into the behavior of Protein A chromatography and provide a framework for the proper design of Protein A capture steps for high titer products. Copyright © 2013 Wiley Periodicals, Inc.

  12. Effects of different levels of hemp seed (Cannabis sativa L. and dextran oligosaccharide on growth performance and antibody titer response of broiler chickens

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    Mohammad Mahmoudi

    2015-03-01

    Full Text Available A total of 384 Ross 308 male broilers were used in a randomised complete design for a period of six weeks. The experiment was conducted as a 4×2 factorial arrangement with 4 levels of hemp seed (HS (0, 25, 50 and 75 g/kg and 2 levels of dextran oligossacharide (DOS (0 and 1 g/kg. Each of the 8 dietary treatments was fed to 4 replicate pens (12 birds/pen from 1 to 42 d of age. The results indicated that diets containing 25 g/kg HS caused significant decrease in average daily feed intake and average daily gain (ADG, whereas total serum cholesterol, low and very low density lipoprotein, and TG levels was minimised at 75 g/kg of HS, but serum high density lipoprotein (HDL was increased with increasing HS levels (P<0.01. Addition of 1 g/kg DOS diets compared with control diet, significantly increased ADG and HDL, and improved feed conversion ratio (P<0.05. Dietary DOS and HS had no significant effect on complete blood count, antibody production and relative weight of bursa and spleen in broilers (P>0.05. In conclusion, dietary HS and DOS can be used at their highest levels tested in the present study (75 g/kg of HS+1 g/kg of DOS to decrease lipid levels of blood serum in broilers without any negative effect on performance.

  13. Sensitivity and specificity of indirect ELISA for the detection of antibody titers against BVDV from beef cattle raised in Pará State

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    Rinaldo Batista Viana

    2017-10-01

    Full Text Available The aims of this study were to establish the prevalence of anti-bovine viral diarrhea virus (BVDV antibodies (Ab in beef cattle raised in Pará state, to compare the prevalence of seropositive animals to BVDV using a commercial indirect enzyme-linked immunosorbent assay kit (iELISA and the virus neutralization (VN test, and finally, to determine the sensitivity (Se and specificity (Sp of the iELISA for the detection of anti-BVDV Ab using VN as a gold standard. A total of 400 serum blood samples from Nelore cows aged at least 24 months from five farms in the Pará state from two mesoregions (Metropolitan Region of Belem and Northeast of Pará were analyzed. All animals were vaccinated against brucellosis and foot-and-mouth disease. The examination of anti-BVDV Ab with VN was performed in the Laboratory of Bovine Viruses of the Biological Institute of Sao Paulo as described in the Manual of Diagnostic Tests and Vaccines for Terrestrial Animals. For VN, bovine kidney epithelial cells from the Madin Darby Bovine Kidney (MDBK strain were used. The determinations of anti-BVDV Ab were performed with the iELISA test at the Laboratory of Immunology and Microbiology of the Federal Rural University of Amazonia according to the manufacturer's recommendations. The results were classified as follows: (a correct positive diagnosis, (b incorrect positive diagnosis, (c correct negative diagnosis, and (d incorrect negative diagnosis, according to the results obtained from VN. From the values obtained from VN and iELISA, Se [(a ÷ a + d × 100], Sp [(c ÷ c + b × 100], positive predictive value [(a ÷ a + B × 100], and negative predictive value [(c ÷ c + d × 100] were calculated for iELISA. The frequencies (% of seropositive animals were determined and compared both between the different tests (iELISA and VN and between the different farms (1, 2, 3, 4, and 5. The statistical analysis was performed with a significance level of 5%. The prevalence of seropositive

  14. MF59- and Al(OH)3-Adjuvanted Staphylococcus aureus (4C-Staph) Vaccines Induce Sustained Protective Humoral and Cellular Immune Responses, with a Critical Role for Effector CD4 T Cells at Low Antibody Titers

    Science.gov (United States)

    Monaci, Elisabetta; Mancini, Francesca; Lofano, Giuseppe; Bacconi, Marta; Tavarini, Simona; Sammicheli, Chiara; Arcidiacono, Letizia; Giraldi, Monica; Galletti, Bruno; Rossi Paccani, Silvia; Torre, Antonina; Fontana, Maria Rita; Grandi, Guido; de Gregorio, Ennio; Bensi, Giuliano; Chiarot, Emiliano; Nuti, Sandra; Bagnoli, Fabio; Soldaini, Elisabetta; Bertholet, Sylvie

    2015-01-01

    Staphylococcus aureus (S. aureus) is an important opportunistic pathogen that may cause invasive life-threatening infections, like sepsis and pneumonia. Due to the increasing antibiotic resistance, the development of an effective vaccine against S. aureus is needed. Although a correlate of protection against staphylococcal diseases is not yet established, several findings suggest that both antibodies and CD4 T cells might contribute to optimal immunity. In this study, we show that adjuvanting a multivalent vaccine (4C-Staph) with MF59, an oil-in-water emulsion licensed in human vaccines, further potentiated antigen-specific IgG titers and CD4 T-cell responses compared to alum and conferred protection in the peritonitis model of S. aureus infection. Moreover, we showed that MF59- and alum-adjuvanted 4C-Staph vaccines induced persistent antigen-specific humoral and T-cell responses, and protected mice from infection up to 4 months after immunization. Furthermore, 4C-Staph formulated with MF59 was used to investigate which immune compartment is involved in vaccine-induced protection. Using CD4 T cell-depleted mice or B cell-deficient mice, we demonstrated that both T and B-cell responses contributed to 4C-Staph vaccine-mediated protective immunity. However, the role of CD4 T cells seemed more evident in the presence of low-antibody responses. This study provides preclinical data further supporting the use of the adjuvanted 4C-Staph vaccines against S. aureus diseases, and provides critical insights on the correlates of protective immunity necessary to combat this pathogen. PMID:26441955

  15. MF59- and Al(OH3-adjuvanted Staphylococcus aureus (4C-Staph vaccines induce sustained protective humoral and cellular immune responses, with a critical role for effector CD4 T cells at low antibody titers.

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    Elisabetta eMonaci

    2015-09-01

    Full Text Available Staphylococcus aureus (S. aureus is an important opportunistic pathogen that may cause invasive life-threatening infections like sepsis and pneumonia. Due to increasing antibiotic-resistance, the development of an effective vaccine against S. aureus is needed. Although a correlate of protection against staphylococcal diseases is not yet established, several findings suggest that both antibodies and CD4 T cells might contribute to optimal immunity. In this study, we show that adjuvanting a multivalent vaccine (4C-Staph with MF59, an oil-in-water emulsion licensed in human vaccines, further potentiated antigen-specific IgG titers and CD4 T cell responses compared to alum and conferred protection in the peritonitis model of S. aureus infection. Moreover, we showed that MF59- and alum-adjuvanted 4C-Staph vaccines induced persistent antigen-specific humoral and T cell responses, and protected mice from infection up to 4 months after immunization. Furthermore, 4C-Staph formulated with MF59 was used to investigate which immune compartment is involved in vaccine-induced protection. Using CD4 T cell-depleted mice or B cell deficient mice, we demonstrated that both T and B cell responses contributed to 4C-Staph vaccine-mediated protective immunity. However, the role of CD4 T cells seemed more evident in the presence of low antibody responses. This study provides preclinical data further supporting the use of the adjuvanted 4C-Staph vaccines against S. aureus diseases, and provides critical insights on the correlates of protective immunity necessary to combat this pathogen.

  16. A vertically discretised canopy description for ORCHIDEE (SVN r2290) and the modifications to the energy, water and carbon fluxes

    Science.gov (United States)

    Naudts, K.; Ryder, J.; McGrath, M. J.; Otto, J.; Chen, Y.; Valade, A.; Bellasen, V.; Berhongaray, G.; Bönisch, G.; Campioli, M.; Ghattas, J.; De Groote, T.; Haverd, V.; Kattge, J.; MacBean, N.; Maignan, F.; Merilä, P.; Penuelas, J.; Peylin, P.; Pinty, B.; Pretzsch, H.; Schulze, E. D.; Solyga, D.; Vuichard, N.; Yan, Y.; Luyssaert, S.

    2015-07-01

    Since 70 % of global forests are managed and forests impact the global carbon cycle and the energy exchange with the overlying atmosphere, forest management has the potential to mitigate climate change. Yet, none of the land-surface models used in Earth system models, and therefore none of today's predictions of future climate, accounts for the interactions between climate and forest management. We addressed this gap in modelling capability by developing and parametrising a version of the ORCHIDEE land-surface model to simulate the biogeochemical and biophysical effects of forest management. The most significant changes between the new branch called ORCHIDEE-CAN (SVN r2290) and the trunk version of ORCHIDEE (SVN r2243) are the allometric-based allocation of carbon to leaf, root, wood, fruit and reserve pools; the transmittance, absorbance and reflectance of radiation within the canopy; and the vertical discretisation of the energy budget calculations. In addition, conceptual changes were introduced towards a better process representation for the interaction of radiation with snow, the hydraulic architecture of plants, the representation of forest management and a numerical solution for the photosynthesis formalism of Farquhar, von Caemmerer and Berry. For consistency reasons, these changes were extensively linked throughout the code. Parametrisation was revisited after introducing 12 new parameter sets that represent specific tree species or genera rather than a group of often distantly related or even unrelated species, as is the case in widely used plant functional types. Performance of the new model was compared against the trunk and validated against independent spatially explicit data for basal area, tree height, canopy structure, gross primary production (GPP), albedo and evapotranspiration over Europe. For all tested variables, ORCHIDEE-CAN outperformed the trunk regarding its ability to reproduce large-scale spatial patterns as well as their inter

  17. Poor serologic responses five to seven years after immunization with high and standard titer measles vaccines.

    Science.gov (United States)

    Whittle, H; Aaby, P; Samb, B; Cissé, B; Kanteh, F; Soumaré, M; Jensen, H; Bennett, J; Simondon, F

    1999-01-01

    Few data exist on the persistence of measles antibodies after vaccination of West African infants. Therefore we examined measles antibody titers 5 to 7 years after children in rural Senegal had received high titer Edmonston-Zagreb (EZ-HT), high titer Schwarz (SW-HT) or standard titer Schwarz (SW-STD) measles vaccines in infancy. Children had received either high titer vaccines at 5 months of age or standard titer at 10 months of age. Finger prick blood samples were tested for measles antibody 5 to 7 years later by the hemagglutinin inhibition test. Persistence of antibody after high titer vaccines was poor with the result that 39 and 50% of the EZ-HT and the SW-HT groups had low titers of hemagglutinin inhibition measles antibodies (125 mIU/ml) in West Africa. The role of subclinical boosting by exposure to natural measles and the possible role of malaria, which increases immunoglobulin turnover, in influencing long term antibody persistence after vaccination deserve further investigation.

  18. Antibody

    Science.gov (United States)

    An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples ... microorganisms (bacteria, fungi, parasites, and viruses) and chemicals. Antibodies may be produced when the immune system mistakenly ...

  19. Whooping crane titers to eastern equine encephalitis vaccinations

    Science.gov (United States)

    Olsen, G.H.; Kolski, E.; Hatfield, J.S.; Docherty, D.E.; Chavez-Ramirez, Felipe

    2005-01-01

    In 1984 an epizootic of eastern equine encephalitis (EEE) virus killed 7 of 39 (18%) whooping cranes in captivity at the Patuxent Wildlife Research Center in Laurel, Maryland, USA. Since that time whooping cranes have been vaccinated with a human EEE vaccine. This vaccine was unavailable for several years, necessitating use of an equine vaccine in the cranes. This study compared the antibody titers measured for three years using the human vaccine with those measured for two years using the equine form. Whooping cranes developed similarly elevated titers in one year using the human vaccine and both years using the equine vaccine. However, in two years where the human vaccine was used, the whooping cranes developed significantly lower titers compared to other years.

  20. Antibody titers against Newcastle disease virus in three different poultry management systems located in Feira de Santana – Bahia Títulos de anticorpos contra o vírus da doença de Newcastle em três diferentes sistemas de criação avícola na região de Feira de Santana-Bahia

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    Priscila Sousa da Silva

    2007-12-01

    Full Text Available Serum samples were collected from poultry bred in integrated, independent and backyard production system, in Feira de Santana – Bahia, for evaluation of antibodies against Newcastle Disease virus. Samples were obtained from day-old chicks, slaughter poultry and backyard chickens ranging from four months to three years of age. Serum was analyzed by a commercial indirect ELISA. Results demonstrated that one day old chicks presented high antibodies titers with coefficient of variation of 33.03%, because their mothers were vaccinated. Poultry from integrated and independent producers presented higher variation coefficient, 99.07% and 97.01%, respectively, demonstrating no uniformity in titers, due to the lack of a good vaccinal response against Newcastle disease virus. The occurrence of high antibody titers was observed in backyard chickens, and coefficient of variation of 146.41%, demonstrating the lack of vaccinal response. This data suggest that the studied commercial poultry is not well immunised by vaccination. Moreover, the presence of backyard chickens with evidence of high antibodies titers, suggests that they can become a threat to industrial poultry.Amostras de soro foram coletadas de aves criadas em sistema de produção integrado, sistema independente e de galinhas de fundo de quintal, na região de Feira de Santana – Bahia, para avaliação dos títulos de anticorpos contra o vírus da Doença de Newcastle. Foram obtidas amostras de pintos de um dia, frangos de corte em idade de abate e galinhas de fundo de quintal com idades variando de quatro meses até três anos. Os soros foram analisados por meio de ELISA indireto, utilizando-se kit comercial. Os resultados obtidos demonstraram que os pintos de um dia apresentaram alto título de anticorpos maternos, provenientes das matrizes vacinadas, com coeficiente de variação de 33,03%. Os frangos de corte dos integrados e dos produtores independentes apresentaram um coeficiente de varia

  1. High titers of both rheumatoid factor and anti-CCP antibodies at baseline in patients with rheumatoid arthritis are associated with increased circulating baseline TNF level, low drug levels, and reduced clinical responses: a post hoc analysis of the RISING study.

    Science.gov (United States)

    Takeuchi, Tsutomu; Miyasaka, Nobuyuki; Inui, Takashi; Yano, Toshiro; Yoshinari, Toru; Abe, Tohru; Koike, Takao

    2017-09-02

    Although both rheumatoid factor (RF) and anticyclic citrullinated peptide antibodies (anti-CCP) are useful for diagnosing rheumatoid arthritis (RA), the impact of these autoantibodies on the efficacy of tumor necrosis factor (TNF) inhibitors has been controversial. The aim of this post hoc analysis of a randomized double-blind study (the RISING study) was to investigate the influences of RF and anti-CCP on the clinical response to infliximab in patients with RA. Methotrexate-refractory patients with RA received 3 mg/kg of infliximab from weeks 0 to 6 and then 3, 6, or 10 mg/kg every 8 weeks from weeks 14 to 46. In this post hoc analysis, patients were stratified into three classes on the basis of baseline RF/anti-CCP titers: "low/low-C" (RF < 55 IU/ml, anti-CCP < 42 U/ml), "high/high-C" (RF ≥ 160 IU/ml, anti-CCP ≥ 100 U/ml), and "middle-C" (neither low/low-C nor high/high-C). Baseline plasma TNF level, serum infliximab level, and disease activity were compared between the three classes. Baseline RF and anti-CCP titers showed significant correlations with baseline TNF and infliximab levels in weeks 2-14. Comparison of the three classes showed that baseline TNF level was lowest in the low/low-C group and highest in the high/high-C group (median 0.73 versus 1.15 pg/ml), that infliximab levels at week 14 were highest in the low/low-C group and lowest in the high/high-C group (median 1.0 versus 0.1 μg/ml), and that Disease Activity Score in 28 joints based on C-reactive protein at week 14 was lowest in the low/low-C group and highest in the high/high-C group (median 3.17 versus 3.82). A similar correlation was observed at week 54 in the 3 mg/kg dosing group, but not in the 6 or 10 mg/kg group. Significant decreases in both RF and anti-CCP were observed during infliximab treatment. RF/anti-CCP titers correlated with TNF level. This might explain the association of RF/anti-CCP with infliximab level and clinical response in patients with RA

  2. Measles, Mumps, and Rubella Titers in Air Force Recruits: Below Herd Immunity Thresholds?

    Science.gov (United States)

    Lewis, Paul E; Burnett, Daniel G; Costello, Amy A; Olsen, Cara H; Tchandja, Juste N; Webber, Bryant J

    2015-11-01

    Preventable diseases like measles and mumps are occurring with increasing frequency in the U.S. despite the availability of an effective vaccine. Given concern that an outbreak may occur among military recruits, we compared serologic evidence of immunity to measles, mumps, and rubella among military recruits with known herd immunity thresholds and determined whether the current Department of Defense policy of presuming mumps immunity based on measles and rubella titers is reliable. Serum antibody levels for measles, mumps, and rubella were obtained from all new recruits upon arrival at Joint Base San Antonio-Lackland, Texas, from 25 April 2013 through 24 April 2014. Seroprevalence of each disease was assessed by age and sex, and concordance between mumps titers and measles and rubella titers was calculated. Data analysis was performed in 2014-2015. Among 32,502 recruits, seroprevalences for measles, mumps, and rubella antibodies were 81.6%, 80.3%, and 82.1%, respectively. Of the 22,878 recruits seropositive for both measles and rubella antibodies, 87.7% were also seropositive for mumps. Seroprevalences for measles, mumps, and rubella antibodies among a large cohort of recruits entering U.S. Air Force basic training were generally lower than levels required to maintain herd immunity. In order to reduce the incidence of mumps infections, the Department of Defense should consider obtaining antibody titers for measles, mumps, and rubella and vaccinating all individuals susceptible to one or more of the viruses. Published by Elsevier Inc.

  3. Maternal titers after adequate syphilotherapy during pregnancy.

    Science.gov (United States)

    Rac, Martha W F; Bryant, Stefanie N; Cantey, Joseph B; McIntire, Donald D; Wendel, George D; Sheffield, Jeanne S

    2015-03-01

    We aimed to construct a timeline for nontreponemal titer decline specific to pregnancy and evaluate factors associated with inadequate decline by delivery. This was a retrospective medical records review from September 1984 to June 2011 of women diagnosed with syphilis after 18 weeks of gestation. Women were treated according to stage of syphilis per Centers for Disease Control and Prevention guidelines. Patients with both pretreatment and delivery titers were included for data analysis. Demographics, stage of syphilis, maternal titers, delivery, and infant outcomes were recorded. Standard statistical analyses were performed for categorical and continuous data. The titer decline was analyzed using mixed-effects regression modeling. A total of 166 patients met inclusion criteria. Mean gestational age at treatment was 29.1 ± 5 weeks, and 93 (56%) women were diagnosed with early-stage syphilis. For all stages of syphilis, maternal titers declined after syphilotherapy. Pretreatment titers were higher and declined more rapidly in primary and secondary disease than in latent-stage disease and syphilis of unknown duration. Sixty-three (38%) patients achieved a 4-fold decline by delivery. Patients without a 4-fold decline by delivery were older (24.6 vs 21.5 years; P syphilis or syphilis of unknown duration, and had less time from treatment to delivery (7.8 vs 11.1 weeks; P < .001). Maternal serologic response during pregnancy after adequate syphilotherapy varied by stage of disease. Failure to achieve a 4-fold decline in titers by delivery is more a reflection of treatment timing than of treatment failure. © The Author 2014. Published by Oxford University Press on behalf of the Infectious Diseases Society of America. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  4. SURVEI TITER ANTI BODI ANAK SEKOLAH USIA 6--17 TAHUN DI DAERAH KLB DIFTERI DAN NON KLB DI INDONESIA

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    Noer Endah Pracoyo

    2014-02-01

    Full Text Available AbstractDiphtheriae  is an  reemerging infectious disease  widespread in the world. Bacterial infection of Corynebacterium diphtheria usually not invasive, but the bacteria can produce toxins that cause pathological effects on the heart muscle and other organs, and a 10-17% death-risk was occurred.  Diphtheriae can be prevented by immunization.  Immunizations are given to infants at the age of 0-11 months and procead to booster for pupils at Elementary School. The imunization program at school is a routinely cunducted. Such program held annualy on certain month that called as “BIAS pupils immunization month” . To examine antibody  titer of diphtheriae, research for sero  survey titer antibody titer of diphtheriae was conducted on pupils between 6 and 17 years old at outbreak areas and non outbreak area.The research started in May 2010 and finished in Desember 2010. The aim of the research was to measure the antibody titer in area of outbreak and non outbreak of school children. Design was case control study. Sera of the respondens were axamined by Elisa for detecting antibody titers against diphtheriae. The study awarded ethical clearence from Research Ethics Committee of the National Institute of Health Research and Developmnent. Number of sample cases were 225 samples and 225 control. Analysis of the data by using the soft ware (SPSS 16.00. The result of this research were respondens who lived in the outbreak area with risk of dipthteriae infection of 2,3 times than respondens who lived in the non outbreak area. The immunization of diphthteriae more important for antibody titers.Keywords: Antibody titer diphtheriae, outbreak areaAbstrakDifteria adalah  penyakit infeksi Reemerging tersebar luas di dunia. Infeksi kuman Corynebacterium diphtheria  biasanya tidak invasif, tetapi kuman dapat memproduksi toksin yang dapat menimbulkan efek patologis pada otot jantung dan organ lain, dan berisiko terjadi kematian (10-17%. Difteri dapat

  5. Títulos de anticuerpos antisulfátido en pacientes con cardiopatía chagásica crónica y con otras formas de cardiopatía Antisulfatide antibody titers in patients with chronic Chagas heart disease and other forms of heart disease

    Directory of Open Access Journals (Sweden)

    Rando García

    1998-04-01

    ,0049, cardiopatía valvular reumática (P = 0,0075, cardiopatía isquémica crónica (P = 0,0464 y bradiarritmias (P = 0,0157, y valores significativamente bajos en sujetos con cardiopatía hipertensiva (P = 0,0367. Las concentraciones de dichos anticuerpos no se correlacionaron con variables clínicas o paraclínicas indicadoras del grado de afección cardíaca. Los resultados corroboran que los anticuerpos antisulfátido podrían desempeñar algún papel en la patogenia de la cardiomiopatía chagásica y de otras formas de cardiopatía y deben continuarse investigando hasta determinar su posible función en esos procesos.A specific treatment for Chagas' disease has not yet been discovered, even though the condition is endemic in large parts of the Region of the Americas. Earlier studies have addressed the possibility that the sulfatide galactocerebroside in Trypanosoma cruzi behaves as an immunogen involved in the production of the high antisulfatide antibody levels found in patients with chronic infestation with the parasite. This may be an important factor in the pathogenesis of the cardiac symptoms and peripheral neuropathy seen in Chagas' disease, which is the most important cause of myocarditis in Central and South America and the second most important cause of heart failure in several of the countries located in these subregions. The present study was conducted in order to ascertain whether patients with Chagas' disease and other patients not afflicted with the ailment differ insofar as the presence of antibodies against sulfatide is concerned, and it describes antisulfatide antibody levels in 124 hospital patients (74 men and 50 women between the ages of 15 and 94 who were in the cardiology unit of Vargas Hospital in Caracas from 1 July to 30 June 1995. Antisulfatide antibody titers were determined by means of enzyme-linked immunosorbent assays (ELISA, and the antigen employed was sulfatide cerebroside obtained from bovine brain tissue. Of the 124 patients under study

  6. Recurrent Potent Human Neutralizing Antibodies to Zika Virus in Brazil and Mexico

    OpenAIRE

    Robbiani, Davide F.; Khouri, Ricardo; Gristick, Harry B.; Lee, Yu E.; West, Anthony P.; Bjorkman, Pamela J.

    2017-01-01

    Antibodies to Zika virus (ZIKV) can be protective. To examine the antibody response in individuals who develop high titers of anti-ZIKV antibodies, we screened cohorts in Brazil and Mexico for ZIKV envelope domain III (ZEDIII) binding and neutralization. We find that serologic reactivity to dengue 1 virus (DENV1) EDIII before ZIKV exposure is associated with increased ZIKV neutralizing titers after exposure. Antibody cloning shows that donors with high ZIKV neutralizing antibody titers have e...

  7. First Indian initiative for preparation of low-titer group “O” single-donor platelets with platelet additive solution

    Directory of Open Access Journals (Sweden)

    Puneet Jain

    2018-01-01

    Conclusion: O group SDPs can be prepared with PAS and the beneficial effects were significant with respect to antibody titers. Quality parameters were well maintained. Availability of PAS units has benefitted patients.

  8. Production of high-titer RCAS retrovirus.

    Science.gov (United States)

    Yan, Run-Tao; Wang, Shu-Zhen

    2012-01-01

    RCAS (B/P) is a replication-competent avian retrovirus engineered by Hughes et al. (J Virol 61:3004-3012, 1987) and is referred to in this chapter as RCAS for simplicity. The RCAS retrovirus has been widely used as a vehicle for stable transduction of a gene into cells both in the developing chick embryo and tissue/cell culture. It can be used for both gain- and loss-function experiments. The ability of this virus to spread among proliferating cells makes it possible to achieve widespread gene transduction in the developing retina. The transduction efficiency of RCAS is highly depending on the titer of the viral stock, particularly for experiments involving solid tissues such as the developing retina. Here, we describe the procedure that we have used for 15 years to generate RCAS viral stocks with a titer of 1-5 × 10(8) pfu/ml.

  9. Antithyroglobulin antibody

    Science.gov (United States)

    Thyroglobulin antibody; Thyroiditis - thyroglobulin antibody; Hypothyroidism - thyroglobulin antibody; Thyroiditis - thyroglobulin antibody; Graves disease - thyroglobulin antibody; Underactive thyroid - thyroglobulin antibody

  10. Delta inulin-derived adjuvants that elicit Th1 phenotype following vaccination reduces respiratory syncytial virus lung titers without a reduction in lung immunopathology.

    Science.gov (United States)

    Wong, Terianne M; Petrovsky, Nikolai; Bissel, Stephanie J; Wiley, Clayton A; Ross, Ted M

    2016-08-02

    Respiratory syncytial virus (RSV) is a significant cause of lower respiratory tract infections resulting in bronchiolitis and even mortality in the elderly and young children/infants. Despite the impact of this virus on human health, no licensed vaccine exists. Unlike many other viral infections, RSV infection or vaccination does not induce durable protective antibodies in humans. In order to elicit high titer, neutralizing antibodies against RSV, we investigated the use of the adjuvant Advax™, a novel polysaccharide adjuvant based on delta inulin microparticles, to enhance antibody titers following vaccination. BALB/c mice were vaccinated intramuscularly with live RSV as a vaccine antigen in combination with one of two formulations of Advax™. Advax-1 was comprised of the standard delta inulin adjuvant and Advax-2 was formulated delta inulin plus CpG oligodendronucleotides (ODNs). An additional group of mice were either mock vaccinated, immunized with vaccine only, or administered vaccine plus Imject Alum. Following 3 vaccinations, mice had neutralizing antibody titers that correlated with reduction in viral titers in the lungs. Advax-1 significantly enhanced serum RSV-specific IgG1 levels at week 6 indicative of a Th2 response, similar to titers in mice administered vaccine plus Imject Alum. In contrast, mice vaccinated with vaccine plus Advax-2 had predominately IgG2a titers indicative of a Th1 response that was maintained during the entire study. Interestingly, regardless of which Advax TM adjuvant was used, the neutralizing titers were similar between groups, but the viral lung titers were significantly lower (∼10E+3pfu/g) in mice administered vaccine with either Advax TM adjuvant compared to mice administered adjuvants only. The lung pathology in vaccinated mice with Advax TM was similar to Imject Alum. Overall, RSV vaccine formulated with Advax TM had high neutralizing antibody titers with low lung viral titers, but exacerbated lung pathology compared

  11. [Comparison of echocardiographic findings in AVS patients with and without high IgG, IgM, IgA titers against Chlamydia pneumoniae during 12 months' observation of AVS natural course].

    Science.gov (United States)

    Swierszcz, Jolanta; Dubiel, Jacek S; Krzysiek, Józef; Sztefko, Krystyna; Galicka-Latała, Danuta; Roman, Pfitzner; Podolec, Piotr; Wodniecki, Jan

    2011-01-01

    Comparison of echocardiographic findings in AVS patients with and without high IgG, IgM, IgA titers against Chlamydia pneumoniae during 12 months' observation of AVS natural course. 60 AVS patients who did not agree for operational treatment were divided into group A (30 patients with high IgG titer) group B (30 patients with low IgG titer), group C (22 patients with high IgA titer) group D (38 patients with low IgA titer), group E (7 patients with high IgM titer), group F (53 patients with low IgA titer) Antibodies titers and echocardiographic scans were carried out every 12 months. There were more (p right atrium diameter was higher in group E compared to group F. The results may suggest link between Chlamydia pneumoniae and deterioration of AVS.

  12. Effect of centrifugation and microagglutination techniques on Brucella agglutinin titers.

    OpenAIRE

    Klein, G C; Behan, K A; Brown, S L; Couch, E E

    1982-01-01

    The microagglutination technique without centrifugation was more effective than centrifugation of the standard tube test for increasing Brucella agglutinin titers of specimens with a titer greater than or equal to 160 but was less effective than centrifugation of the standard tube test for specimens with a titer less than 160.

  13. Precipitating antibodies in mycoplasma infection.

    Science.gov (United States)

    Menonna, J; Chmel, H; Menegus, M; Dowling, P; Cook, S

    1977-01-01

    The effectiveness of counterimmunoelectrophoresis (CIEP) for detecting human precipitating antibodies to mcyoplasma antigen was compared with the conventional complement fixation (CF) method in a double-blind experiment. Fifty-one sera from patients suspected of having acute mycoplasma infection were tested by both techniques. Dense precipitin lines to mycoplasma antigen developed in 28 sera with CIEP. Twenty-six of 28 had elevated CF titers to this antigen. No precipitin bands were observed in sera with low antibody titers to mycoplasma. These findings indicate that the CIEP test is a specific method for reliably detecting elevated serum CF antibody levels in patients with acute or recent mycoplasma infection. PMID:328527

  14. Definition and dynamic control of a continuous chromatography process independent of cell culture titer and impurities.

    Science.gov (United States)

    Chmielowski, Rebecca A; Mathiasson, Linda; Blom, Hans; Go, Daniel; Ehring, Hanno; Khan, Heera; Li, Hong; Cutler, Collette; Lacki, Karol; Tugcu, Nihal; Roush, David

    2017-12-01

    Advances in cell culture technology have enabled the production of antibody titers upwards of 30g/L. These highly productive cell culture systems can potentially lead to productivity bottlenecks in downstream purification due to lower column loadings, especially in the primary capture chromatography step. Alternative chromatography solutions to help remedy this bottleneck include the utilization of continuous processing systems such as periodic counter-current chromatography (PCC). Recent studies have provided methods to optimize and improve the design of PCC for cell culture titers up to about 3g/L. This paper defines a continuous loading strategy for PCC that is independent of cell culture background and encompasses cell culture titers up to about 31g/L. Initial experimentation showed a challenge with determining a difference in change in UV280nm signal (ie. ΔUV) between cell culture feed and monoclonal antibody (mAb) concentration. Further investigation revealed UV280nm absorbance of the cell culture feedstock without antibody was outside of the linear range of detection for a given cell pathlength. Additional experimentation showed the difference in ΔUV for various cell culture feeds can be either theoretically predicted by Beer's Law given a known absorbance of the media background and impurities or experimentally determined using various UV280nm cell pathlengths. Based on these results, a 0.35mm pathlength at UV280nm was chosen for dynamic control to overcome the background signal. The pore diffusion model showed good agreement with the experimental frontal analysis data, which resulted in definition of a ΔUV setpoint range between 20 and 70% for 3C-PCC experiments. Product quality of the elution pools was acceptable between various cell culture feeds and titers up to about 41g/L. Results indicated the following ΔUV setpoints to achieve robust dynamic control and maintain 3C-PCC yield: ∼20-45% for titers greater than 10g/L depending on UV absorbance of

  15. Titulação de anticorpos contra o vírus da raiva em cães, em Campo Grande, MS, na Campanha Anti-Rábica de 2003 Rabies virus antibody titers in dogs in Campo Grande, Mato Grosso do Sul State, during the anti-rabies campaign, 2003

    Directory of Open Access Journals (Sweden)

    Leonardo Rigo

    2006-12-01

    Full Text Available Para avaliar a resposta imune em cães, que compareceram a Campanha de Vacinação Anti-Rábica Animal de 2003, foram analisados 333 soros caninos, coletados nos diversos postos de vacinação. Verificou-se que 51,1% dos animais não possuíam títulos protetores. Não foi encontrada associação entre aplicação de vacina e maior número de vacinações, com maior título imunitário.To assess the immune response in dogs attended during the 2003 anti-rabies animal vaccination campaign, 333 serum samples collected at different vaccination posts were analyzed. It was found that 51.1% of the animals did not have protective titers. No correlation was found between vaccine application or multiple vaccinations and higher immune titers.

  16. Minimal variation in anti-A and -B titers among healthy volunteers over time: Implications for the use of out-of-group blood components.

    Science.gov (United States)

    Sprogøe, Ulrik; Yazer, Mark H; Rasmussen, Mads Hvidkjær; Antonsen, Berit; Bistrup, Claus; Assing, Kristian

    2017-06-01

    Using potentially out-of-group blood components, like low titer A plasma and O whole blood, in the resuscitation of trauma patients is becoming increasingly popular. However, very little is known whether the donors' anti-A and/or anti-B titers change over time and whether repeated titer measurements on the same donor are required to ensure that each donation produces a low titer product. The anti-A and/or anti-B titers were measured on 56 healthy adult volunteers (47 blood donors; nine blood center personnel) every 3 months for 12 consecutive months using an automated solid phase analyzer. The results were expressed as log2 titer steps (e.g., titer 32 = 5 titer steps). Minor variations in the average anti-A and/or anti-B titers were seen over time; the maximum individual SD in each group was 1.50 (IgG anti-A) or 1.00 (IgM anti-A, IgM, and IgG anti-B). When the SDs for the four titer measurements from all 56 volunteers were combined as appropriate, the highest overall combined SD was 0.47 titer steps for IgG anti-A. This value corresponds to a 95% confidence interval for intraindividual variation in this antibody's titer over 12 months of 0.96 titer steps. Thus, based on one measurement, an IgG anti-A with a titer step of, for example, 6 would be expected to be in the range of titer step 5 to titer step 7 over the course of 1 year with 95% probability. The titers of anti-A and/or anti-B among healthy adults are stable over at least 1 year. This suggests that repeated titer measurements within a year on the same donor are not necessary if donations are made at 3 months or longer intervals. Diagnostic study, level V.

  17. Influence of Acyclovir on Antibody Production of Antibody to Chickenpox

    OpenAIRE

    Atsutoshi, Tsuji; Takayoshi, Tsuchiya; Yuuko, Nagaoka; Toshiro, Nagai; Department of Pediatrics, Saitama Municipal Hospital; College of Health Professions, Toho University; Department of Pediatrics, Dokkyo University, Koshigaya Hospital

    2003-01-01

    Titers of immunoglobulin (Ig) G and 1gM antibody to varicella zoster virus (VZV) were measured in 20 pediatric patients with chickenpox during treatment with acyclovir, an antiviral agent. Acyclovir doses, each 80 mg/kg/day, were administered for 5 days, beginning within 4 days after the onset of the rash. All patients displayed positive IgG and/or 1gM anti-VZV antibodies. No significant difference was noted in the IgG (p = 0.417) or IgM titer (p = 0.846) between patients treated within 24 ho...

  18. Avian Diagnostic and Therapeutic Antibodies to Viral Emerging Pathogens

    Energy Technology Data Exchange (ETDEWEB)

    David Bradley

    2011-03-31

    During the current period the following key objectives were achieved: demonstration of high titer antibody production by geese following immunization with inactived H1N1 virus; completion of the epitope mapping of West Nile Virus-specific goose antibodies and initiation of epitope mapping of H1N1 flu-specific goose antibodies; advancement in scalable purification of goose antibodies.

  19. The impact of host diet on Wolbachia titer in Drosophila.

    Directory of Open Access Journals (Sweden)

    Laura R Serbus

    2015-03-01

    Full Text Available While a number of studies have identified host factors that influence endosymbiont titer, little is known concerning environmental influences on titer. Here we examined nutrient impact on maternally transmitted Wolbachia endosymbionts in Drosophila. We demonstrate that Drosophila reared on sucrose- and yeast-enriched diets exhibit increased and reduced Wolbachia titers in oogenesis, respectively. The yeast-induced Wolbachia depletion is mediated in large part by the somatic TOR and insulin signaling pathways. Disrupting TORC1 with the small molecule rapamycin dramatically increases oocyte Wolbachia titer, whereas hyper-activating somatic TORC1 suppresses oocyte titer. Furthermore, genetic ablation of insulin-producing cells located in the Drosophila brain abolished the yeast impact on oocyte titer. Exposure to yeast-enriched diets altered Wolbachia nucleoid morphology in oogenesis. Furthermore, dietary yeast increased somatic Wolbachia titer overall, though not in the central nervous system. These findings highlight the interactions between Wolbachia and germline cells as strongly nutrient-sensitive, and implicate conserved host signaling pathways by which nutrients influence Wolbachia titer.

  20. New principle for the simultaneous detection of total and immunoglobulin M antibodies applied to the measurement of antibody to hepatitis B core antigen.

    OpenAIRE

    Angarano, G.; Monno, L; Santantonio, T A; Pastore, G.

    1984-01-01

    A new test principle for the simultaneous detection of total approximate titers and immunoglobulin M antibodies has been developed and applied to the detection of antibody to hepatitis B core antigen. The method is based on the combination of a competition radioimmunoassay, for the determination of total antibody titer, with an indirect enzyme-linked immunosorbent assay for the determination of single class antibodies. The interference of the rheumatoid factor was avoided by including heat-ag...

  1. Neutralizing Antibodies after Infection with Dengue 1 Virus

    Science.gov (United States)

    Alvarez, Mayling; Rodriguez-Roche, Rosmari; Bernardo, Lídice; Montes, Tibaire; Vazquez, Susana; Morier, Luis; Alvarez, Angel; Gould, Ernest A; Halstead, Scott B

    2007-01-01

    Severity of disease is markedly increased when infection with dengue virus type 2 (DENV-2) follows infection with DENV-1. Studies have shown that heterologous neutralizing antibody titers are inversely correlated with severity of a second infection. If this mechanism controlled disease severity in Cuba, heterotypic antibody titers should have declined over time. To determine whether phenotypic changes in dengue antibodies occur over time, we analyzed serum samples collected 4–8 and 20–22 years after DENV-1 infection. We found a significant increase in mean titer of homologous DENV-1 neutralizing antibodies and a significant decrease in heterologous antibodies to 1 of 2 genotypes of DENV-2 virus (the American genotype). Asian DENV-2 viruses were not neutralized during either interval; however, the American genotype underwent phenotypic changes in heterotypic viral neutralizing antibodies in the predicted direction. This finding may be related to the time-dependent changes in severity of disease found with secondary dengue infection. PMID:17479892

  2. Obtainment of polyclonal antibodies to clenbuterol with the use of colloidal gold.

    Science.gov (United States)

    Vasilenko, O A; Staroverov, S A; Yermilov, D N; Pristensky, D V; Shchyogolev, S Yu; Dykman, L A

    2007-01-01

    The effectiveness of an in vivo synthesis of antibodies to clenbuterol with the use of gold nanoparticles as a carrier was evaluated. For comparison, conjugates of clenbuterol with bovine serum albumin were used in immunization. The serum titer was determined by an ELISA. The antibodies were tested by an immunodot assay with immunogold markers. With both techniques we obtained specific and relatively high-titer antibodies to clenbuterol. It was found that the antibodies obtained with the use of gold nanoparticles were not inferior in titer to those obtained to the conjugates of clenbuterol with the protein but surpassed them in specificity.

  3. Vaccine-associated Leptospira antibodies in client-owned dogs.

    Science.gov (United States)

    Martin, L E R; Wiggans, K T; Wennogle, S A; Curtis, K; Chandrashekar, R; Lappin, M R

    2014-01-01

    Long-term microscopic agglutination test (MAT) results after vaccination with 4-serovar Leptospira vaccines are not available for all vaccines used in client-owned dogs. To determine antibody responses of client-owned dogs given 1 of 4 commercially available Leptospira vaccines. Healthy client-owned dogs (n = 32) with no history of Leptospira vaccination for at least the previous year. Dogs were given 1 of 4 Leptospira vaccines on week 0 and then approximately on week 3 and week 52. Sera were collected before vaccine administration on week 0 and then within 3 days of week 3, within 2 days of week 4, and approximately on weeks 7, 15, 29, 52, and 56. Antibody titers against Leptospira serovars bratislava, canicola, grippotyphosa, hardjo, icterohemorrhagiae, and pomona and were determined by MAT. When compared among vaccines, MAT results varied in maximal titers, the serovars inducing maximal titers, and the time required to reach maximal titers. Each vaccine induced at least some MAT titers ≥1 : 800. Most dogs were negative for antibodies against all serovars 1 year after vaccination, and anamnestic responses were variable. Dogs vaccinated with Leptospira vaccines have variable MAT titers over time, and antibodies should not be used to predict resistance to Leptospira infection. MAT titers ≥1 : 800 can develop after Leptospira spp. vaccination, which can complicate the clinical diagnosis of leptospirosis. Copyright © 2014 by the American College of Veterinary Internal Medicine.

  4. Correlation between alanine aminotransferase level, HCV-RNA titer ...

    African Journals Online (AJOL)

    Reham Al Swaff

    2012-04-04

    Apr 4, 2012 ... Abstract The relationship of serum alanine aminotransferase (ALT) level and viral replication to liver damage in chronic hepatitis C virus (HCV) patients remains unclear. The aim of the present study was to determine whether the stage of fibrosis correlates with HCV-. RNA titer and/or serum ALT level in ...

  5. The association between serological titers in infectious bovine rhinotracheitis virus, bovine virus diarrhea virus, parainfluenza-3 virus, respiratory syncytial virus and treatment for respiratory disease in Ontario feedlot calves.

    OpenAIRE

    Martin, S W; Bohac, J G

    1986-01-01

    A seroepidemiological study of the association between antibody titers to infectious bovine rhinotracheitis, parainfluenza-3, bovine virus diarrhea and bovine respiratory syncytial viruses, and treatment for bovine respiratory disease was conducted. A total of 322 calves from five different groups were bled on arrival, then one month later all cases (cattle treated for bovine respiratory disease) were rebled together with an equal number of controls (cattle not treated for any disease). Titer...

  6. Antibodies to sulfatide in leprosy and leprosy reactions

    NARCIS (Netherlands)

    Spierings, E.; de Vlieger, M.; Brand, A.; Klatser, P. R.; Ottenhoff, T. H.

    1999-01-01

    Antibodies to sulfatide have been reported in various demyelinating peripheral polyneuropathies. We have investigated the diagnostic value of these antibodies in leprosy. Anti-sulfatide IgM in leprosy patients was not significantly elevated. High anti-sulfatide IgG titers were observed in

  7. Urine antibody against human cancer antigen NY-ESO-1

    OpenAIRE

    Jäger, Dirk; Stockert, Elisabeth; Karbach, Julia; Herrlinger, Kristina; Atmaca, Akin; Arand, Michael; Chen, Yao-Tseng; Gnjatic, Sacha; Old, Lloyd J; Knuth, Alexander; Jäger, Elke

    2002-01-01

    NY-ESO-1 is one of the most immunogenic tumor antigens known to date. Spontaneous humoral and cellular immune responses against NY-ESO-1 are detected in a substantial proportion of patients with NY-ESO-1 positive cancers. NY-ESO-1 serum antibody is dependent on the presence of NY-ESO-1+ cancer cells, and antibody titers correlate with the clinical development of the disease. NY-ESO-1 serum antibody is associated with detectable NY-ESO-1-specific CD8+ T cell reactivity. High titers of NY-ESO-1...

  8. Improved method to raise polyclonal antibody using enhanced green fluorescent protein transgenic mice.

    Science.gov (United States)

    Ren, Jianke; Wang, Long; Liu, Guoxiang; Zhang, Wen; Sheng, Zhejin; Wang, Zhugang; Fei, Jian

    2008-02-01

    Recombinant fusion protein is widely used as an antigen to raise antibodies against the epitope of a target protein. However, the concomitant anticarrier antibody in resulting antiserum reduces the production of the desired antibody and brings about unwanted non-specific immune reactions. It is proposed that the carrier protein transgenic animal could be used to solve this problem. To validate this hypothesis, enhanced green fluorescent protein (EGFP) transgenic mice were produced. By immunizing the mice with fusion protein His6HAtag-EGFP, we showed that the antiserum from the transgenic mice had higher titer antibody against His6HA tag and lower titer antibody against EGFP compared with that from wild-type mice. Therefore, this report describes an improved method to raise high titer antipeptide polyclonal antibody using EGFP transgenic mice that could have application potential in antibody preparation.

  9. Antibody-dependent enhancement of severe dengue disease in humans.

    Science.gov (United States)

    Katzelnick, Leah C; Gresh, Lionel; Halloran, M Elizabeth; Mercado, Juan Carlos; Kuan, Guillermina; Gordon, Aubree; Balmaseda, Angel; Harris, Eva

    2017-11-17

    For dengue viruses 1 to 4 (DENV1-4), a specific range of antibody titer has been shown to enhance viral replication in vitro and severe disease in animal models. Although suspected, such antibody-dependent enhancement of severe disease has not been shown to occur in humans. Using multiple statistical approaches to study a long-term pediatric cohort in Nicaragua, we show that risk of severe dengue disease is highest within a narrow range of preexisting anti-DENV antibody titers. By contrast, we observe protection from all symptomatic dengue disease at high antibody titers. Thus, immune correlates of severe dengue must be evaluated separately from correlates of protection against symptomatic disease. These results have implications for studies of dengue pathogenesis and for vaccine development, because enhancement, not just lack of protection, is of concern. Copyright © 2017, American Association for the Advancement of Science.

  10. Study on Anti-Hepatitis B Surface Antibody Titer and Specific Interferon Gamma Response Among Dentists

    OpenAIRE

    Manoochehr Makvandi; Mojtaba Rasti; Mohammad Hosein Sarmast; Mehrdad Sadeghi Haj; Nasrin Rastegarvand; Dawood Khalafkhani; Rahil Nahid Samiei; Abdulnabi Shabani; Mohammad Karimi Babaahmadi; Shahram Jalilian; Kambiz Ahmadi Angali; Toran Shahani; Mehran Varnasari

    2017-01-01

    Background Hepatitis B virus (HBV) is a major problem for healthcare workers worldwide, and among them, dentists are at risk of acquiring HBV infection. The prevalence of HBV infection has been reported among the dentists in different regions of the world. Since none of the available drugs can clear HBV infection, the presence of effective immunity against HBV infection is important to prevent HBV infection. Objectives This study ...

  11. Production and titering of recombinant adeno-associated viral vectors.

    Science.gov (United States)

    McClure, Christina; Cole, Katy L H; Wulff, Peer; Klugmann, Matthias; Murray, Andrew J

    2011-11-27

    In recent years recombinant adeno-associated viral vectors (AAV) have become increasingly valuable for in vivo studies in animals, and are also currently being tested in human clinical trials. Wild-type AAV is a non-pathogenic member of the parvoviridae family and inherently replication-deficient. The broad transduction profile, low immune response as well as the strong and persistent transgene expression achieved with these vectors has made them a popular and versatile tool for in vitro and in vivo gene delivery. rAAVs can be easily and cheaply produced in the laboratory and, based on their favourable safety profile, are generally given a low safety classification. Here, we describe a method for the production and titering of chimeric rAAVs containing the capsid proteins of both AAV1 and AAV2. The use of these so-called chimeric vectors combines the benefits of both parental serotypes such as high titres stocks (AAV1) and purification by affinity chromatography (AAV2). These AAV serotypes are the best studied of all AAV serotypes, and individually have a broad infectivity pattern. The chimeric vectors described here should have the infectious properties of AAV1 and AAV2 and can thus be expected to infect a large range of tissues, including neurons, skeletal muscle, pancreas, kidney among others. The method described here uses heparin column purification, a method believed to give a higher viral titer and cleaner viral preparation than other purification methods, such as centrifugation through a caesium chloride gradient. Additionally, we describe how these vectors can be quickly and easily titered to give accurate reading of the number of infectious particles produced.

  12. Passive transfer of maternal antibodies to West Nile virus in flamingo chicks (Phoenicopterus chilensis and Phoenicopterus ruber ruber).

    Science.gov (United States)

    Baitchman, Eric J; Tlusty, Michael F; Murphy, Hayley W

    2007-06-01

    Passive transfer of maternal antibodies against West Nile virus (WNV) was studied in a captive population of Chilean (Phoenicopterus chilensis) and Caribbean flamingos (Phoenicopterus ruber ruber). Transfer of WNV antibodies from hens to chicks was documented and measured by plaque-reduction neutralization test. Hen titers were significantly correlated to chick titers. Mean half-life of maternal WNV antibodies was 13.4 days in chicks for which half-life was measurable.

  13. Physical activity and natural anti-VIP antibodies: potential role in breast and prostate cancer therapy

    National Research Council Canada - National Science Library

    Veljkovic, Milena; Dopsaj, Violeta; Dopsaj, Milivoj; Branch, Donald R; Veljkovic, Nevena; Sakarellos-Daitsiotis, Maria M; Veljkovic, Veljko; Glisic, Sanja; Colombatti, Alfonso

    2011-01-01

    .... We found that sera from individuals having breast and prostate cancers have decreased titers of VIP natural antibodies as demonstrated by a lower reactivity against peptide NTM1, having similar...

  14. Antimitochondrial antibody

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/003529.htm Antimitochondrial antibody To use the sharing features on this page, please enable JavaScript. Antimitochondrial antibodies (AMA) are substances ( antibodies ) that form against mitochondria. ...

  15. [Alpha and beta natural agglutinin titers in neoplasms].

    Science.gov (United States)

    Gota, F

    1979-01-01

    A serological analysis of alpha and beta agglutinin titres has been carried out in cancer patients. Statistics of the patients' blood groups were also taken. The study showed an increased agglutinin titre, the expression of the functioning of the organism's defensive powers. Only in the terminal stage of the neoplastic disease were antibody titres low, the sign of low antibody reactivity of the affected organism.

  16. Using titer and titer normalized to confluence are complementary strategies for obtaining Chinese hamster ovary cell lines with high volumetric productivity of etanercept

    DEFF Research Database (Denmark)

    Pristovšek, Nuša; Hansen, Henning Gram; Sergeeva, Daria

    2018-01-01

    The selection of clonally-derived Chinese hamster ovary (CHO) cell lines with the highest production rate of recombinant glycoproteins remains a big challenge during early stages of cell line development. Different strategies using either product titer or product titer normalized to cell number...

  17. Presence of organ‑specific antibodies in patients with systemic sclerosis.

    Science.gov (United States)

    Wielosz, Ewa; Majdan, Maria; Koszarny, Arkadiusz; Dryglewska, Magdalena; Tabarkiewicz, Jacek

    2016-10-05

    INTRODUCTION According to the literature, organ‑specific antibodies may be present in the course of systemic sclerosis (SSc). OBJECTIVES The aim of this study was to assess the prevalence of antithyroid antibodies (antithyroid peroxidase antibodies [anti‑TPO] and antithyroglobulin antibodies) and of antimitochondrial antibodies (AMAs), as well as to evaluate their clinical significance in patients with SSc. PATIENTS AND METHODS The study involved 86 consecutive in‑hospital patients with SSc (32 patients with diffuse cutaneous SSc [dcSSc] and 54 with limited cutaneous SSc [lcSSc]). Patients were observed for autoimmune thyroid diseases (ATDs) and primary biliary cirrhosis (PBC). Serum samples were obtained from each patient. RESULTS Positive antithyroid antibody titers were observed in 27 patients (31%) and positive AMA titers-in 11 patients (13%). ATD was diagnosed in 26 patients (30%) and PBC-in 10 patients (12%) with SSc. No significant differences in the prevalence of antithyroid antibodies were found between patients with dcSSc and those with lcSSc, but the prevalence of AMAs was significantly higher in patients with lcSSc compared with those with dcSSc. The prevalence of anti‑Ro‑52 antibodies was significantly higher in the SSc group with positive anti‑TPO antibody titers compared with the SSc group with negative anti‑TPO antibody titers. The prevalence of anticentromere antibodies (ACAs) was significantly higher in the SSc group with positive AMA titers compared with the SSc group with negative AMA titers. CONCLUSIONS The prevalence of organ‑specific antibodies in SSc patients is relatively high. The prevalence of AMAs is higher in patients with lcSSc than in those with dcSSc and is strongly associated with the presence of ACAs. Patients with SSc should be evaluated for coexisting ATDs and PBC.

  18. Respons Antibodi Sekunder Terhadap Penyakit Tetelo pada Ayam Petelur Pascavaksinasi Ulangan dengan Vaksin Tetelo Aktif (NEWCASTLE DISEASESECONDARY ANTIBODY RESPONSE AFTER REVACCINATION IN LAYER WITH THE ACTIVE ND VACCINE

    Directory of Open Access Journals (Sweden)

    Andika Budi Kurnianto

    2016-11-01

    Full Text Available Revaccination is required in order to preventNewcastle Disease (ND reccurence inlayers chickens. Oneof vaccine for ND revaccination is freeze-died ND active vaccine containing e” 106,5EID50. Revaccinationisdone to trigger a faster secondary antibody responses in layers and can achieve protective antibody titersagainst ND that can be monitored by a hemagglutinationinhibition (HI. The aim of this study was todetermine the ND secondary antibody responses in layers after revaccination with ND active vaccine.Antibody titer of 20 layers chickens of 20 week old were determined before revaccinations (week 0 andafter revaccinations (week 1 until week 9. The first vaccination was conducted using ND-IB (NewcastleDisease-Infectious Bronchitis at the age of 2 days through eye drops and subcutaneous injection at the ageof 5 days using a dose of 1 ampoule.Vaccination is repeated at the age of 20 weeks at a dose of 1 ½ ampoule through drinking water. Blood samples were collected on the wing vein (venous cutane ulnar and left for 5-10 minutes at room temperature.Sera were then collected and stored at -20oC until use. HI antibody titerwas determined by micro titeration system. The HI mean titers were analyzed by Duncan test. The studyresults showed that antibody titer before revaccination was3,47 HI log 2 and the HI titers after revaccinationwere 4,02; 5,22; 6,52; 7,85; 8,4; 8,6; 7,7; 5,92; dan 3,87 HI log 2 respectivelly at weeks 1, 2, 3, 4, 5, 6, 7, 8, and9.The NDV revaccination with ND active vaccine significantly (P <0.01 increased in antibody titer inlayers starting from week 1 to week 6, but decreased following week 7 to week-9. It can be concluded thatrevaccinantion with ND active vaccine increases the antibody titers in layer chickens.

  19. Distribution of anti-Toxoplasma gondii antibodies among Orang Asli (aborigines) in Peninsular Malaysia.

    Science.gov (United States)

    Hakim, S L; Radzan, T; Nazma, M

    1994-09-01

    The distribution of anti-toxoplasma antibodies among the aborigines in Malaysia and its association with other soil transmitted infections and eosinophilia were studied. A total of 415 serum samples were collected and tested by IFA test. Overall prevalence was 10.6%, lower than previously reported. The antibody titers showed a unimodal distribution peaking at 1:8 dilution. There was a higher proportion of high antibody titer (> 1:128) in the adult compared to the children with no significant difference in prevalence rate by sex. The pattern of infection does not differ from other soil transmitted infections and there was no association between raised Toxoplasma antibodies with eosinophilia.

  20. Determination of low tetanus or diphtheria antitoxin titers in sera by a toxin neutralization assay and a modified toxin-binding inhibition test

    Directory of Open Access Journals (Sweden)

    M.H. Sonobe

    2007-01-01

    Full Text Available A method for the screening of tetanus and diphtheria antibodies in serum using anatoxin (inactivated toxin instead of toxin was developed as an alternative to the in vivo toxin neutralization assay based on the toxin-binding inhibition test (TOBI test. In this study, the serum titers (values between 1.0 and 19.5 IU measured by a modified TOBI test (Modi-TOBI test and toxin neutralization assays were correlated (P < 0.0001. Titers of tetanus or diphtheria antibodies were evaluated in serum samples from guinea pigs immunized with tetanus toxoid, diphtheria-tetanus or triple vaccine. For the Modi-TOBI test, after blocking the microtiter plates, standard tetanus or diphtheria antitoxin and different concentrations of guinea pig sera were incubated with the respective anatoxin. Twelve hours later, these samples were transferred to a plate previously coated with tetanus or diphtheria antitoxin to bind the remaining anatoxin. The anatoxin was then detected using a peroxidase-labeled tetanus or diphtheria antitoxin. Serum titers were calculated using a linear regression plot of the results for the corresponding standard antitoxin. For the toxin neutralization assay, L+/10/50 doses of either toxin combined with different concentrations of serum samples were inoculated into mice for anti-tetanus detection, or in guinea pigs for anti-diphtheria detection. Both assays were suitable for determining wide ranges of antitoxin levels. The linear regression plots showed high correlation coefficients for tetanus (r² = 0.95, P < 0.0001 and for diphtheria (r² = 0.93, P < 0.0001 between the in vitro and the in vivo assays. The standardized method is appropriate for evaluating titers of neutralizing antibodies, thus permitting the in vitro control of serum antitoxin levels.

  1. Minimal variation in anti-A and -B titers among healthy volunteers over time

    DEFF Research Database (Denmark)

    Sprogøe, Ulrik; Yazer, Mark; Rasmussen, Mads Hvidkjær

    2017-01-01

    measurements on the same donor are required to ensure that each donation produces a low titer product. METHODS: The anti-A and/or -B titers were measured on 56 healthy adult volunteers (47 blood donors; 9 blood center personnel) every three months for 12 consecutive months using an automated solid phase...... titer measurements from all 56 volunteers were combined as appropriate, the highest overall combined SD was 0.47 titer steps for IgG anti-A. This value corresponds to a 95% confidence interval for intra-individual variation in this antibody’s titer over 12 months of 0.96 titer steps. Thus, based on one...... measurement, an IgG anti-A with a titer step of, for example, 6 would be expected to be in the range of titer step 5 to titer step 7 over the course of one year with 95% probability. CONCLUSION: The titers of anti-A and/or -B among healthy adults are stable over at least one year. This suggests that repeated...

  2. Serum Titers of Acute Phase Proteins and Immunoglobulin Classes ...

    African Journals Online (AJOL)

    ... duration of smoking, nicotine inhaled, and tar inhaled with any of the humoral factors. Conclusion: This study detected abnormalities in certain aspects of humoral immune responses in Nigerian smokers and this could lead to development of auto-antibodies and cardiovascular diseases in long time cigarette smokers.

  3. Generation of high-titer RCAS virus from DF1 chicken fibroblasts.

    Science.gov (United States)

    Ahronian, Leanne G; Lewis, Brian C

    2014-11-03

    RCAS viruses are replication-competent in avian cells, but are replication-deficient in mammalian cells. Therefore, high-titer RCAS virus stocks can be generated only in avian cells. The chicken fibroblast cell line DF1 is well suited for this purpose. Successful infection of target mammalian cells, particularly in vivo, is dependent on the production of high titer viruses by DF1 cells. Moreover, consistency in viral titer helps to ensure uniformity in results produced following the use of independent lots of virus producer cells. Therefore, it is critical to determine the viral titer before initiating these experiments. Because several factors, including insert size and the effect of the inserted gene product on the viability of DF1 cells, influence viral titer, the production of high virus titers cannot be assumed. For RCASBP-A-based viruses, a titer of >1 × 10(7) IU/mL is considered appropriate. Importantly, the virus reverse transcriptase is error prone; errors will accumulate in the virus produced over time. Therefore, virus producer cells should not be cultured for >4-6 wk before being replaced with fresh producer cells. Low passage virus producer cells may be frozen and stored at -80°C; thawed cells will not display a reduction in virus titer. Virus can be collected regularly, concentrated, and stored at -80°C for long-term use; thawed viral stocks typically show a 10-fold decrease in titer. © 2014 Cold Spring Harbor Laboratory Press.

  4. Randomized Trials Comparing Inactivated Vaccine after Medium- or High-titer Measles Vaccine with Standard Titer Measles Vaccine after Inactivated Vaccine

    DEFF Research Database (Denmark)

    Aaby, Peter; Ravn, Henrik; Benn, Christine S.

    2016-01-01

    Background: Observational studies have suggested that girls have higher mortality if their most recent immunization is an inactivated vaccine rather than a live vaccine. We therefore reanalyzed 5 randomized trials of early measles vaccine (MV) in which it was possible to compare an inactivated...... vaccines [after medium-titer MV (MTMV) or high-titer MV (HTMV)] and a live standard titer MV (after an initial inactivated vaccine). Methods: The trials were conducted in Sudan, Senegal, The Gambia and Guinea-Bissau. The intervention group received live MTMV or HTMV from 4 to 5 months...... and then an inactivated vaccine from 9 to 10 months of age; the control children received inactivated vaccine/placebo from 4 to 5 months and standard titer MV from 9 to 10 months of age. We compared mortality from 9 months until end of study at 3 to 5 years of age for children who received inactivated vaccine (after MTMV...

  5. Physical Activity and Natural Anti-VIP Antibodies: Potential Role in Breast and Prostate Cancer Therapy: e28304

    National Research Council Canada - National Science Library

    Milena Veljkovic; Violeta Dopsaj; Milivoj Dopsaj; Donald R Branch; Nevena Veljkovic; Maria M Sakarellos-Daitsiotis; Veljko Veljkovic; Sanja Glisic; Alfonso Colombatti

    2011-01-01

    .... Methodology and Results We found that sera from individuals having breast and prostate cancers have decreased titers of VIP natural antibodies as demonstrated by a lower reactivity against peptide...

  6. Monoclonal Antibodies.

    Science.gov (United States)

    Killington, R. A.; Powell, K. L.

    1984-01-01

    Monoclonal antibodies have provided an exciting addition to the "armory" of the molecular biologist and immunologist. This article discusses briefly the concept of, techniques available for, production of, and possible uses of monoclonal antibodies. (Author)

  7. Thyroid Antibodies

    Science.gov (United States)

    ... Fungal Infections Gout Graves Disease Guillain-Barré Syndrome Hashimoto Thyroiditis Heart Attack and Acute Coronary Syndrome Heart ... hypothyroidism or hyperthyroidism , such as Graves disease or Hashimoto thyroiditis . Thyroid antibody tests include: Thyroid peroxidase antibody ( ...

  8. Seroprevalence of antibodies against Coccidioides immitis in healthy horses.

    Science.gov (United States)

    Higgins, Jill C; Leith, Gayle S; Voss, Ed D; Pappagianis, Demosthenes

    2005-06-01

    To determine the seroprevalence of antibodies against Coccidioides immitis in healthy horses residing in an area in which the organism is endemic. Prospective study. 197 healthy horses (in which coccidioidomycosis had not been previously diagnosed) that resided in an area of Arizona in which coccidioidomycosis is endemic. Of the horses evaluated at the Arizona Equine Medical and Surgical Center during a 6-month period, 197 with no clinical signs of coccidioidomycosis were randomly selected for inclusion in the study; sera were evaluated for IgM and IgG antibodies against C immitis via an immunodiffusion assay (IgG-positive samples were assessed quantitatively). Within 6 months, recheck titer evaluations were attempted for all seropositive horses. Serum antibodies against C immitis were detected in 8 of 197 horses (seroprevalence, 4.06%). Results of serologic assays were positive for IgG antibodies and negative for IgM antibodies in 7 horses and positive for both IgG and IgM antibodies in 1 horse; reciprocal serum IgG antibody titers were low (none > 8). Follow-up serologic data were obtained from 5 horses; compared with initial findings, horses had become seronegative or titers were unchanged or decreased. Duration of residence in the area was significantly shorter for seropositive horses than for seronegative horses. Serum antibodies against C immitis may rarely be detected in healthy horses residing in an area in which the disease is endemic; any horse with a detectable serum antibody titer should be reevaluated after an interval of at least 3 weeks.

  9. Antistreptolysin O titer in health and disease: levels and significance

    Directory of Open Access Journals (Sweden)

    Alyaa Amal Kotby

    2012-02-01

    Full Text Available Over diagnosis of acute rheumatic fever (ARF based on a raised antistreptolysin O titer (ASOT is not uncommon in endemic areas. In this study, 660 children (aged 9.2 ±1.7 years were recruited consecutively and classified as: G1 (control group, n=200 healthy children, G2 (n=20 with ARF 1st attack, G3 (n=40 with recurrent ARF, G4 (n=100 with rheumatic heart disease (RHD on long acting penicillin (LAP, G5 (n=100 with acute follicular tonsillitis, and G6 (n=200 healthy children with history of repeated follicular tonsillitis more than three times a year. Serum ASOT was measured by latex agglutination. Upper limit of normal (ULN ASOT (80th percentile was 400 IU in G1, 200 IU in G4, and 1600 IU in G6. Significantly high levels were seen in ARF 1st attack when compared to groups 1 and 5 (P<0.001 and P<0.05, respectively. ASOT was significantly high in children over ten years of age, during winter and in those with acute rheumatic carditis. ASOT showed significant direct correlation with the number of attacks of tonsillitis (P<0.05. Egyptian children have high ULN ASOT reaching 400 IU. This has to be taken into consideration when interpreting its values in suspected ARF. A rise in ASOT is less prominent in recurrent ARF compared to 1st attack, and acute and recurrent tonsillitis. Basal levels of ASOT increase with age but the pattern of increase during infection is not age dependent

  10. Occurrence of anti-Neospora caninum and anti-Toxoplasma gondii antibodies in horses in the Pantanal of Mato Grosso, Brazil

    Directory of Open Access Journals (Sweden)

    Luciane Maria Laskoski

    2015-04-01

    Full Text Available This study aimed to evaluate the occurrence of anti-Neospora caninum and anti-Toxoplasma gondii antibodies in horses from Pantanal, in Mato Grosso state. Two hundred blood samples were collected from horses in Pantanal of Mato Grosso, Brazil. The samples were analyzed by IFAT for the detection of anti-Neospora caninum and anti-Toxoplasma gondii antibodies. Antibodies to N. caninum were found in 30 (15% of 200 horses in titers of 50 (25 horses, 100 (two horses, 200 (two horses, and 400 (one horse. Antibodies to T. gondii were found in five (2.5% of 200 horses in titers of 50 (three horses, 200 (one horse, and 400 (one horse. One animal showed antibody titers for both coccidian (titers of 200 for N. caninum e 400 for T. gondii. The pantaneiros horses were exposed to Neospora spp. and T. gondii.

  11. Anticarbohydrate Antibody Repertoires in Patients Transplanted with Fetal Pig Islets Revealed by Glycan Arrays

    DEFF Research Database (Denmark)

    Blixt, Klas Ola; Kumagai-Braesch, A.; Tibell, A.

    2009-01-01

    Ten patients with type I diabetes were transplanted with porcine fetal islet-like cell clusters (ICC) between 1990 and 1993. A significant rise in the anti-a-Gal antibody titers was seen posttransplant, but also non-a-Gal-specific antibodies were detected in some patients. We have reanalyzed...... the carbohydrate specificity of antibodies in the sera from seven of these patients taken before transplantation, 1, 6 and 12 months posttransplantation using a glycan array with 200 structurally defined glycans. The main findings were: (i) prepig ICC transplantation patients had antibodies reactive with terminal...... compounds; (ii) the titers of all carbohydrate-specific antibodies detected before transplantation rose after transplantation; (iii) the kinetics of the antibody responses differed between patients; (iv) in some patients antibodies reacting with Gala1,3Lex and several structures terminated with Neu5Gc...

  12. Characterizing Antibodies.

    Science.gov (United States)

    Weis-Garcia, Frances; Carnahan, Robert H

    2017-11-01

    Perhaps because they are such commonly used tools, many researchers view antibodies one-dimensionally: Antibody Y binds antigen X. Although few techniques require a comprehensive understanding of any particular antibody's characteristics, well-executed experiments do require a basic appreciation of what is known and, equally as important, what is not known about the antibody being used. Ignorance of the relevant antibody characteristics critical for a particular assay can easily lead to loss of precious resources (time, money, and limiting amounts of sample) and, in worst-case scenarios, erroneous conclusions. Here, we describe various antibody characteristics to provide a more well-rounded perspective of these critical reagents. With this information, it will be easier to make informed decisions on how best to choose and use the available antibodies, as well as knowing when it is essential and how to determine a particular as yet-undefined characteristic. © 2017 Cold Spring Harbor Laboratory Press.

  13. Long term impact of high titer Edmonston-Zagreb measles vaccine on T lymphocyte subsets

    DEFF Research Database (Denmark)

    Lisse, I M; Aaby, P; Knudsen, K

    1994-01-01

    conducted in Guinea-Bissau. To test for possible long term impact on the immune system, an investigation of T cell subsets was conducted among all children still residing in the community at 3 to 5 years of age. No differences were found between recipients of medium titer vaccine and controls. In the second......Several trials of high titer measles vaccine (> 10(4.7) plaque-forming unit) have found female recipients of Edmonston-Zagreb (EZ) vaccine to have lower survival than female recipients of standard measles vaccine. Two trials with medium and high titer EZ vaccine from the age of 4 months were...... unlikely to explain the reduced survival which has been associated with high titer EZ measles vaccination. In the 2 years after the investigation of T cell subsets, there was no increased mortality for recipients of EZ vaccine. Hence it is unlikely that high titer vaccine has an persistent adverse effect...

  14. Newcastle disease virus and antibody levels in matched sera ...

    African Journals Online (AJOL)

    Haemagglutination inhibition assay was performed for all sera and egg yolk samples. Protective serum antibody titres of ≥3 (log2) were recorded in 5.3% of the naturally exposed, indigenous village hens. Antibody titers to Newcastle disease virus in the yolks were higher than in their sera (230.08 ± 40.05; 1.56 ± 0.74 for ...

  15. Early detection of neutralizing antibodies to interferon-beta in multiple sclerosis patients

    DEFF Research Database (Denmark)

    Hegen, H; Millonig, A; Bertolotto, A

    2014-01-01

    BACKGROUND: Neutralizing antibodies (NAb) affect efficacy of interferon-beta (IFN-b) treatment in multiple sclerosis (MS) patients. NAbs evolve in up to 44% of treated patients, usually between 6-18 months on therapy. OBJECTIVES: To investigate whether early binding antibody (BAb) titers...

  16. Neutralizing antibodies in slowly progressing HIV-1 infection

    DEFF Research Database (Denmark)

    Schønning, Kristian; Nielsen, C; Iversen, Johan

    1995-01-01

    with SPI generally neutralized the contemporaneous isolate, whereas serum from individuals with RPI did not [geometric mean antibody titer (GMT), 45 vs. 3; p = 0.0047]. There was no difference in neutralizing ability against HIVMN (GMT,2,593 vs. 2,263; p = 0.74) and only a small difference against HIVIIIB...

  17. Coronary angioplasty induces rise in Chlamydia pneumoniae-specific antibodies

    NARCIS (Netherlands)

    Tiran, A; Tio, RA; Ossewaarde, JM; Tiran, B; Den Heijer, P; The, TH; Wilders-Truschnig, MM

    Chlamydia pneumoniae is frequently found in atherosclerotic lesions, and high titers of specific antibodies are associated with increased risk for acute myocardial infarction, However, a causative relation has not been established yet. We performed a prospective study of 93 patients undergoing

  18. Prevalence of Newcastle disease virus antibodies in sera and eggs ...

    African Journals Online (AJOL)

    The seroprevalence and maternal antibody profiles to Newcastle disease virus infection of guinea fowls were studied using haemagglutination inhibition (HI) ... In addition, birds with titers ≤ 35.4 are partially immune and may shed the virus without a clinical disease when infected thereby becoming a risk to in-contact birds.

  19. Effect of increased CRM₁₉₇ carrier protein dose on meningococcal C bactericidal antibody response.

    Science.gov (United States)

    Lee, Lucia H; Blake, Milan S

    2012-04-01

    New multivalent CRM(197)-based conjugate vaccines are available for childhood immunization. Clinical studies were reviewed to assess meningococcal group C (MenC) antibody responses following MenC-CRM(197) coadministration with CRM(197)-based pneumococcal or Haemophilus influenzae type b conjugate vaccines. Infants receiving a total CRM(197) carrier protein dose of ∼50 μg and concomitant diphtheria-tetanus-acellular pertussis (DTaP)-containing vaccine tended to have lower MenC geometric mean antibody titers and continued to have low titers after the toddler dose. Nevertheless, at least 95% of children in the reported studies achieved a MenC serum bactericidal antibody (SBA) titer of ≥ 1:8 after the last infant or toddler dose. SBA was measured using an assay with a baby rabbit or human complement source. Additional studies are needed to assess long-term antibody persistence and MenC CRM(197) conjugate vaccine immunogenicity using alternative dosing schedules.

  20. Poor Correlation between Pneumococcal IgG and IgM Titers and Opsonophagocytic Activity in Vaccinated Patients with Multiple Myeloma and Waldenstrom's Macroglobulinemia.

    Science.gov (United States)

    Karlsson, Johanna; Roalfe, Lucy; Hogevik, Harriet; Zancolli, Marta; Andréasson, Björn; Goldblatt, David; Wennerås, Christine

    2016-04-01

    Patients with multiple myeloma and other B cell disorders respond poorly to pneumococcal vaccination. Vaccine responsiveness is commonly determined by measuring pneumococcal serotype-specific antibodies by enzyme-linked immunosorbent assay (ELISA), by a functional opsonophagocytosis assay (OPA), or by both assays. We compared the two methods in vaccinated elderly patients with multiple myeloma, Waldenstrom's macroglobulinemia, and monoclonal gammopathy of undetermined significance (MGUS). Postvaccination sera from 45 patients (n= 15 from each patient group) and 15 control subjects were analyzed by multiplexed OPA for pneumococcal serotypes 4, 6B, 14, and 23F, and the results were compared to IgG and IgM antibody titers measured by ELISA. While there were significant correlations between pneumococcal OPA and IgG titers for all serotypes among the control subjects (correlation coefficients [r] between 0.51 and 0.85), no significant correlations were seen for any of the investigated serotypes in the myeloma group (r= -0.18 to 0.21) or in the group with Waldenstrom's macroglobulinemia (borderline significant correlations for 2 of 4 serotypes). The MGUS group resembled the control group by having good agreement between the two test methods for 3 of 4 serotypes (r= 0.53 to 0.80). Pneumococcal postvaccination IgM titers were very low in the myeloma patients compared to the other groups and did not correlate with the OPA results. To summarize, our data indicate that ELISA measurements may overestimate antipneumococcal immunity in elderly subjects with B cell malignancies and that a functional antibody test should be used specifically for myeloma and Waldenstrom's macroglobulinemia patients. Copyright © 2016, American Society for Microbiology. All Rights Reserved.

  1. Intracellular response to process optimization and impact on productivity and product aggregates for a high-titer CHO cell process.

    Science.gov (United States)

    Handlogten, Michael W; Lee-O'Brien, Allison; Roy, Gargi; Levitskaya, Sophia V; Venkat, Raghavan; Singh, Shailendra; Ahuja, Sanjeev

    2018-01-01

    A key goal in process development for antibodies is to increase productivity while maintaining or improving product quality. During process development of an antibody, titers were increased from 4 to 10 g/L while simultaneously decreasing aggregates. Process development involved optimization of media and feed formulations, feed strategy, and process parameters including pH and temperature. To better understand how CHO cells respond to process changes, the changes were implemented in a stepwise manner. The first change was an optimization of the feed formulation, the second was an optimization of the medium, and the third was an optimization of process parameters. Multiple process outputs were evaluated including cell growth, osmolality, lactate production, ammonium concentration, antibody production, and aggregate levels. Additionally, detailed assessment of oxygen uptake, nutrient and amino acid consumption, extracellular and intracellular redox environment, oxidative stress, activation of the unfolded protein response (UPR) pathway, protein disulfide isomerase (PDI) expression, and heavy and light chain mRNA expression provided an in-depth understanding of the cellular response to process changes. The results demonstrate that mRNA expression and UPR activation were unaffected by process changes, and that increased PDI expression and optimized nutrient supplementation are required for higher productivity processes. Furthermore, our findings demonstrate the role of extra- and intracellular redox environment on productivity and antibody aggregation. Processes using the optimized medium, with increased concentrations of redox modifying agents, had the highest overall specific productivity, reduced aggregate levels, and helped cells better withstand the high levels of oxidative stress associated with increased productivity. Specific productivities of different processes positively correlated to average intracellular values of total glutathione. Additionally

  2. THE PASSAGE AND DURATION OF ANTIBODIES TO WEST NILE VIRUS IN HUMBOLDT PENGUINS (SPHENISCUS HUMBOLDTI).

    Science.gov (United States)

    Cushing, Andrew C; Dubovi, Edward; Erb, Hollis N; Georoff, Timothy A; Abou-Madi, Noha

    2017-03-01

    West Nile virus (genus Flavivirus) outbreaks and mortality events have been documented in both wild and captive avian species, including penguins. Serologic response to vaccination in avian species has varied and appears to be largely species dependent; however, Humboldt penguins ( Spheniscus humboldti ) previously showed excellent rates of seroconversion. The goal of this study was to determine virus neutralization titers of 17 Humboldt penguin hens and their subsequent eggs, chicks, or both following vaccination with a killed West Nile vaccine. Chicks were also vaccinated at 56, 70, and 84 days old. Titers were measured from 10-346 days prior to lay as well as serially in seven chicks. Data collected showed positive rank correlation between maternal titers and yolk titers (ρ = 0.90, P penguin chicks based on a time-dependent decline in maternal antibody titers. Cell-mediated immunity and experimental challenge following vaccination have not yet been investigated in this species.

  3. Hatchery workers' IgG antibody profiles to airborne bacteria.

    Science.gov (United States)

    Brauner, Paul; Gromöller, Silvana; Pfeifer, Yvonne; Wilharm, Gottfried; Jäckel, Udo

    2017-04-01

    Occupational exposure to high concentrations of airborne bacteria in poultry production is related to an increased risk of respiratory disorders. However, etiology and in particular microorganisms' potential role in pathogenesis still needs to be elucidated. Thus, detection of specific antibodies against occupational microbial antigens may lead to identification of potentially harmful species. For the purpose of IgG titer determination, indirect immunofluorescence on various bacterial isolates from duck hatchery air was combined with image-based quantification of fluorescence intensity. Moreover, in addition to established assays with pure bacterial cultures, a new approach utilized complex bioaerosol samples for detection of anti-microbial antibodies in human sera by determination of percentages of antibody-bound cells in different serum dilutions. Mean titers in sera from hatchery workers and a non-exposed control group did not display significant differences for most tested isolates and application of comprehensive cluster analysis to entire titer data revealed no structure reflecting workers and controls group. Furthermore, determination of immunoreactivity to the complete microbial community in workplace air displayed similar proportions of antibody-bound cells in both groups. Although no general differences in immunoreaction patterns were observed, mean titers to a Proteus mirabilis isolate and to 3 of 4 distinct Acinetobacter baumannii isolates were higher in the group of hatchery workers than in the reference group indicating a potential applicability as exposure markers. We conclude, despite long term bioaerosol exposure, hatchery workers' IgG antibody profiles to tested antigens did not differ substantially from those of the control group. However, increased workers' titers to A. baumannii and clinical relevance of this species should lead to further investigations regarding potential involvement in pathogenesis of occupational respiratory disorders

  4. Anti-Borna disease virus antibody responses in psychiatric patients: long-term follow up.

    Science.gov (United States)

    Heinrich, Alexander; Adamaszek, Michael

    2010-06-01

    Data suggesting a pathogenetic role for Borna disease virus (BDV) in neuropsychiatric diseases are still inconclusive and it is unknown whether humans become persistently infected or clear the virus infection. The aim of the present study was therefore to investigate long-term BDV-specific antibody responses in psychiatric patients in order to gain new insights into human BDV infection and its pathogenicity. BDV-specific antibody titers and associations with clinical conditions were studied retrospectively in 94 seropositive patients with schizophrenia (n = 46), affective disorders (n = 19) and other psychiatric disorders (n = 29) who had been repeatedly tested for the presence of BDV-specific antibodies on indirect immunofluorescence assay between 1985 and 2006. Long-term titer dynamics were studied in 46 patients followed up for a period of >36 months. A total of 25 of these 46 patients (54.3%) had persistent seropositivity, whereas seroreversion from positive to negative was observed in 21 (45.7%). Patients in the early course of schizophrenia had lower antibody titers compared to patients in the advanced course (P = 0.017), while a higher proportion of patients in the early course had titer increases (P < 0.05). There were no significant differences in antibody titers between patient subgroups with clinically stable and acute psychiatric disorders. Persistent seropositivity in a subgroup of psychiatric patients in the long-term analysis suggests chronic BDV infection in humans.

  5. Antibody response to equine coronavirus in horses inoculated with a bovine coronavirus vaccine.

    Science.gov (United States)

    Nemoto, Manabu; Kanno, Toru; Bannai, Hiroshi; Tsujimura, Koji; Yamanaka, Takashi; Kokado, Hiroshi

    2017-11-17

    A vaccine for equine coronavirus (ECoV) is so far unavailable. Bovine coronavirus (BCoV) is antigenically related to ECoV; it is therefore possible that BCoV vaccine will induce antibodies against ECoV in horses. This study investigated antibody response to ECoV in horses inoculated with BCoV vaccine. Virus neutralization tests showed that antibody titers against ECoV increased in all six horses tested at 14 days post inoculation, although the antibody titers were lower against ECoV than against BCoV. This study showed that BCoV vaccine provides horses with antibodies against ECoV to some extent. It is unclear whether antibodies provided by BCoV vaccine are effective against ECoV, and therefore ECoV challenge studies are needed to evaluate efficacy of the vaccine in the future.

  6. [Evolution of beta-hCG titers after systemic treatment of unruptured ectopic pregnancy].

    Science.gov (United States)

    Elito Júnior, J; Uchiyama, M; Camano, L

    1998-01-01

    The follow-up of this treatment is done by monitorization of beta-hCG titers. The objective of this study is to evaluate the beta-hCG titers after treatment with MTX. Twenty four women were included in the study. The inclusion criteria were: ectopic pregnancy or = 15% in 85.7% of the cases, and decline < 15% in 14.3%. There was the necessity of a second dose of MTX in only two cases (8.4%), since the levels of beta-hCG declined less than 15%, in this period. The titers of beta-hCG increase in 50.0% of the cases, so it is a frequent event. The understanding of this evolution of beta-hCG titers avoids surgery in the first week of the treatment.

  7. Correlation between ovarian growth, vitellogenin titer, and yolk polypeptide pattern in the haemolymph of Calliphora vicina

    DEFF Research Database (Denmark)

    Sørensen, Ilona Kryspin; Jensen, P. V.

    1982-01-01

    During the first egg maturation cycle ofCalliphora vicina changes in the vitellogenin titer and yolk polypeptide pattern of the haemolymph are correlated with the intensity of follicular growth, and the rate of yolk deposition.......During the first egg maturation cycle ofCalliphora vicina changes in the vitellogenin titer and yolk polypeptide pattern of the haemolymph are correlated with the intensity of follicular growth, and the rate of yolk deposition....

  8. [Analysis of Correlation between IgG Titer of Pregnant Women and Neonatal Hemolytic Complications of Different Blood Groups].

    Science.gov (United States)

    Ye, Hai-Hui; Huang, Hong-Hai; Wang, Xiao-Lin; Pi, You-Jun

    2017-10-01

    To study the relationship between IgG titer of pregnant women and hemolytic disease of newborn(HDN) with different blood groups. Four hundred pregnant women, including pregnant women with type O blood, were selected from May 2014 to January 2015 in our hospital for inspection and a couple of different blood groups, the IgG titer of pregnant women were detected in the inspection process. According to neonatal HDN, newborns were divided into 2 groups: HDN group(85 cases) and non-HDN group(315 cases). The incidence of postpartum neonatal hemolytic disease was tracked and the correlation of IgG titers with HDN were systematically analyzed. In the production and inspection process, the IgG titer in pregnant women was divided into IgG titer >64 and IgG titer IgG titers with ABO hemolytic disease of the newborn, that is, with the increase of IgG titer, the incidence of hemolytic disease of newborns increased in certain degree (r=0.8832), the risk in 4 groups of neonatal HDN was higher than that in IgG titer IgG titer >64 HDN group. There is a certain corelation between prevalence of ABO-HDN and IgG titer of pregnant women. For these pregnant women, the control of the pregnant women IgG titer has a positive clinical significance to reduce the incidence of hemolytic disease of the newborn.

  9. Randomized Trials Comparing Inactivated Vaccine After Medium- or High-titer Measles Vaccine With Standard Titer Measles Vaccine After Inactivated Vaccine: A Meta-analysis.

    Science.gov (United States)

    Aaby, Peter; Ravn, Henrik; Benn, Christine S; Rodrigues, Amabelia; Samb, Badara; Ibrahim, Salah A; Libman, Michael D; Whittle, Hilton C

    2016-11-01

    Observational studies have suggested that girls have higher mortality if their most recent immunization is an inactivated vaccine rather than a live vaccine. We therefore reanalyzed 5 randomized trials of early measles vaccine (MV) in which it was possible to compare an inactivated vaccines [after medium-titer MV (MTMV) or high-titer MV (HTMV)] and a live standard titer MV (after an initial inactivated vaccine). The trials were conducted in Sudan, Senegal, The Gambia and Guinea-Bissau. The intervention group received live MTMV or HTMV from 4 to 5 months and then an inactivated vaccine from 9 to 10 months of age; the control children received inactivated vaccine/placebo from 4 to 5 months and standard titer MV from 9 to 10 months of age. We compared mortality from 9 months until end of study at 3 to 5 years of age for children who received inactivated vaccine (after MTMV or HTMV) and standard titer MV (after inactivated vaccine), respectively. The original datasets were analyzed using a Cox proportional hazards model stratified by trial. The mortality rate ratio (MRR) was 1.38 (95% confidence interval: 1.05-1.83) after an inactivated vaccine (after MTMV or HTMV) compared with a standard titer MV (after inactivated vaccine). Girls had a MRR of 1.89 (1.27-2.80), whereas there was no effect for boys, the sex-differential effect being significant (P = 0.02). Excluding measles cases did not alter these conclusions, the MRR after inactivated vaccines (after MTMV or HTMV) being 1.40 (1.06-1.86) higher overall and 1.92 (1.29-2.86) for girls. Control for variations in national immunization schedules for other vaccines did not modify these results. After 9 months of age, all children had been immunized against measles, and mortality in girls was higher when they had received inactivated vaccines (after MTMV or HTMV) rather than live standard titer MV (after an inactivated vaccine).

  10. The effects of periodontal therapy on serum antibody (IgG) levels to plaque microorganisms.

    Science.gov (United States)

    Aukhil, I; Lopatin, D E; Syed, S A; Morrison, E C; Kowalski, C J

    1988-10-01

    The influence of periodontal therapy on serum antibody titers to selected periodontal disease-associated microorganisms was assessed in 23 patients having chronic inflammatory periodontal disease (CIPD). The immunoglobulin G (IgG) titers were determined by the microELISA technique in serum samples obtained prior to treatment; following a hygienic phase which included scaling, root planing, and oral hygiene instruction; following surgical treatment; and one year and two years following hygienic phase (maintenance phase). Considerable individual variability existed in the magnitude of immune response to specific bacterial preparations. Significant reductions in the mean antibody titers were seen to A. viscosus, S. sanguis, F. nucleatum, S. sputigena, B. gingivalis, B. intermedius, B. melaninogenicus, T. vincentii, and T. denticola by the end of the second year of maintenance. There was no consistent response to Capnocytophaga. When individual patient responses were examined, 6 of the 23 were found to have elevated titers to at least one of the microorganisms in the interval between pretreatment and the end of the hygienic phase; however, in all but one case, the titers at the end of the second year of maintenance were below pretreatment levels. Antibody levels to bacteria such as S. sanguis were modified during therapy. This would indicate that immune responses to microbes not generally considered to be "periodontal pathogens" may be modified by adjuvant activity associated with subgingival plaque or changes in the environment of the sulcus and that subsequent changes in titer do not necessarily reflect a role of that microorganism in the disease process.

  11. Higher titers of anti-Chlamydia pneumoniae IgG in diabetic retinopathy: a cross-sectional study.

    Science.gov (United States)

    Banaee, Touka; Daneshvar Kakhki, Ramin; Abrishami, Mojtaba; Mahmoudi, Mahmoud; Farzadnia, Mehdi

    2015-02-01

    Chronic inflammation has a role in the pathogenesis of diabetic retinopathy. Infection with intracellular organisms may incite chronic inflammation. This study was conducted to investigate the association between previous infection with Chlamydia pneumoniae (an intracellular microorganism) and diabetic retinopathy. Patients with type 2 diabetes mellitus (30-60 years old) and age-matched normal controls were recruited. Patients with history of cardiovascular or cerebrovascular disease, recent pulmonary infection and the presence of age-related macular degeneration were excluded from the study. Complete ophthalmic examinations were performed. Fasting blood sugar and haemoglobin levels were measured in diabetic patients and controls, and HgbA1c , blood urea nitrogen, creatinine and 24-h urine protein were measured in diabetic patients. Anti-C. pneumoniae IgG (enzyme-linked immunosorbent assay) was measured in the sera of all participants. A total of 215 type 2 diabetic patients and 243 normal healthy controls were included. Anti-C. pneumoniae IgG titers were higher in patients affected by diabetic retinopathy than participants without retinopathy (74.78 ± 33.38 vs 66.18 ± 31.40, p = 0.028). Diabetic patients with diabetic retinopathy also had higher titers than diabetic patients without diabetic retinopathy (74.78 ± 33.38 vs 66.11 ± 33.41, p = 0.042). Of different variables including age, body mass index, haemoglobin level, glycated haemoglobin level, fasting blood sugar, mean arterial pressure and blood urea nitrogen, only age (r = 0.17; p = 0.001) and body mass index (r = 0.15; p = 0.003) were correlated with anti-C. pneumoniae IgG levels. In regression analysis, the presence of diabetic retinopathy was still a determinant of the antibody level (p = 0.03). Anti-C. pneumoniae IgG titers were higher in patients with diabetic retinopathy, which may indicate a role of this infection in the pathogenesis of diabetic

  12. Monoclonal Antibodies.

    Science.gov (United States)

    Geskin, Larisa J

    2015-10-01

    Use of monoclonal antibodies (mAbs) has revolutionized cancer therapy. Approaches targeting specific cellular targets on the malignant cells and in tumor microenvironment have been proved to be successful in hematologic malignancies, including cutaneous lymphomas. mAb-based therapy for cutaneous T-cell lymphoma has demonstrated high response rates and a favorable toxicity profile in clinical trials. Several antibodies and antibody-based conjugates are approved for use in clinical practice, and many more are in ongoing and planned clinical trials. In addition, these safe and effective drugs can be used as pillars for sequential therapies in a rational stepwise manner. Copyright © 2015 Elsevier Inc. All rights reserved.

  13. Thyroid Antibodies

    Science.gov (United States)

    ... Factor Antibody Iron Iron Tests JAK2 Mutation Kidney Stone Analysis Kidney Stone Risk Panel KRAS Mutation Lactate Lactate Dehydrogenase (LD) ... gain Fatigue Dry skin Hair loss Intolerance to cold Constipation A high level of thyroid hormone ( hyperthyroidism ) ...

  14. Pathogenesis and mechanisms of antibody-mediated hemolysis.

    Science.gov (United States)

    Flegel, Willy A

    2015-07-01

    The clinical consequences of antibodies to red blood cells (RBCs) have been studied for a century. Most clinically relevant antibodies can be detected by sensitive in vitro assays. Several mechanisms of antibody-mediated hemolysis are well understood. Such hemolysis after transfusion is reliably avoided in a donor-recipient pair, if one individual is negative for the cognate antigen to which the other has the antibody. Mechanisms of antibody-mediated hemolysis were reviewed based on a presentation at the Strategies to Address Hemolytic Complications of Immune Globulin Infusions Workshop addressing intravenous immunoglobulin (IVIG) and ABO antibodies. The presented topics included the rates of intravascular and extravascular hemolysis; immunoglobulin (Ig)M and IgG isoagglutinins; auto- and alloantibodies; antibody specificity; A, B, A,B, and A1 antigens; A1 versus A2 phenotypes; monocytes-macrophages, other immune cells, and complement; monocyte monolayer assay; antibody-dependent cell-mediated cytotoxicity; and transfusion reactions due to ABO and other antibodies. Several clinically relevant questions remained unresolved, and diagnostic tools were lacking to routinely and reliably predict the clinical consequences of RBC antibodies. Most hemolytic transfusion reactions associated with IVIG were due to ABO antibodies. Reducing the titers of such antibodies in IVIG may lower the frequency of this kind of adverse event. The only way to stop these events is to have no anti-A or anti-B in the IVIG products. © 2015 AABB.

  15. Demonstration of carbohydrate-specific immunoglobulin G4 antibodies in sera of patients receiving grass pollen immunotherapy

    NARCIS (Netherlands)

    van Ree, R.; Aalberse, R. C.

    1995-01-01

    From a group of 92 patients receiving grass pollen immunotherapy, and selected on grounds of high IgG4 titers against Lol p I, sera were tested for IgG4 antibodies against the glycosylated grass pollen allergen Lol p XI. In 72 of 92 cases IgG4 antibodies were demonstrated. The N-glycan of Lol p XI

  16. Clinical correlation of antimitochondrial antibodies.

    Science.gov (United States)

    Zuber, M A; Recktenwald, C

    2003-02-21

    Antimitochondrial antibodies (AMA) are a hallmark of primary biliary cirrhosis (PBC). They are believed to be absolutely disease specific. It does occur that patients with positive AMA are diagnosed with PBC in the absence of liver specific signs and symptoms. The aim of the present study was to examine the disease spectrum of unselected AMA positive patients of an university hospital. All of the AMA tests performed in the immunological laboratory of the hospital between 1992 and 1998 were examined for positivity. 100 patients with a positive result were analyzed retrospectively for diagnosis, clinical and laboratory features. 61 patients suffered from liver diseases and 39 from non-liver diseases. The patients with liver diseases were 36 patients with PBC, 2 patients with PBC/PSC-overlap syndrome, 4 patients with autoimmune hepatitis and 19 patients with different liver diseases of other than autoimmune origin. The 39 patients with non-liver diseases included 9 patients with systemic autoimmune diseases, 3 patients with organ-specific autoimmune diseases, 8 patients with carcinoma and 19 patients with different diseases. 97 patients had an ELISA test for antibodies to the mitochondrial antigen M2 performed in addition to the immunofluorescence test for AMA. 73 patients had positive values for anti-M2 antibodies and 24 patients had negative results. Anti-M2 antibody values were divided in negative, low (5-100 U/ml), medium (101-1000 U/ml), high (1001-10000 U/ml) and very high (>10000 U/ml). Very high and high anti-M2 values were present mainly in patients with PBC and some patients with other liver diseases, medium high and low values in patients with different disease groups. In this unselected patient population only one third of AMA positive patients had an established diagnosis of PBC, about 10% a diagnosis of a systemic autoimmune disease and 3 % had other organ-specific autoimmune diseases. It can be concluded that, although high titers of antibodies against

  17. Antibodies against Hepatitis A and Hepatitis B Virus in Intravenous Immunoglobulin Products.

    Science.gov (United States)

    Lee, Soyoung; Kim, Han Wool; Kim, Kyung Hyo

    2016-12-01

    The worldwide seroprevalence of hepatitis A virus (HAV) and hepatitis B virus (HBV) has changed over the last two decades, indicating a declining incidence of HAV and HBV infections. Therefore, vaccinations against HAV and HBV are recommended for unimmunized people before traveling to an endemic area. Unfortunately, primary antibody deficiency (PAD) patients can only obtain humoral immunity through intravenous immunoglobulin G (IVIG) replacement and not from vaccination because of a defect in antibody production. However, few studies have analyzed the titers of antibodies against HAV or HBV in IVIG products. In this study, the titers of anti-HAV and anti-HBs antibodies were measured in nineteen lots of IVIG products from five manufacturers from three countries (A, B from Korea; C, D from Japan; and E from the USA), and trough titers in plasma were estimated. Concentrations of anti-HAV antibody ranged from 1,888-8,927 mIU/mL and estimated trough titers exceeded the minimal protective value in all evaluated IVIG products. Concentrations of anti-HBs antibody ranged from 438-965 mIU/mL in products A and B and were 157, 123, and 1,945 mIU/mL in products C, D, and E, respectively. Estimated trough titers in products A, B, and E exceeded the minimal protective value but those in products C and D did not reach this threshold. These data demonstrated that available IVIG products generally provide sufficient antibodies against HAV and HBV to protect patients with PAD, although the trough concentrations of anti-HBs antibody in two IVIG products did not reach the minimum protective value.

  18. Otitis-Prone Children Produce Functional Antibodies to Pneumolysin and Pneumococcal Polysaccharides.

    Science.gov (United States)

    Kirkham, Lea-Ann S; Wiertsema, Selma P; Corscadden, Karli J; Mateus, Tulia; Mullaney, Gemma L; Zhang, Guicheng; Richmond, Peter C; Thornton, Ruth B

    2017-03-01

    The pneumococcus is a major otitis media (OM) pathogen, but data are conflicting regarding whether otitis-prone children have impaired humoral immunity to pneumococcal antigens. We and others have shown that otitis-prone and healthy children have similar antibody titers to pneumococcal proteins and polysaccharides (vaccine and nonvaccine types); however, the quality of antibodies from otitis-prone children has not been investigated. Antibody function, rather than titer, is considered to be a better correlate of protection from pneumococcal disease. Therefore, we compared the capacities of antibodies from otitis-prone (cases) and healthy (controls) children to neutralize pneumolysin, the pneumococcal toxin currently in development as a vaccine antigen, and to opsonize pneumococcal vaccine and nonvaccine serotypes. A pneumolysin neutralization assay was conducted on cholesterol-depleted complement-inactivated sera from 165 cases and 61 controls. A multiplex opsonophagocytosis assay (MOPA) was conducted on sera from 20 cases and 20 controls. Neutralizing and opsonizing titers were calculated with antigen-specific IgG titers to determine antibody potency for pneumolysin, pneumococcal conjugate vaccine (PCV) polysaccharides, and non-PCV polysaccharides. There was no significant difference in antibody potencies between cases and controls for the antigens tested. Antipneumolysin neutralizing titers increased with the number of episodes of acute OM, but antibody potency did not. Pneumolysin antibody potency was lower in children colonized with pneumococci than in noncarriers, and this was significant for the otitis-prone group (P otitis-prone children demonstrates that they respond to the current PCV and are likely to respond to pneumolysin-based vaccines as effectively as healthy children. Copyright © 2017 Kirkham et al.

  19. Kinetics of Epstein-Barr Virus (EBV) Neutralizing and Virus-Specific Antibodies after Primary Infection with EBV.

    Science.gov (United States)

    Bu, Wei; Hayes, Gregory M; Liu, Hui; Gemmell, Lorraine; Schmeling, David O; Radecki, Pierce; Aguilar, Fiona; Burbelo, Peter D; Woo, Jennifer; Balfour, Henry H; Cohen, Jeffrey I

    2016-04-01

    Prospective studies of antibodies to multiple Epstein-Barr virus (EBV) proteins and EBV neutralizing antibodies in the same individuals before, during, and after primary EBV infection have not been reported. We studied antibody responses to EBV in college students who acquired primary EBV infection during prospective surveillance and correlated the kinetics of antibody response with the severity of disease. Neutralizing antibodies and enzyme-linked immunosorbent assay (ELISA) antibodies to gp350, the major target of neutralizing antibody, reached peak levels at medians of 179 and 333 days after the onset of symptoms of infectious mononucleosis, respectively. No clear correlation was found between the severity of the symptoms of infectious mononucleosis and the peak levels of antibody to individual viral proteins or to neutralizing antibody. In summary, we found that titers of neutralizing antibody and antibodies to multiple EBV proteins increase over many months after primary infection with EBV. Copyright © 2016, American Society for Microbiology. All Rights Reserved.

  20. Overcoming antigen masking of anti-amyloidbeta antibodies reveals breaking of B cell tolerance by virus-like particles in amyloidbeta immunized amyloid precursor protein transgenic mice

    Directory of Open Access Journals (Sweden)

    Ugen Kenneth E

    2004-06-01

    Full Text Available Abstract Background In prior work we detected reduced anti-Aβ antibody titers in Aβ-vaccinated transgenic mice expressing the human amyloid precursor protein (APP compared to nontransgenic littermates. We investigated this observation further by vaccinating APP and nontransgenic mice with either the wild-type human Aβ peptide, an Aβ peptide containing the "Dutch Mutation", E22Q, or a wild-type Aβ peptide conjugated to papillomavirus virus-like particles (VLPs. Results Anti-Aβ antibody titers were lower in vaccinated APP than nontransgenic mice even when vaccinated with the highly immunogenic Aβ E22Q. One concern was that human Aβ derived from the APP transgene might mask anti-Aβ antibodies in APP mice. To test this possibility, we dissociated antigen-antibody complexes by incubation at low pH. The low pH incubation increased the anti-Aβ antibody titers 20–40 fold in APP mice but had no effect in sera from nontransgenic mice. However, even after dissociation, the anti-Aβ titers were still lower in transgenic mice vaccinated with wild-type Aβ or E22Q Aβ relative to non-transgenic mice. Importantly, the dissociated anti-Aβ titers were equivalent in nontransgenic and APP mice after VLP-based vaccination. Control experiments demonstrated that after acid-dissociation, the increased antibody titer did not cross react with bovine serum albumin nor alpha-synuclein, and addition of Aβ back to the dissociated serum blocked the increase in antibody titers. Conclusions Circulating human Aβ can interfere with ELISA assay measurements of anti-Aβ titers. The E22Q Aβ peptide vaccine is more immunogenic than the wild-type peptide. Unlike peptide vaccines, VLP-based vaccines against Aβ abrogate the effects of Aβ self-tolerance.

  1. Recurrent Potent Human Neutralizing Antibodies to Zika Virus in Brazil and Mexico.

    Science.gov (United States)

    Robbiani, Davide F; Bozzacco, Leonia; Keeffe, Jennifer R; Khouri, Ricardo; Olsen, Priscilla C; Gazumyan, Anna; Schaefer-Babajew, Dennis; Avila-Rios, Santiago; Nogueira, Lilian; Patel, Roshni; Azzopardi, Stephanie A; Uhl, Lion F K; Saeed, Mohsan; Sevilla-Reyes, Edgar E; Agudelo, Marianna; Yao, Kai-Hui; Golijanin, Jovana; Gristick, Harry B; Lee, Yu E; Hurley, Arlene; Caskey, Marina; Pai, Joy; Oliveira, Thiago; Wunder, Elsio A; Sacramento, Gielson; Nery, Nivison; Orge, Cibele; Costa, Federico; Reis, Mitermayer G; Thomas, Neena M; Eisenreich, Thomas; Weinberger, Daniel M; de Almeida, Antonio R P; West, Anthony P; Rice, Charles M; Bjorkman, Pamela J; Reyes-Teran, Gustavo; Ko, Albert I; MacDonald, Margaret R; Nussenzweig, Michel C

    2017-05-04

    Antibodies to Zika virus (ZIKV) can be protective. To examine the antibody response in individuals who develop high titers of anti-ZIKV antibodies, we screened cohorts in Brazil and Mexico for ZIKV envelope domain III (ZEDIII) binding and neutralization. We find that serologic reactivity to dengue 1 virus (DENV1) EDIII before ZIKV exposure is associated with increased ZIKV neutralizing titers after exposure. Antibody cloning shows that donors with high ZIKV neutralizing antibody titers have expanded clones of memory B cells that express the same immunoglobulin VH3-23/VK1-5 genes. These recurring antibodies cross-react with DENV1, but not other flaviviruses, neutralize both DENV1 and ZIKV, and protect mice against ZIKV challenge. Structural analyses reveal the mechanism of recognition of the ZEDIII lateral ridge by VH3-23/VK1-5 antibodies. Serologic testing shows that antibodies to this region correlate with serum neutralizing activity to ZIKV. Thus, high neutralizing responses to ZIKV are associated with pre-existing reactivity to DENV1 in humans. Copyright © 2017 Elsevier Inc. All rights reserved.

  2. Reaktivitas Antibodi Poliklonal SSV terhadap Antigen Homolog dan Heterolog

    Directory of Open Access Journals (Sweden)

    Sri Sulandari

    1998-07-01

    Full Text Available Polyclonal antibodies for Soybean Stunt Virus (SSV were produced in white rabbit through the following procedures: approximately 100 mg of purified virions emulsified in Complete Freund’s Adjuvant (CFA were injected intramuscularly first. In the second and third injection 150 mg of purified virions in Incomplete Freund’s Adjuvant (IFA per injection were injected intramuscularly. Finally, about 300 mg of purified virions were injected intravenously as a booster. The injection were done at 2 weeks interval. Antiserum was collected 5 days after the final injection. Antisera was purified by precipitation in saturated ammonium sulfate. Purified antibody was tested for the titer and reactivity of antibodies against the homologous and heterologous antigen. The studies were conducted with non-precoated I-ELISA test. This research was able to obtain about 25 ml of crude antisera for SSV, the concentration of purified polyclonal antibodies was about 9 mg/ml. the titer of polyclonal antibodies was 10.000 in I-ELISA. Without absorbtion with sap of healthy plant, the antibodies could not be use to identify the infected and healthy plant samples. In the following test, the absorbed antibody was used. Using antibodies to SSV at a dilution of 1:1000 and 1:10.000 against sap extracts sample of healthy and infected plant at a dilution of 1:10 by non-precoated I-ELISA test, indicated that the antibody could be used to identify the healthy and infected samples. By the same test, the antibody could be reacted to both homologous antigen (SSV and heterologous antigen (CMV isolated from banana. Key words: SSV, polyclonal antibodies, ELISA

  3. Elevated antimeasles antibody titre: An association in autoimmune encephalitis

    Directory of Open Access Journals (Sweden)

    S R Chandra

    2015-01-01

    Full Text Available Introduction: Autoimmune encephalitis is a group of treatable noninfective encephalitic disorders with great clinical implications. They have a close resemblance to prion disease and some slow virus infections. We report the presence of significant titers of antimeasles antibody in some of our patients with autoimmune encephalitis resulting in diagnostic and therapeutic problems. Patients and Methods: Patients seen by us in the last 4 years with high titers (1:625 dilution cerebrospinal fiuid (CSF antimeasles antibody positivity were reviewed retrospectively. The data collected were assessed using SPSS- Statistical Package for Social Sciences Version 15.0 (IBM corporation software. The groups which showed elevated antimeasles antibody titers but did not have other parameters suggestive of subacute sclerosing panencephalitis (Group 2 were segregated and compared with those who had the typical features (Group 1 using Fisher's Exact Test. Results: There were 33 patients with antimeasles antibody in CSF. Group 1 had 27 and Group 2 had 6 patients. Group 1 had lower age, cognitive dysfunction, slow myoclonus, less generalized tonic-clonic seizures, and focal seizures. Group 2 patients belonged to the higher age, had significant psychosis (P = 0.02, incontinence of bowel and bladder (P = 0.0001. Slow myoclonus was significant in the first group (P = 0.028, and weakness was significant in the second group (P = 0.028 and double incontinence in the second group (P = 0.0001. Magnetic resonance imaging showed significant gray matter and cerebellar involvement in Group 2 P = 0.005 and P = 0.028, respectively. Conclusions: Patients who show significant titers of antimeasles antibodies in the CSF but belonging to older age group with psychosis, generalized tonic-clonic seizures, double incontinence, focal myoclonus, and electroencephalographic and imaging noncorroborative need to be investigated for autoimmune encephalitis in view of the great prognostic and

  4. Application of the polymerase chain reaction in determination of recombinant retrovirus titers as fifty percent endpoints

    DEFF Research Database (Denmark)

    Husemoen, L L; Gram, G J; Hansen, J E

    2000-01-01

    , determination of virus titer involves the testing of culture medium from individual packaging cell lines for the ability to transfer drug resistance to susceptible cells - a process that can easily take up to 14 days. It is generally agreed that this method is cumbersome. We sought to develop PCR-based...... protocols that would significantly simplify and shorten this procedure. Using PCR and primers specific for the Neoregion of the MLV-derived vector LeGSN, we determined 1. the proviral integration in target cells, and 2. the viral nucleic acid (RNA or DNA) content of the vector stock. Results were compared...... with those using the conventional method. We found that these specific PCR-based procedures were indeed useful for rapid determination of viral titers as well as for quick screening for high-titer vector-producing cell clones and successful transduction of target cells....

  5. Influence of mother VDRL titers on the outcome of newborns with congenital syphilis.

    Science.gov (United States)

    Vasquez-Manzanilla, Omira; Dickson-Gonzalez, Sonia M; Salas, José G; Teguedor, Luis E; Rodriguez-Morales, Alfonso J

    2008-04-01

    Congenital syphilis still represents a significant public health problem worldwide, and particularly in developing countries. Despite years of research on different clinical and immunological features, many physiopathological aspects still lacks of knowledge, one of them the role of immune response against Treponema pallidum by infected mothers on the birth outcomes, e.g. birthweight. In this study we analyzed if the mother VDRL titers were significantly associated with the birthweight of newborns with congenital syphilis. We observed a highly significant association between both variables, finding at the linear regression that with higher mother VDRL titers, the newborn birthweight was lower (p=0.0345). We identified that higher VDRL titers are associated with lower birth weights, although the physiopathological reasons to explain this still remains unclear.

  6. An anti-nuclear antibody-negative patient with systemic lupus erythematosus (SLE) accompanied with anti-ribosomal P antibody (anti-P).

    Science.gov (United States)

    Sugisaki, Kota; Takeda, Isao; Kanno, Takashi; Nogai, Syoji; Abe, Kunio; Sakuma, Hideo; Kasukawa, Reiji

    2002-11-01

    We report a case of an anti-nuclear antibody (ANA)-negative patient with systemic lupus erythematosus (SLE) accompanied with anti-phospholipid antibody syndrome (APS) and lupus nephritis (LN). Histological examination of placenta obtained by an artificially-induced abortion revealed multiple thromboses in the placental villi. Histology of biopsied kidney tissue revealed minimal change with deposits of immunoglobulin and complement. Anti-ribosomal P antibodies (anti-P) and lupus anticoagulant (LAC) were positive and anti-double stranded DNA antibody (anti-DNA) showed only a slightly positive titer in her serum. The intensity of proteinuria of the patient was correlated with the anti-P, but not anti-DNA titers.

  7. Investigations on the presence of antibodies against equine herpesvirus-1 in blood serum of foals, prior to and after colostrum intake

    Directory of Open Access Journals (Sweden)

    Lauš Saša

    2015-01-01

    Full Text Available The titer of specific antibodies against equine herpesvirus-1 in blood serum was tested in two groups of mares and their foals. The first group consisted of 12 mares, Standardbred and Serbian Trotter breed, who were vaccinated against equine herpesvirus-1 and 4 in the 5th, 7th and 9th month of pregnancy. On the contrary, 12 mares from the second group, of Lipizzaner breed, were not vaccinated. The mares’ blood samples for antibodies titer investigation were taken 30, 15 and 7 days before the expected partus, then immediately after the partus, while their foals’ blood samples were taken immediately after foaling, then just before colostrum intake, and finally 1, 2, 3 and 7 days later. The titer of antibodies against equine herpesvirus-1 was tested by the method of virus - neutralization, on microtiter plates with constant dose of the virus and serial double dilutions of the serum. In unvaccinated mares, titer of antibodies against equine herpesvirus-1 was either low or not present, but on the contrary, in the vaccinated ones the antibodies titer ranged from 1:32 to 1:256. In the foals originating from both vaccinated and unvaccinated there were not found specific antibodies in the serum before colostrum intake. After the colostrum intake, the values of specific antibodies against equine herpesvirus-1 significantly increased in the foals originating from the vaccinated mares, and ranged from 1:8 to 1:32.

  8. A Knowledge-based Recommendation Framework using SVN Numbers

    Directory of Open Access Journals (Sweden)

    Roddy Cabezas Padilla

    2017-06-01

    Full Text Available Current knowledge based recommender systems, despite proven useful and having a high impact, persist with some shortcomings. Among its limitations are the lack of more flexible models and the inclusion of indeterminacy of the factors involved for computing a global similarity.

  9. Evidence that active protection following oral immunization of mice with live rotavirus is not dependent on neutralizing antibody.

    Science.gov (United States)

    Ward, R L; McNeal, M M; Sheridan, J F

    1992-05-01

    Studies were performed to determine whether active immunity against murine rotavirus (EDIM) infection of mice correlated with titers of neutralizing antibody to the challenge virus. Neonatal mice administered either murine or heterologous rotaviruses all developed diarrhea and high titers of serum rotavirus IgG. However, only mice given EDIM, the murine EB, or simian SA11-FEM strains were protected against EDIM infection when challenged 60 days later. Other serotype 3 strains (RRV, SA11-SEM), as well as strains belonging to serotypes 5 and 6 (OSU, NCDV, WC3), were not protective. Serum neutralizing antibody titers to EDIM were almost undetectable after rotavirus infection with any strain and could not, therefore, be correlated with protection. Likewise, intestinal neutralizing antibody titers were extremely low 21 days after EDIM infection, and by 60 days after inoculation, EDIM-infected mice had no greater intestinal neutralizing antibody titers than uninoculated controls. Mice inoculated with SA11-FEM as neonates had much higher serum rotavirus IgG responses than mice inoculated as adults, and only those infected with this virus as neonates were protected. Thus, although immunity to EDIM did not correlate with the presence of neutralizing antibody to EDIM, it did correlate with the overall magnitude of the immune response after inoculation with SA11-FEM.

  10. Decreased vaccine antibody titers following exposure to multiple metals and metalloids in e-waste-exposed preschool children

    NARCIS (Netherlands)

    Lin, Xinjiang; Xu, Xijin; Zeng, Xiang; Xu, Long; Zeng, Zhijun; Huo, Xia

    We explored acquired immunity resulting from vaccination in 3 to 7-year-old children, chronically exposed to multiple heavy metals and metalloids, in an e-waste recycling area (Guiyu, China). Child blood levels of ten heavy metals and metalloids, including lead (Pb), arsenic (As), mercury (Hg),

  11. Epidemiological associations between Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae antibody titers and lung lesions in Prince Edward Island swine herds.

    Science.gov (United States)

    Van Til, L D; Dohoo, I R; Morley, R S

    1991-01-01

    A survey of anteroventral (AV) lung lesions, pleuritis and serology for Mycoplasma hyopneumoniae (MH) and Actinobacillus pleuropneumoniae (AP) was conducted on a minimum of 25 slaughter hogs from each of 18 randomly sampled Prince Edward Island farms (producing over 1,000 market hogs per year). The data were analyzed to evaluate the potential role of these two agents as risk factors for the two conditions, using crude and multivariable techniques, as well as individual and herd data. Anteroventral lung lesions were present in 50.5% of hogs at slaughter, and pleuritis was present in 15.4% of the hogs. Least squares multivariable regression was used to analyze the simultaneous ability of MH, AP and MH/AP interaction to predict the herd prevalence of AV lung lesions. Only MH was associated with AV lung lesions (p = 0.035). In spite of this statistical significance, MH accounted for only 53% of the herd variation in prevalence of lung lesions (R2 = 0.529). As well, some herds maintained very low levels of lung lesions despite moderate (up to 30%) prevalence of MH. Discrepancies between the analytic techniques suggested herd-level factors play an important role in the development of lung lesions. Pleuritis did not appear to be associated with either of the agents studied (p = 0.478). PMID:1790490

  12. Drug-induced Hypersensitivity Syndrome Associated with a Marked Increase in Anti-paramyxovirus Antibody Titers in a Scleroderma Patient

    Directory of Open Access Journals (Sweden)

    Taio Naniwa

    2007-01-01

    Discussion: These findings suggest that paramyxovirus infection had contributed to the development of DIHS in this patient and that there is a need to seek evidence of other viral infections in some cases of DIHS, especially those without herpes virus reactivation/infection.

  13. Interleukin-15 Increases Vaccine Efficacy through a Mechanism Linked to Dendritic Cell Maturation and Enhanced Antibody Titers

    Science.gov (United States)

    2007-11-26

    of STEBVax, 143 g of alhydrogel ( Alh ), and 0.1 g, 0.5 g, or 5 g of IL-15/mouse in a 200-l volume of PBS. The ratio of vaccine to alhydrogel was 1...Coadministration of IL-15 with STEBVax and alhydrogel ( Alh ) increased the protection of mice from lethal SEB toxin chal- lenge. (A) BALB/c mice were vaccinated with

  14. Single immunization with a suboptimal antigen dose encapsulated into polyanhydride microparticles promotes high titer and avid antibody responses

    Science.gov (United States)

    Microparticle adjuvants based on biodegradable polyanhydrides were used to provide controlled delivery of a model antigen, ovalbumin (Ova), to mice. Ova was encapsulated into two different polyanhydride microparticle formulations to evaluate the influence of polymer chemistry on the nature and magn...

  15. Bovine coronavirus antibody titers at weaning negatively correlate with incidence of bovine respiratory disease in the feed yard

    Science.gov (United States)

    Bovine respiratory disease complex (BRDC) is a multifactorial disease caused by complex interactions among viral and bacterial pathogens, stressful management practices and host genetic variability. Although vaccines and antibiotic treatments are readily available to prevent and treat infection caus...

  16. OBJECTIVE QUANTITATION OF SERUM ANTIBODY-TITERS AGAINST ENTEROBACTERIACEAE USING INDIRECT IMMUNOFLUORESCENCE, READ BY VIDEOCAMERA AND IMAGE-PROCESSING SYSTEM

    NARCIS (Netherlands)

    APPERLOORENKEMA, HZ; WILKINSON, MHF; OENEMA, DG; VANDERWAAIJ, D

    1991-01-01

    A new way of measuring indirect immunofluorescence (IIF) of microscopic bacterial slide preparations by videocamera and an image processing system is presented. This method is compared with the conventional method of reading the slides by eye. The advantages of this new approach are objective

  17. Correlation Between Hepatitis B Surface Antigen Titers and HBV DNA Levels

    OpenAIRE

    Amal Alghamdi; Nagwa Aref; Malak El-Hazmi; Waleed Al-Hamoudi; Khalid Alswat; Ahmed Helmy; Sanai, Faisal M; Abdo, Ayman A.

    2013-01-01

    Background/Aim: To assess the correlation between serum HBsAg titers and hepatitis B virus (HBV) DNA levels in patients with hepatitis B envelop antigen-negative (HBeAg −ve) HBV genotype-D (HBV/D) infection. Patients and Methods: A total of 106 treatment- naïve, HBeAg −ve HBV/D patients were included; 78 in the inactive carrier (IC) state and 28 in the active hepatitis (AH) stage. HBV DNA load and HBsAg titers were tested using TaqMan real-time polymerase chain reaction (PCR) and automated ch...

  18. Antigen-specific H1N1 influenza antibody responses in acute respiratory tract infections and their relation to influenza infection and disease course.

    Science.gov (United States)

    Haran, John Patrick; Hoaglin, David C; Chen, Huaiqing; Boyer, Edward W; Lu, Shan

    2014-08-01

    Early antibody responses to influenza infection are important in both clearance of virus and fighting the disease. Acute influenza antibody titers directed toward H1-antigens and their relation to infection type and patient outcomes have not been well investigated. Using hemagglutination inhibition (HI) assays, we aimed to characterize the H1-specific antibody titers in patients with influenza infection or another respiratory infection before and after the H1N1-pandemic influenza outbreak. Among patients with acute influenza infection we related duration of illness, severity of symptoms, and need for hospitalization to antibody titers. There were 134 adult patients (average age 34.7) who presented to an urban academic emergency department (ED) from October through March during the 2008-2011 influenza seasons with symptoms of fever and a cough. Nasal aspirates were tested by viral culture, and peripheral blood serum was run in seven H1-subtype HI assays. Acutely infected influenza patients had markedly lower antibody titers for six of the seven pseudotype viruses. For the average over the seven titers (log units, base 2) their mean was 7.24 (95% CI 6.88, 7.61) compared with 8.60 (95% CI 8.27, 8.92) among patients who had a non-influenza respiratory illness, pinfection, titers of some antibodies correlated with severity of symptoms and with total duration of illness (pacute respiratory infections, lower concentrations of H1-influenza-specific antibodies were associated with influenza infection. Among influenza-infected patients, higher antibody titers were present in patients with a longer duration of illness and with higher severity-of-symptom scores. Copyright © 2014 Elsevier B.V. All rights reserved.

  19. Chimeric antibodies.

    Science.gov (United States)

    Kurosawa, Kohei; Lin, Waka; Ohta, Kunihiro

    2014-01-01

    Here we describe a detailed protocol for the one-step preparation of antigen-specific human chimeric immunoglobulin G (IgG) monoclonal antibodies (mAbs) using an in vitro antibody design method referred to as the ADLib (Autonomously Diversifying Library) system. This method employs a chicken B cell line DT40-based library in which the variable regions of the Ig gene loci have been highly diversified by treatment with the histone deacetylase inhibitors. DT40 cells express both membrane-bound and secreted forms of chicken IgM. This property allows a rapid screening and selection of antibody-producing B cells from the library by using magnetic beads conjugated with any antigen of interest. To apply the ADLib system to the direct generation of human chimeric antibody, we have inserted a DNA segment coding for the constant region of human IgG into the chicken IgM heavy-chain locus of DT40 cells by homologous gene targeting. By a mechanism of alternative splicing, the resulting DT40 strain simultaneously expresses chimeric human IgG that contain the same Ig variable region sequences as the membrane-bound chicken IgM displayed at the cell surface. Application of the ADLib system to this human Ig-inserted DT40 strain enables the one-step isolation of human chimeric IgG that is specific for any antigen of interest and can be easily purified for immediate use.

  20. Antibody biotechnology

    African Journals Online (AJOL)

    STORAGESEVER

    2009-07-06

    Jul 6, 2009 ... from somatic recombination between variable genes, was made. This topic has preoccupied immunologists includ- ing Ehrlich (side chain theory), Jerne .... natural naïve libraries, syn- thetic naïve and semi-synthetic libraries. Immune antibody libraries. These libraries are constructed with VH (VDJ) and VL.

  1. Catalytic Antibodies

    Indian Academy of Sciences (India)

    systemic lupus erythematosus, multiple sclerosis and rheumatoid arthritis. The importance of natural immunological mechanisms in pro- ducing artificial catalysts is exemplified by the reports describing increased synthesis of esterase antibodies in autoimmune mice compared to normal mice in response to transition-state ...

  2. Cross-reactive antibodies in convalescent SARS patients' sera against the emerging novel human coronavirus EMC (2012) by both immunofluorescent and neutralizing antibody tests.

    Science.gov (United States)

    Chan, Kwok-Hung; Chan, Jasper Fuk-Woo; Tse, Herman; Chen, Honglin; Lau, Candy Choi-Yi; Cai, Jian-Piao; Tsang, Alan Ka-Lun; Xiao, Xincai; To, Kelvin Kai-Wang; Lau, Susanna Kar-Pui; Woo, Patrick Chiu-Yat; Zheng, Bo-Jiang; Wang, Ming; Yuen, Kwok-Yung

    2013-08-01

    A severe acute respiratory syndrome (SARS)-like disease due to a novel betacoronavirus, human coronavirus EMC (HCoV-EMC), has emerged recently. HCoV-EMC is phylogenetically closely related to Tylonycteris-bat-coronavirus-HKU4 and Pipistrellus-bat-coronavirus-HKU5 in Hong Kong. We conducted a seroprevalence study on archived sera from 94 game-food animal handlers at a wild life market, 28 SARS patients, and 152 healthy blood donors in Southern China to assess the zoonotic potential and evidence for intrusion of HCoV-EMC and related viruses into humans. Anti-HCoV-EMC and anti-SARS-CoV antibodies were detected using screening indirect immunofluorescence (IF) and confirmatory neutralizing antibody tests. Two (2.1%) animal handlers had IF antibody titer of ≥ 1:20 against both HCoV-EMC and SARS-CoV with neutralizing antibody titer of SARS patients had significant IF antibody titers with 7/28 (25%) having anti-HCoV-EMC neutralizing antibodies at low titers which significantly correlated with that of HCoV-OC43. Bioinformatics analysis demonstrated a significant B-cell epitope overlapping the heptad repeat-2 region of Spike protein. Virulence of SARS-CoV over other betacoronaviruses may boost cross-reactive neutralizing antibodies against other betacoronaviruses. Convalescent SARS sera may contain cross-reactive antibodies against other betacoronaviruses and confound seroprevalence study for HCoV-EMC. Copyright © 2013 The British Infection Association. Published by Elsevier Ltd. All rights reserved.

  3. Relationship between periodontitis-related antibody and frequent exacerbations in chronic obstructive pulmonary disease.

    Directory of Open Access Journals (Sweden)

    Tamaki Takahashi

    Full Text Available BACKGROUND: To identify patients with chronic obstructive pulmonary disease (COPD who are susceptible to frequent exacerbations is important. Although periodontitis aggravated by poor oral hygiene might increase the risk of lower respiratory tract infection, the relationship between periodontitis and COPD exacerbations remains unknown. This prospective cohort study investigates the relationship between periodontitis-related antibody and exacerbation frequency over a one-year period. METHODS: We assessed an IgG antibody titer against Porphyromonas gingivalis, which is a major pathogen of periodontitis, and then prospectively followed up 93 individuals over one year to detect exacerbations. RESULTS: The numbers of exacerbations and the rate of individuals with frequent exacerbations (at least two per year were significantly lower in patients with higher IgG titer than those with normal IgG titer (0.8 vs. 1.2 per year, p= 0.045 and 14.3 vs. 38.6%, p= 0.009, respectively. Multivariate logistic regression analysis showed that being normal-IgG titer for periodontitis-related antibody significantly increased the risk of frequent exacerbations (relative risk, 5.27, 95% confidence interval, 1.30-25.7; p = 0.019 after adjusting for other possible confounders, such as a history of exacerbations in the past year, disease severity, COPD medication and smoking status. CONCLUSIONS: Normal-IgG titer for periodontitis-related antibody can be an independent predictor of frequent exacerbations. Measuring periodontitis-related antibody titers might be useful to identify patients with susceptibility to frequent exacerbations so that an aggressive prevention strategy can be designed.

  4. Presence of Autoimmune Antibody in Chikungunya Infection

    Directory of Open Access Journals (Sweden)

    Wirach Maek-a-nantawat

    2009-01-01

    Full Text Available Chikungunya infection has recently re-emerged as an important arthropod-borne disease in Thailand. Recently, Southern Thailand was identified as a potentially endemic area for the chikungunya virus. Here, we report a case of severe musculoskeletal complication, presenting with muscle weakness and swelling of the limbs. During the investigation to exclude autoimmune muscular inflammation, high titers of antinuclear antibody were detected. This is the report of autoimmunity detection associated with an arbovirus infection. The symptoms can mimic autoimmune polymyositis disease, and the condition requires close monitoring before deciding to embark upon prolonged specific treatment with immunomodulators.

  5. The IgM Response to Modified LDL in Experimental Atherosclerosis Hypochlorite-modified LDL IgM Antibodies versus Classical Natural T15 IgM Antibodies

    NARCIS (Netherlands)

    van Leeuwen, Marcella; Damoiseaux, Jan; Duijvestijn, Adriaan; Heeringa, Peter; Gijbels, Marion; de Winther, Menno; Tervaert, Jan Willem Cohen; Shoenfeld, Y; Gershwin, ME

    2009-01-01

    Introduction: It is hypothesized that IgM antibodies to oxidized LDL are anti-atherogenic. Myeloperoxidase from plaque-infiltrating neutrophils catalyzes the production of hypochlorite (HOCl), which oxidizes LDL. Here we study the IgM response to HOCl-modified LDL in comparison to titers of T15

  6. The IgM response to modified LDL in experimental atherosclerosis: hypochlorite-modified LDL IgM antibodies versus classical natural T15 IgM antibodies

    NARCIS (Netherlands)

    van Leeuwen, Marcella; Damoiseaux, Jan; Duijvestijn, Adriaan; Heeringa, Peter; Gijbels, Marion; de Winther, Menno; Tervaert, Jan Willem Cohen

    2009-01-01

    It is hypothesized that IgM antibodies to oxidized LDL are anti-atherogenic. Myeloperoxidase from plaque-infiltrating neutrophils catalyzes the production of hypochlorite (HOCl), which oxidizes LDL. Here we study the IgM response to HOCl-modified LDL in comparison to titers of T15 clonotypic natural

  7. Antiphospholipid antibodies in Brazilian hepatitis C virus carriers

    Directory of Open Access Journals (Sweden)

    A.M. Atta

    2008-06-01

    Full Text Available Hepatitis C, a worldwide viral infection, is an important health problem in Brazil. The virus causes chronic infection, provoking B lymphocyte dysfunction, as represented by cryoglobulinemia, non-organ-specific autoantibody production, and non-Hodgkin's lymphoma. The aim of this research was to screen for the presence of antiphospholipid autoantibodies in 109 Brazilian hepatitis C virus carriers without clinical history of antiphospholipid syndrome. Forty healthy individuals were used as the control group. IgA, IgG, and IgM antibodies against cardiolipin and β2-glycoprotein I were measured with an enzyme-linked immunosorbent assay, using a cut-off point of either 20 UPL or 20 SBU. While 24 (22.0% hepatitis C carriers had moderate titers of IgM anticardiolipin antibodies (median, 22.5 MPL; 95%CI: 21.5-25.4 MPL, only three carriers (<3% had IgG anticardiolipin antibodies (median, 23 GPL; 95%CI: 20.5-25.5 GPL. Furthermore, IgA anticardiolipin antibodies were not detected in these individuals. Male gender and IgM anticardiolipin seropositivity were associated in the hepatitis C group (P = 0.0004. IgA anti-β2-glycoprotein-I antibodies were detected in 29 of 109 (27.0% hepatitis C carriers (median, 41 SAU; 95%CI: 52.7-103.9 SAU. Twenty patients (18.0% had IgM anti-β2-glycoprotein I antibodies (median, 27.6 SMU; 95%CI: 23.3-70.3 SMU, while two patients had IgG antibodies against this protein (titers, 33 and 78 SGU. Antiphospholipid antibodies were detected in only one healthy individual, who was seropositive for IgM anticardiolipin. We concluded that Brazilian individuals chronically infected with hepatitis C virus present a significant production of antiphospholipid antibodies, mainly IgA anti-β2-glycoprotein I antibodies, which are not associated with clinical manifestations of antiphospholipid syndrome.

  8. Age affects quantity but not quality of antibody responses after vaccination with an inactivated flavivirus vaccine against tick-borne encephalitis.

    Directory of Open Access Journals (Sweden)

    Karin Stiasny

    Full Text Available The impairment of immune functions in the elderly (immunosenescence results in post-vaccination antibody titers that are significantly lower than in young individuals. It is, however, a controversial question whether also the quality of antibodies declines with age. In this study, we have therefore investigated the age-dependence of functional characteristics of antibody responses induced by vaccination with an inactivated flavivirus vaccine against tick-borne encephalitis (TBE. For this purpose, we quantified TBE virus-specific IgG and neutralizing antibody titers in post-vaccination sera from groups of young and elderly healthy adults and determined antibody avidities and NT/ELISA titer ratios (functional activity. In contrast to the quantitative impairment of antibody production in the elderly, we found no age-related differences in the avidity and functional activity of antibodies induced by vaccination, which also appeared to be independent of the age at primary immunization. There was no correlation between antibody avidity and NT/ELISA ratios suggesting that additional factors affect the quality of polyclonal responses, independent of age. Our work indicates that healthy elderly people are able to produce antibodies in response to vaccination with similar avidity and functional activity as young individuals, albeit at lower titers.

  9. Development of enhanced antibody response toward dual delivery of nano-adjuvant adsorbed human Enterovirus-71 vaccine encapsulated carrier

    OpenAIRE

    Saeed, Mohamed I; Omar, Abdul Rahman; Hussein, Mohd Z; Elkhidir, Isam M.; Sekawi, Zamberi

    2015-01-01

    This study introduces a new approach for enhancing immunity toward mucosal vaccines. HEV71 killed vaccine that is formulated with nanosize calcium phosphate adjuvant and encapsulated onto chitosan and alginate delivery carriers was examined for eliciting antibody responses in serum and saliva collected at weeks 0, 1, 3, 5, 7 and 9 for viral-specific IgA & IgG levels and viral neutralizing antibody titers. The antibody responses induced in rabbits by the different formulations delivered by a s...

  10. The development of a prototype of a “rapid test” for detection of equine antibodies against tetanus

    OpenAIRE

    Stelzmann, Mareike

    2011-01-01

    the following dissertation, the prototype of a “rapid test” for detection of equine antibodies against tetanus is developed. This test makes it possible to detect antibodies against tetanus in equine serum within one hour. Moreover the prototype allows making a statement about the antibody titer. The standard values of the OIE (WORLD ORGANISATION FOR ANIMAL HEALTH, 2009) to validate in vitro-diagnostical tests for veterinary medicine were followed. The rapid test achieves results comparabl...

  11. Toxoplasmosis Titers and past Suicide Attempts Among Older Adolescents Initiating SSRI Treatment.

    Science.gov (United States)

    Coryell, William; Yolken, Robert; Butcher, Brandon; Burns, Trudy; Dindo, Lilian; Schlechte, Janet; Calarge, Chadi

    2016-01-01

    Latent infection with toxoplasmosis is a prevalent condition that has been linked in animal studies to high-risk behaviors, and in humans, to suicide and suicide attempts. This analysis investigated a relationship between suicide attempt history and toxoplasmosis titers in a group of older adolescents who had recently begun treatment with an SSRI. Of 108 participants, 17 (15.7 %) had a lifetime history of at least one suicide attempt. All were given structured and unstructured diagnostic interviews and provided blood samples. Two individuals (11.9%) with a past suicide attempt, and two (2.1%) without this history, had toxoplasmosis titers ≥ 10 IU/ml (p = 0.166). Those with a past suicide attempt had mean toxoplasmosis titers that were significantly different (p = 0.018) from those of patients who lacked this history. An ROC analysis suggested a lower optimal threshold for distinguishing patients with and without suicide attempts (3.6 IU/ml) than that customarily used to identify seropositivity. Toxoplasmosis titers may quantify a proneness to suicidal behavior in younger individuals being treated with antidepressants.

  12. Aphid performance changes with plant defense mediated by Cucumber mosaic virus titer.

    Science.gov (United States)

    Shi, Xiaobin; Gao, Yang; Yan, Shuo; Tang, Xin; Zhou, Xuguo; Zhang, Deyong; Liu, Yong

    2016-04-22

    Cucumber mosaic virus (CMV) causes appreciable losses in vegetables, ornamentals and agricultural crops. The green peach aphid, Myzus persicae Sulzer (Aphididae) is one of the most efficient vectors for CMV. The transmission ecology of aphid-vectored CMV has been well investigated. However, the detailed description of the dynamic change in the plant-CMV-aphid interaction associated with plant defense and virus epidemics is not well known. In this report, we investigated the relationship of virus titer with plant defense of salicylic acid (SA) and jasmonic acid (JA) during the different infection time and their interaction with aphids in CMV-infected tobacco plants. Our results showed that aphid performance changed with virus titer and plant defense on CMV-inoculated plants. At first, plant defense was low and aphid number increased gradually. The plant defense of SA signaling pathway was induced when virus titer was at a high level, and aphid performance was correspondingly reduced. Additionally, the winged aphids were increased. Our results showed that aphid performance was reduced due to the induced plant defense mediated by Cucumber mosaic virus titer. Additionally, some wingless aphids became to winged aphids. In this way CMV could be transmitted with the migration of winged aphids. We should take measures to prevent aphids in the early stage of their occurrence in the field to prevent virus outbreak.

  13. TITER AND PRODUCT AFFECTS THE DISTRIBUTION OF GENE EXPRESSION AFTER INTRAPUTAMINAL CONVECTION-ENHANCED DELIVERY

    Science.gov (United States)

    Emborg, Marina E.; Hurley, Samuel A.; Joers, Valerie; Tromp, Do P.M.; Swanson, Christine R.; Ohshima-Hosoyama, Sachiko; Bondarenko, Viktorya; Cummisford, Kyle; Sonnemans, Marc; Hermening, Stephan; Blits, Bas; Alexander, Andrew L.

    2014-01-01

    Background Efficacy and safety of intracerebral gene therapy for brain disorders, like Parkinson’s disease, depends on appropriate distribution of gene expression. Objectives To assess if the distribution of gene expression is affected by vector titer and protein type. Methods Four adult macaque monkeys seronegative for adeno-associated virus 5 (AAV5) received in the right and left ventral postcommisural putamen 30μl inoculation of a high or low titer suspension of AAV5 encoding glial derived neurotrophic factor (GDNF) or green fluorescent protein (GFP). Inoculations were performed using convection enhanced delivery and intraoperative MRI (IMRI). Results IMRI confirmed targeting and infusion cloud irradiating from the catheter tip into surrounding area. Postmortem analysis six weeks after surgery revealed GFP and GDNF expression ipsilateral to the injection side that had a titer-dependent distribution. GFP and GDNF expression was also observed in fibers in the Substantia Nigra (SN) pars reticulata (pr), demonstrating anterograde transport. Few GFP-positive neurons were present in the SN pars compacta (pc), possibly by direct retrograde transport of the vector. GDNF was present in many SNpc and SNpr neurons. Conclusions After controlling for target and infusate volume, intracerebral distribution of gene product is affected by vector titer and product biology. PMID:24943657

  14. Titer and product affect the distribution of gene expression after intraputaminal convection-enhanced delivery.

    Science.gov (United States)

    Emborg, Marina E; Hurley, Samuel A; Joers, Valerie; Tromp, Do P M; Swanson, Christine R; Ohshima-Hosoyama, Sachiko; Bondarenko, Viktorya; Cummisford, Kyle; Sonnemans, Marc; Hermening, Stephan; Blits, Bas; Alexander, Andrew L

    2014-01-01

    The efficacy and safety of intracerebral gene therapy for brain disorders like Parkinson's disease depends on the appropriate distribution of gene expression. To assess whether the distribution of gene expression is affected by vector titer and protein type. Four adult macaque monkeys seronegative for adeno-associated virus 5 (AAV5) received a 30-µl inoculation of a high- or a low-titer suspension of AAV5 encoding glial cell line-derived neurotrophic factor (GDNF) or green fluorescent protein (GFP) in the right and left ventral postcommissural putamen. The inoculations were conducted using convection-enhanced delivery and intraoperative MRI (IMRI). IMRI confirmed targeting and infusion cloud irradiation from the catheter tip into the surrounding area. A postmortem analysis 6 weeks after surgery revealed GFP and GDNF expression ipsilateral to the injection site that had a titer-dependent distribution. GFP and GDNF expression was also observed in fibers in the substantia nigra (SN) pars reticulata (pr), demonstrating anterograde transport. Few GFP-positive neurons were present in the SN pars compacta (pc), possibly by direct retrograde transport of the vector. GDNF was present in many neurons of the SNpc and SNpr. After controlling for target and infusate volume, the intracerebral distribution of the gene product was affected by the vector titer and product biology.

  15. Antiparietal cell antibody test

    Science.gov (United States)

    APCA; Anti-gastric parietal cell antibody; Atrophic gastritis - anti-gastric parietal cell antibody; Gastric ulcer - anti-gastric parietal cell antibody; Pernicious anemia - anti-gastric parietal cell antibody; ...

  16. Production and characterization of high-titer serum-free cell culture grown hepatitis C virus particles of genotype 1-6.

    Science.gov (United States)

    Mathiesen, Christian K; Jensen, Tanja B; Prentoe, Jannick; Krarup, Henrik; Nicosia, Alfredo; Law, Mansun; Bukh, Jens; Gottwein, Judith M

    2014-06-01

    Recently, cell culture systems producing hepatitis C virus particles (HCVcc) were developed. Establishment of serum-free culture conditions is expected to facilitate development of a whole-virus inactivated HCV vaccine. We describe generation of genotype 1-6 serum-free HCVcc (sf-HCVcc) from Huh7.5 hepatoma cells cultured in adenovirus expression medium. Compared to HCVcc, sf-HCVcc showed 0.6-2.1 log10 higher infectivity titers (4.7-6.2 log10 Focus Forming Units/mL), possibly due to increased release and specific infectivity of sf-HCVcc. In contrast to HCVcc, sf-HCVcc had a homogeneous single-peak density profile. Entry of sf-HCVcc depended on HCV co-receptors CD81, LDLr, and SR-BI, and clathrin-mediated endocytosis. HCVcc and sf-HCVcc were neutralized similarly by chronic-phase patient sera and by human monoclonal antibodies targeting conformational epitopes. Thus, we developed serum-free culture systems producing high-titer single-density sf-HCVcc, showing similar biological properties as HCVcc. This methodology has the potential to advance HCV vaccine development and to facilitate biophysical studies of HCV. Copyright © 2014 Elsevier Inc. All rights reserved.

  17. Neurologic symptoms and neuropathologic antibodies in poultry workers exposed to Campylobacter jejuni.

    Science.gov (United States)

    Price, Lance B; Roess, Amira; Graham, Jay P; Baqar, Shahida; Vailes, Rocio; Sheikh, Kazim A; Silbergeld, Ellen

    2007-07-01

    To examine associations between occupational exposure to live poultry with Campylobacter exposure, Campylobacter-associated neurologic symptoms, and neuropathologic antibodies. Questionnaires, serum samples, and stool specimens were collected from 20 poultry workers and 40 community referents. Campylobacter exposure was evaluated by stool culture and serum antibodies; neurologic symptoms were assessed by questionnaire; and neuropathologic antibodies were measured by serum anti-glycolipid antibody concentrations. Poultry workers had significantly higher anti-Campylobacter immunoglobulin G titers compared with that of referents (P Campylobacter-associated neurologic symptoms; and male poultry workers had a higher point risk estimate for detectable neuropathologic anti-glycolipid immunoglobulin G titers (P = 0.07) compared with male referents. These data suggest that poultry workers are at elevated risk of Campylobacter exposure and may be at elevated risk for Campylobacter-associated neurologic sequelae.

  18. Synthesis and Characterization of Hapten-Protein Conjugates for Antibody Production against Cyanogenic Glycosides.

    Science.gov (United States)

    Bolarinwa, Islamiyat Folashade

    2015-07-01

    Consumption of cyanogenic plants can cause serious health problems for humans. The ability to detect and quantify cyanogenic glycosides, capable of generating cyanide, could contribute to prevention of cyanide poisoning from the consumption of improperly processed cyanogenic plants. Hapten-protein conjugates were synthesized with amygdalin and linamarin by using a novel approach. Polyclonal antibodies were generated by immunizing four New Zealand White rabbits with synthesized amygdalin-bovine serum albumin and linamarin-bovine serum albumin immunogen. This is the first time an antibody was produced against linamarin. Antibody titer curves were obtained from all the four rabbits by using a noncompetitive enzyme-linked immunosorbent assay. High antibody titer was obtained at dilutions greater than 1:50,000 from both immunogens. This new method is an important step forward in preventing ingestion of toxic cyanogenic glycosides.

  19. Comparison of a rapid immunochromatographic assay with an immunofluorescent antibody test for detection of Leishmania infantum antibodies in dogs.

    Science.gov (United States)

    Proverbio, Daniela; Spada, Eva; Perego, Roberta; Baggiani, Luciana; Bagnagatti De Giorgi, Giada; Migliazzo, Antonella; Vitale, Fabrizio

    2016-12-01

    Identification of Leishmania infantum-infected dogs is crucial for control of canine leishmaniosis. In particular, in areas where access to specialized laboratories is limited, the availability of reliable and rapid in-clinic serologic tests may support immediate diagnosis in suspected cases and permit detection of asymptomatic canine carriers of L infantum infection. The purpose of the study was to validate the immunochromatographic test (ICT) Anigen Rapid Leishmania Ab Test kit for detection of L infantum antibodies in naturally exposed dogs in comparison with the immunofluorescence antibody test (IFAT). Serum samples from 66 dogs, including 20 healthy control dogs and 46 dogs suspected or confirmed with canine leishmaniosis, were measured by both tests. Anti-Leishmania IgG titers ≥ 1:40 by IFAT were considered positive. Kappa statistic with a 95% CI was calculated to evaluate agreement between the 2 testing methods, and sensitivity, specificity, and positive and negative likelihood ratio were calculated. Anti-L infantum IgG antibodies were found in 35 of 66 samples using the IFAT test (titers 1:40-1:5120). Thirty-one out of 66 samples tested positive with the qualitative ICT. Four IFAT-positive (titers ICT-negative. The Kappa value of 0.853 demonstrated very good agreement between the 2 tests. The Anigen Rapid Leishmania Ab Test kit reliably identified canine sera with anti-L infantum IgG antibody titers ≥ 1:40. The ICT requires neither special preparation of the serum nor specialized equipment and can be stored at ambient temperature. The test is applicable as a field test because it is easy to use and provides rapid results. © 2016 American Society for Veterinary Clinical Pathology.

  20. Elisa evaluation of the levels of antibodies against Infectious Bronchitis Virus in laying hens using egg yolk as substrate

    Directory of Open Access Journals (Sweden)

    RH Rauber

    2004-06-01

    Full Text Available The present work was carried out to compare Infectious Bronchitis Virus (IBV antibody titers in serum and egg yolk samples from laying hens. Sixty paired blood and egg samples were collected from laying hens of two farms. Serum samples were frozen, while egg yolk samples were diluted (1:500 before freezing. Serum and yolk samples were tested for the presence of IBV antibodies by indirect ELISA (commercial kit and titers were compared by a correlation test (alpha=0.05. There was a high correlation (r=0.62 between the two kinds of samples, which means that titers of IBV antibodies in the egg yolk and in serum samples are quite the same. Considering that blood collection causes deep stress that leads to economic losses, and since eggs are collected daily on the farm, results reported here are of importance to poultry production.

  1. Influence of long-term treatment with tetracycline and niacinamide on antibody production in dogs with discoid lupus erythematosus.

    Science.gov (United States)

    Mueller, Ralf S; Fieseler, Kathryn V; Bettenay, Sonya V; Rosychuk, Rodney A W

    2002-04-01

    To evaluate the effect of long-term treatment with tetracycline and niacinamide on antibody production in dogs by measuring postvaccinal serum concentrations of antibodies against canine parvovirus and canine distemper virus. 10 dogs receiving long-term treatment with tetracycline and niacinamide (treatment group) and 10 healthy dogs (control group). The treatment group included 9 dogs with discoid lupus erythematosus and 1 dog with pemphigus foliaceus on long-term treatment (> 12 months) with tetracycline and niacinamide. The control group included 10 healthy dogs with no clinical signs of disease and no administered medications for the past 3 months. Blood samples were obtained from all dogs by jugular venipuncture. Serum antibody titers against canine parvovirus and canine distemper virus antigens were measured, using hemaglutination inhibition and serum neutralization, respectively, and compared between groups. A significant difference in antibody titers between treatment- and control-group dogs was not found. All dogs had protective antibody titers against canine distemper virus, and 8 of 10 dogs from each group had protective titers against canine parvovirus infection. These results provide evidence that long-term treatment with tetracycline and niacinamide does not interfere with routine vaccinations and thus does not seem to influence antibody production in dogs.

  2. [Detection of serum Chlamydia pneumoniae antibodies and analysis of epidemiologic data in 5 years].

    Science.gov (United States)

    Cui, Jingtao; Yan, Wenjuan; Ni, Anping; Kong, Lingjun; Chen, Lanlan

    2014-04-01

    To detect serum Chlamydia pneumoniae (C.pneumonia) antibodies and analyze the epidemiologic data. Micro-immunofluorescence (MIF) was used to detect IgG and IgM antibodies against C.pneumoniae in 7 802 serum specimens from May 2008 to September 2013. C.pneumoniae past or recent infections were determined based on specific IgG and IgM antibodies and their titers. The analysis of relationship between age, gender and other clinical factors associated with antibody titers was performed. The positive rate of C.pneumonia IgG antibodies ( ≥ 1: 16 and pneumonia IgG antibodies was 43.9. GMT in males was significantly higher than that in females (45.8 vs 41.9, P = 0.000 1). And 282 (3.6%) patients were diagnosed with recent C.pneumoniae infection (IgG ≥ 1: 512 or IgM ≥ 1: 16 or acute and convalescent serum antibody titers turned to positive or four times and more elevated). The lowest rate of 0.5% (2/417) was detected in pneumoniae IgM antibody was used as an only criteria for C. pneumoniae recent infection. The recent infection rates in patients with autoimmune diseases (7.1% (24/336) ) and those with pneumonia/chest radiological shadow findings (4.7% (69/1 467)) were statistically higher than the average rate (3.6%) of total population (P = 0.000 4, 0.014 0). The positive rate of C.pneumonia IgG antibody is quite high in the population. And the GMT of C.pneumoniae IgG antibody in males is significantly high than that in females. Recent C.pneumonia infection is to be missed if IgM antibody is used as a sole criterion.

  3. Rapid detection of anti-Vaccinia virus neutralizing antibodies

    Directory of Open Access Journals (Sweden)

    Lichtfuss Gregor F

    2011-03-01

    Full Text Available Abstract Increasing infections with Monkeypox and Cowpox viruses pose a continuous and growing threat to human health. The standard method for detecting poxvirus neutralizing antibodies is the plaque-reduction neutralization test that is specific but also time-consuming and laborious. Therefore, a rapid and reliable method was developed to determine neutralizing antibody titers within twelve hours. The new assay measures viral mRNA transcription as a marker for actively replicating virus after incomplete neutralization using real-time PCR.

  4. Persistence of Leishmania donovani Antibodies in Past Visceral Leishmaniasis Cases in India ▿

    Science.gov (United States)

    Gidwani, Kamlesh; Picado, Albert; Ostyn, Bart; Singh, Shri Prakash; Kumar, Rajiv; Khanal, Basudha; Lejon, Veerle; Chappuis, François; Boelaert, Marleen; Sundar, Shyam

    2011-01-01

    The persistence of anti-Leishmania donovani antibodies in past visceral leishmaniasis (VL) cases was retrospectively assessed by means of the direct agglutination test (DAT) and the rK39 enzyme-linked immunosorbent assay (ELISA). Antibody titers remained high for an extended period of time in past cases of VL. These results highlight the need to carefully elicit the history of patients with VL symptoms. PMID:21159922

  5. Quantitative trait loci for body weight in layers differ from quantitative trait loci specific for antibody responses to sheep red blood cells

    NARCIS (Netherlands)

    Siwek, M.Z.; Cornelissen, S.J.B.; Buitenhuis, A.J.; Nieuwland, M.G.B.; Bovenhuis, H.; Crooijmans, R.P.M.A.; Groenen, M.A.M.; Parmentier, H.K.; Poel, van der J.J.

    2004-01-01

    Quantitative trait loci for BW at 4, 6, 8, 12, and 18 wk of age were detected in an experimental F2 cross of layers divergently selected for primary antibody response to SRBC. A negative phenotypic correlation between levels of antibody titers and BW, was reported earlier within founder lines. The

  6. Increased TRAb and/or low anti-TPO titers at diagnosis of graves' disease are associated with an increased risk of developing ophthalmopathy after onset.

    Science.gov (United States)

    Lantz, M; Planck, T; Asman, P; Hallengren, B

    2014-02-01

    Patients with low thyroid peroxidase antibodies (anti-TPO) and increased TSH-receptor antibodies (TRAb) at diagnosis of Graves' disease (GD) have been suggested to have an increased risk to develop Graves' ophthalmopathy (GO). The aim was to evaluate if GO development can be predicted.This is an observational study with registration of possible GD and GO risk factors.399 patients with GD were registered 2003-2008 in Malmö, Sweden and out of these 310 were retrospectively followed up to 6 years. The main outcome measures were anti-TPO titer, TRAb titer, smoking habits, radioiodine treatment and GO development.TRAb was assessed with a third generation assay at GD diagnosis in 231 patients. The proportion of patients with GO increased above the median 6.3 IU/L both at diagnosis of GD (p=0.001) and at follow-up (p=0.0001).The distribution of GO patients anti-TPO above or below 20 kIU/L at diagnosis of GD was similar between groups (p=0.239). However at follow-up anti-TPOTPO>20 kIU/L (p=0.018).87% of patients who developed GO after GD diagnosis had TRAb above 6.3 IU/L and/or anti-TPO below 20 kIU/L. The proportion of GO was doubled in GD patients treated with radioiodine but could not explain the described findingsAnti-TPO6.3 IE/L at the time of GD diagnosis were associated with an increased risk to develop GO after diagnosis of GD. © J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York.

  7. Antibody response in cattle after vaccination with inactivated and attenuated rabies vaccines

    Directory of Open Access Journals (Sweden)

    RODRIGUES da SILVA Andréa de Cássia

    2000-01-01

    Full Text Available Despite the absence of current official reports showing the number of cattle infected by rabies, it is estimated that nearly 30,000 bovines are lost each year in Brazil. In order to minimize the important economic losses, control of the disease is achieved by eliminating bat colonies and by herd vaccination. In this study, we compare the antibody response in cattle elicited by vaccination with an attenuated ERA vaccine (AEvac and an inactivated-adjuvanted PV (IPVvac vaccine. The antibody titers were appraised by cell-culture neutralization test and ELISA, and the percentage of seropositivity was ascertained for a period of 180 days. IPVvac elicited complete seropositivity rates from day 30 to day 150, and even on day 180, 87% of the sera showed virus-neutralizing antibody titers (VNA higher than 0.5IU/ml. There were no significant differences between the VNA titers and seropositivity rates obtained with IPVvac in the two methods tested. AEvac, however, elicited significantly lower titers than those observed in the group receiving inactivated vaccine. In addition, the profiles of antirabies IgG antibodies, evaluated by ELISA, and VNA, appraised by cell-culture neutralization test, were slightly different, when both vaccines were compared.

  8. Directional Selection for Specific Sheep Cell Antibody Responses Affects Natural Rabbit Agglutinins of Chickens

    NARCIS (Netherlands)

    Cotter, P.F.; Ayoub, J.; Parmentier, H.K.

    2005-01-01

    Agglutination data from generations 8 through 19 indicate that bidirectional selection for specific SRBC antibody responses was successful in a line cross of ISA × Warren medium heavy layers. After 11 generations titers of the high SRBC selected line (H line) were nearly 1:32,000; those of the low

  9. Serial Analysis of Antimitochondrial Antibody in Patients with Primary Biliary Cirrhosis

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    Gordon D. Benson

    2004-01-01

    Full Text Available Antimitochondrial antibodies (AMAs are the classic serologic marker in primary biliary cirrhosis (PBC. However, there have been only limited attempts to study changes in titer or isotype analysis of such AMAs in patients followed for long periods of time

  10. Clinical significance of antiphospholipid antibodies in Indian scleroderma patients.

    Science.gov (United States)

    Gupta, R; Thabah, M M; Gupta, S; Shankar, S; Kumar, A

    2009-12-01

    In patients with systemic sclerosis (SSc), antiphospholipid antibodies (aPL) have been reported to be associated with more severe manifestations including digital infarct, gangrene and pulmonary hypertension. But these findings are not consistent in all studies; moreover, there are no data available from Indian subcontinent. The objective of this study is to assess the prevalence of antiphospholipid antibodies in Indian SSc patients and correlate them with clinical and immunological features. Seventy-two patients were recruited prospectively from rheumatology clinic from 2002 to 2006. Their medical records were reviewed. Anticardiolipin antibodies (IgG, IgM) by ELISA and lupus anticoagulant (LA) were tested in standardized pattern and repeated after 6 weeks. Anti-β2 glycoprotein-I antibodies were done in patients who had aPL antibodies. Nineteen patients had diffuse cutaneous SSc and 53 had limited disease. Seven patients (9.7%) were positive for aPL antibodies in their sera. Only one patient had clinical features of antiphospholipid antibody syndrome and manifested with recurrent abortions and deep vein thrombosis. She was positive for aCL, LA and anti-β2 glycoprotein-I antibodies. Four patients were only aCL (IgG) positive in moderate titers and one each had only aCL (IgM) and LAC positivity. None of the clinical parameters showed an association with aPL antibody.

  11. Case study on human α1-antitrypsin: Recombinant protein titers obtained by commercial ELISA kits are inaccurate

    DEFF Research Database (Denmark)

    Hansen, Henning Gram; Kildegaard, Helene Faustrup; Min Lee, Gyun

    2016-01-01

    Accurate titer determination of recombinant proteins is crucial for evaluating protein production cell lines and processes. Even though enzyme-linked immunosorbent assay (ELISA) is the most widely used assay for determining protein titer, little is known about the accuracy of commercially availab...

  12. Neutralizing antibody response in the patients with hand, foot and mouth disease to enterovirus 71 and its clinical implications

    Directory of Open Access Journals (Sweden)

    Zhu Liye

    2011-06-01

    Full Text Available Abstract Enterovirus 71 (EV71 has emerged as a significant pathogen causing large outbreaks in China for the past 3 years. Developing an EV71 vaccine is urgently needed to stop the spread of the disease; however, the adaptive immune response of humans to EV71 infection remains unclear. We examined the neutralizing antibody titers in HFMD patients and compared them to those of asymptomatic healthy children and young adults. We found that 80% of HFMD patients became positive for neutralizing antibodies against EV71 (GMT = 24.3 one day after the onset of illness. The antibody titers in the patients peaked two days (GMT = 79.5 after the illness appeared and were comparable to the level of adults (GMT = 45.2. Noticeably, the antibody response was not correlated with disease severity, suggesting that cellular immune response, besides neutralizing antibodies, could play critical role in controlling the outcome of EV71 infection in humans.

  13. O perfil da antiestreptolisina O no diagnóstico da febre reumática aguda Antistreptolysin O titer profile in acute rheumatic fever diagnosis

    Directory of Open Access Journals (Sweden)

    Claudia Saad Magalhães Machado

    2001-04-01

    Full Text Available OBJETIVO: estabelecer o perfil dos títulos de ASO, mediante o diagnóstico diferencial da FRA com outras afecções que também cursam com níveis elevados de ASO. MÉTODOS: foram estudados 78 casos de FRA na apresentação e seguimento, 22 de coréia isolada, 45 de infecções orofaringeanas recorrentes (IOR e 23 de artrites idiopáticas juvenis (AIJ, com início ou reativação recente. A determinação seqüencial de ASO (UI/ml foi realizada por ensaio nefelométrico automatizado (Behring®-Germany nos períodos de 0-7 dias, 1-2 semanas, 2-4 semanas, 1-2 meses, 2-4 meses, 4-6 meses, 6-12 meses, 1-2 anos, 2-3 anos, 3-4 anos e 4-5 anos após o diagnóstico. RESULTADOS: os títulos de ASO na fase aguda da FRA apresentaram elevação significante até o intervalo de 2- 4 meses (p 960 UI/ml. CONCLUSÃO: esta reavaliação do perfil da ASO indicou uma resposta exuberante na fase aguda da febre reumática indicou ainda que os seus níveis séricos podem diferenciá-la de outras afecções que também cursam com níveis elevados de ASO, como as infecções orofaringeanas recorrentes ou as artrites idiopáticas juvenis em atividade.OBJECTIVE: to determine ASO titer profile by establishing ARF differential diagnoses of other diseases with high levels of ASO antibodies. METHODS: we investigated 78 patients with ARF at onset and follow-up, 22 with isolated chorea at onset, 45 with recurrent oropharyngeal tonsillitis, and 23 with recent flare of juvenile idiopathic arthritis. We tested ASO with automated particle-enhanced immunonephelometric assay (Behring®-Germany. The ASO (IU/ml titers were assessed at the following time intervals: 0-7 days, 1-2 weeks, 2-4 weeks, 1-2 months, 2-4 months, 4-6 months, 6-12 months, 1-2 years, 2-3 years, 3-4 years, and 4-5 years after onset of ARF. RESULTS: ASO titers in patients diagnosed with ARF had a significant increase up to the 2-4-month time interval (P < 0.0001. Baseline levels were observed afterwards in patients

  14. Antibody Engineering and Therapeutics

    Science.gov (United States)

    Almagro, Juan Carlos; Gilliland, Gary L; Breden, Felix; Scott, Jamie K; Sok, Devin; Pauthner, Matthias; Reichert, Janice M; Helguera, Gustavo; Andrabi, Raiees; Mabry, Robert; Bléry, Mathieu; Voss, James E; Laurén, Juha; Abuqayyas, Lubna; Barghorn, Stefan; Ben-Jacob, Eshel; Crowe, James E; Huston, James S; Johnston, Stephen Albert; Krauland, Eric; Lund-Johansen, Fridtjof; Marasco, Wayne A; Parren, Paul WHI; Xu, Kai Y

    2014-01-01

    The 24th Antibody Engineering & Therapeutics meeting brought together a broad range of participants who were updated on the latest advances in antibody research and development. Organized by IBC Life Sciences, the gathering is the annual meeting of The Antibody Society, which serves as the scientific sponsor. Preconference workshops on 3D modeling and delineation of clonal lineages were featured, and the conference included sessions on a wide variety of topics relevant to researchers, including systems biology; antibody deep sequencing and repertoires; the effects of antibody gene variation and usage on antibody response; directed evolution; knowledge-based design; antibodies in a complex environment; polyreactive antibodies and polyspecificity; the interface between antibody therapy and cellular immunity in cancer; antibodies in cardiometabolic medicine; antibody pharmacokinetics, distribution and off-target toxicity; optimizing antibody formats for immunotherapy; polyclonals, oligoclonals and bispecifics; antibody discovery platforms; and antibody-drug conjugates. PMID:24589717

  15. Human antibody repertoire after VSV-Ebola vaccination identifies novel targets and virus-neutralizing IgM antibodies.

    Science.gov (United States)

    Khurana, Surender; Fuentes, Sandra; Coyle, Elizabeth M; Ravichandran, Supriya; Davey, Richard T; Beigel, John H

    2016-12-01

    Development of an effective vaccine against Ebola virus is of high priority. However, knowledge about potential correlates of protection and the durability of immune response after vaccination is limited. Here, we elucidate the human antibody repertoire after administration of vesicular stomatitis virus (VSV)-Ebola vaccine at 3 million, 20 million and 100 million plaque-forming units (PFU) and homologous VSV-Ebola vaccine boost in healthy adult volunteers. Whole genome-fragment phage display libraries, expressing linear and conformational epitopes of Ebola glycoprotein (GP), showed higher diversity of antibody epitopes in individuals vaccinated with 20 million PFU than in those vaccinated with 3 million or 100 million PFU. Surface plasmon resonance kinetics showed higher levels of GP-binding antibodies after a single vaccination with 20 million or 100 million PFU than with 3 million PFU, and these correlated strongly with neutralization titers. A second vaccination did not boost antibody or virus neutralization titers, which declined rapidly, and induced only minimal antibody affinity maturation. Isotype analysis revealed a predominant IgM response even after the second vaccination, which contributed substantially to virus neutralization in vitro. These findings may help identify new vaccine targets and aid development and evaluation of effective countermeasures against Ebola.

  16. Anti-MOG antibody-positive ADEM following infectious mononucleosis due to a primary EBV infection: a case report.

    Science.gov (United States)

    Nakamura, Yoshitsugu; Nakajima, Hideto; Tani, Hiroki; Hosokawa, Takafumi; Ishida, Shimon; Kimura, Fumiharu; Kaneko, Kimihiko; Takahashi, Toshiyuki; Nakashima, Ichiro

    2017-04-19

    Anti-Myelin oligodendrocyte glycoprotein (MOG) antibodies are detected in various demyelinating diseases, such as pediatric acute disseminated encephalomyelitis (ADEM), recurrent optic neuritis, and aquaporin-4 antibody-seronegative neuromyelitis optica spectrum disorder. We present a patient who developed anti-MOG antibody-positive ADEM following infectious mononucleosis (IM) due to Epstein-Barr virus (EBV) infection. A 36-year-old healthy man developed paresthesia of bilateral lower extremities and urinary retention 8 days after the onset of IM due to primary EBV infection. The MRI revealed the lesions in the cervical spinal cord, the conus medullaris, and the internal capsule. An examination of the cerebrospinal fluid revealed pleocytosis. Cell-based immunoassays revealed positivity for anti-MOG antibody with a titer of 1:1024 and negativity for anti-aquaporin-4 antibody. His symptoms quickly improved after steroid pulse therapy followed by oral betamethasone. Anti-MOG antibody titer at the 6-month follow-up was negative. This case suggests that primary EBV infection would trigger anti-MOG antibody-positive ADEM. Adult ADEM patients can be positive for anti-MOG antibody, the titers of which correlate well with the neurological symptoms.

  17. Kinetic and HPV infection effects on cross-type neutralizing antibody and avidity responses induced by Cervarix®

    Science.gov (United States)

    Kemp, Troy J.; Safaeian, Mahboobeh; Hildesheim, Allan; Pan, Yuanji; Penrose, Kerri J.; Porras, Carolina; Schiller, John T.; Lowy, Douglas R.; Herrero, Rolando; Pinto, Ligia A.

    2012-01-01

    Background We previously demonstrated that Cervarix® elicits antibody responses against vaccine-related types for which clinical efficacy was demonstrated (HPV-31 and -45). Here, we evaluated the kinetics of neutralization titers and avidity of Cervarix®-induced antibodies up to 36 months of follow-up in unexposed and HPV infected women. Methods A subset of women who participated in the Cost Rica HPV-16/18 Vaccine Trial had pre- and post-vaccination sera tested for antibody responses to HPV-16, -18, -31, -45, and -58 using a pseudovirion-based neutralization assay, and HPV-16 antibody avidity using an HPV-16 L1 VLP (virus-like particle)-based ELISA developed in our laboratory. Results In uninfected women, neutralizing antibody titers did not reach significance until after the 3rd dose for HPV-31 (month 12, p=0.009) and HPV-45 (month 12, p=0.003), but then persisted up to month 36 (HPV-31, p=0.01; HPV-45, p=0.002). Individuals infected with HPV-16 or HPV-31 at enrollment developed a significantly higher median antibody response to the corresponding HPV type after one dose, but there was not a difference between median titers after three doses compared to the HPV negative group. Median HPV-16 antibody avidity and titer increased over time up to month 12; however, the HPV-16 avidity did not correlate well with HPV-16 neutralizing antibody titers at each time point examined, except for month 6. The median avidity levels were higher in HPV-16 infected women at month 1 (p=0.04) and lower in HPV-16 infected women at month 12 (p=0.006) compared to the HPV negative women. Conclusions The persistence of cross-neutralization titers at month 36 suggests cross-reactive antibody responses are likely to persist long-term and are not influenced by infection status at enrollment. However, the weak correlation between avidity and neutralization titers emphasizes the need for examining avidity in efficacy studies to determine if high avidity antibodies play a critical role in

  18. Kinetic and HPV infection effects on cross-type neutralizing antibody and avidity responses induced by Cervarix(®).

    Science.gov (United States)

    Kemp, Troy J; Safaeian, Mahboobeh; Hildesheim, Allan; Pan, Yuanji; Penrose, Kerri J; Porras, Carolina; Schiller, John T; Lowy, Douglas R; Herrero, Rolando; Pinto, Ligia A

    2012-12-17

    We previously demonstrated that Cervarix(®) elicits antibody responses against vaccine-related types for which clinical efficacy was demonstrated (HPV-31 and -45). Here, we evaluated the kinetics of neutralization titers and avidity of Cervarix(®)-induced antibodies up to 36 months of follow-up in unexposed and HPV infected women. A subset of women who participated in the Cost Rica HPV-16/18 Vaccine Trial had pre- and post-vaccination sera tested for antibody responses to HPV-16, -18, -31, -45, and -58 using a pseudovirion-based neutralization assay, and HPV-16 antibody avidity using an HPV-16 L1 VLP (virus-like particle)-based ELISA developed in our laboratory. In uninfected women, neutralizing antibody titers did not reach significance until after the 3rd dose for HPV-31 (month 12, p=0.009) and HPV-45 (month 12, p=0.003), but then persisted up to month 36 (HPV-31, p=0.01; HPV-45, p=0.002). Individuals infected with HPV-16 or HPV-31 at enrollment developed a significantly higher median antibody response to the corresponding HPV type after one dose, but there was not a difference between median titers after three doses compared to the HPV negative group. Median HPV-16 antibody avidity and titer increased over time up to month 12; however, the HPV-16 avidity did not correlate well with HPV-16 neutralizing antibody titers at each time point examined, except for month 6. The median avidity levels were higher in HPV-16 infected women at month 1 (p=0.04) and lower in HPV-16 infected women at month 12 (p=0.006) compared to the HPV negative women. The persistence of cross-neutralization titers at month 36 suggests cross-reactive antibody responses are likely to persist long-term and are not influenced by infection status at enrollment. However, the weak correlation between avidity and neutralization titers emphasizes the need for examining avidity in efficacy studies to determine if high avidity antibodies play a critical role in protection against infection. Copyright

  19. Effects of the manufacturing process on the anti-A isoagglutinin titers in intravenous immunoglobulin products.

    Science.gov (United States)

    Romberg, Val; Hoefferer, Liane; El Menyawi, Ibrahim

    2015-07-01

    The first intravenous immunoglobulin G (IVIG) preparations for clinical use were produced from human plasma by Cohn-like fractionation processes. To achieve higher purity and yield, chromatography-based processes were developed. Using two products as examples, we compare the capacity of these two manufacturing processes to reduce the levels of anti-A and anti-B isoagglutinins in IVIG, which are believed to be responsible for rare hemolytic adverse events. The isoagglutinin levels of Sandoglobulin (lyophilized, sucrose-stabilized IVIG produced by Cohn-like fractionation) and Privigen (10% l-proline-stabilized IVIG produced by a chromatography-based process) were measured by the indirect agglutination test (IAT). The intrinsic isoagglutinin reduction capacity of each fractionation step was assessed in laboratory- and industry-scale experiments using the IAT and a flow cytometry-based immunoglobulin-binding assay, respectively. The median anti-A isoagglutinin titer recorded in 248 Sandoglobulin lots was three titer steps lower than the one measured in 651 Privigen lots (1:2 vs. 1:16). Over the entire process, we measured a five-titer-step isoagglutinin reduction in laboratory-scale Cohn-like fractionation; the largest reduction was observed between Fraction (F)II+III and FII. An overall four-titer-step reduction was recorded in the industry-scale process. In contrast, none of the steps of the chromatography-based manufacturing process caused any decrease in anti-A isoagglutinin content. Similar results were obtained for anti-B isoagglutinin reduction. Unlike Cohn-like fractionation, chromatography-based IVIG manufacturing processes do not have an intrinsic capacity for isoagglutinin reduction. The addition of dedicated isoagglutinin reduction steps may help minimize the potential risk of hemolysis in IVIG-treated patients. © 2015 AABB.

  20. Correlation between hepatitis B surface antigen titers and HBV DNA levels.

    Science.gov (United States)

    Alghamdi, Amal; Aref, Nagwa; El-Hazmi, Malak; Al-Hamoudi, Waleed; Alswat, Khalid; Helmy, Ahmed; Sanai, Faisal M; Abdo, Ayman A

    2013-01-01

    To assess the correlation between serum HBsAg titers and hepatitis B virus (HBV) DNA levels in patients with hepatitis B envelop antigen-negative (HBeAg -ve) HBV genotype-D (HBV/D) infection. A total of 106 treatment- naïve, HBeAg -ve HBV/D patients were included; 78 in the inactive carrier (IC) state and 28 in the active hepatitis (AH) stage. HBV DNA load and HBsAg titers were tested using TaqMan real-time polymerase chain reaction (PCR) and automated chemiluminescent microparticle immunoassay, respectively. The median (range) log10 HBsAg titer was significantly lower in the IC group compared with AH group, 3.09 (-1 to -4.4) versus 3.68 (-0.77 to 5.09) IU/mL, respectively; P correlation between HBsAg and HBV DNA levels in the whole cohort, AH, and IC groups (r = 0.6, P correlate with HBV DNA in treatment-naïve HBeAg -ve HBV/D patients, and supports the use of HBsAg levels in clinical practice as a predictor of serum HBV DNA levels.

  1. Ovaries and regulation of juvenile hormone titer in Acheta domesticus L. (Orthoptera).

    Science.gov (United States)

    Renucci, M; Strambi, C; Strambi, A; Augier, R; Charpin, P

    1990-04-01

    A study was performed on females Acheta domesticus to examine the effects of various experimental conditions on the ovarian physiology. Using a radioimmunoassay to determine juvenile hormone (JH) titers as well as in vitro JH biosynthesis, we observed that retention of mature follicles in egg-retaining females, i.e., virgins or mated females not provided an egg-laying substrate, inhibits JH production and consequently oocyte development. Mating in intact as well as ovariectomized females does not affect corpora allata activity. It is only when mating is associated with egg laying that JH biosynthesis and hemolymph titers increased and oocyte development and fecundity are stimulated. Despite lower JH biosynthesis, ovariectomized females present enlarged corpora allata and the levels of JH observed in their hemolymph were intermediate between those of intact egg-laying and virgin females. In intact females, the hemolymph JH titers as well as the JH esterase activities were related to ovarian development. JH esterase activity was very high in ovariectomized animals. Several factors involved in ovarian development of A. domesticus are discussed.

  2. Vaccine induced antibodies to the first variable loop of human immunodeficiency virus type 1 gp120, mediate antibody-dependent virus inhibition in macaques.

    Science.gov (United States)

    Bialuk, Izabela; Whitney, Stephen; Andresen, Vibeke; Florese, Ruth H; Nacsa, Janos; Cecchinato, Valentina; Valeri, Valerio W; Heraud, Jean-Michel; Gordon, Shari; Parks, Robyn Washington; Montefiori, David C; Venzon, David; Demberg, Thorsten; Guroff, Marjorie Robert-; Landucci, Gary; Forthal, Donald N; Franchini, Genoveffa

    2011-12-09

    The role of antibodies directed against the hyper variable envelope region V1 of human immunodeficiency virus type 1 (HIV-1), has not been thoroughly studied. We show that a vaccine able to elicit strain-specific non-neutralizing antibodies to this region of gp120 is associated with control of highly pathogenic chimeric SHIV(89.6P) replication in rhesus macaques. The vaccinated animal that had the highest titers of antibodies to the amino terminus portion of V1, prior to challenge, had secondary antibody responses that mediated cell killing by antibody-dependent cellular cytotoxicity (ADCC), as early as 2 weeks after infection and inhibited viral replication by antibody-dependent cell-mediated virus inhibition (ADCVI), by 4 weeks after infection. There was a significant inverse correlation between virus level and binding antibody titers to the envelope protein, (R=-0.83, p=0.015), and ADCVI (R=-0.84 p=0.044). Genotyping of plasma virus demonstrated in vivo selection of three SHIV(89.6P) variants with changes in potential N-linked glycosylation sites in V1. We found a significant inverse correlation between virus levels and titers of antibodies that mediated ADCVI against all the identified V1 virus variants. A significant inverse correlation was also found between neutralizing antibody titers to SHIV(89.6) and virus levels (R=-0.72 p=0.0050). However, passive inoculation of purified immunoglobulin from animal M316, the macaque that best controlled virus, to a naïve macaque, resulted in a low serum neutralizing antibodies and low ADCVI activity that failed to protect from SHIV(89.6P) challenge. Collectively, while our data suggest that anti-envelope antibodies with neutralizing and non-neutralizing Fc(R-dependent activities may be important in the control of SHIV replication, they also demonstrate that low levels of these antibodies alone are not sufficient to protect from infection. Published by Elsevier Ltd.

  3. Effect of oral administration of Propionibacterium acnes on growth performance, DTH response and anti-OVA titers in goat kids

    Directory of Open Access Journals (Sweden)

    Luis Miguel Ferrer

    2013-01-01

    Full Text Available Immunostimulants are susbstances that stimuli the response of effector cells to activate the immune response such as antigen uptake, cytokine release or antibody response. These substances can increase resistence to infection by different types of microorganisms, reducing dependence of antibiotics used in livestock animals. Recent reports have demonstrated the positive effect of Propionibacterium acnes (P. acnes to control animal diseases. In this study, we evaluated the effect of the non-specific immunostimulant P. acnes on immunological functions and growth performance in goat kids. Twenty five goat kids served as control group (A and another 25 animals received P. acnes being the experimental group (B. Kids were challenged with ovalbumin (OVA to assess humoral immunity. To assess in vivo cell immunity, delayed type hypersensitivity (DTH test with phytohemagglutinin (PHA was used, clinical signs and body weight were recorded each week until 9 weeks of age when the experiment ended. Blood samples were obtained to analyze serum proteins fractions and anti-OVA specific antibodies. No clinical signs of disease and no differences (p>0.05 on body weight between groups were recorded (7.32±0.81 kg in group A, 7.13±0.65 kg in group B. Goat kids from group B had more total protein (59.8±5g/l and albumin levels (32.8±3.3g/l than goat kids from group A (56.6±5.7 g/l, 29.6±3.9 g/l respectively (p<0.05. DTH response in goat kids from group B on day 42 was higher (p<0.05 than group A. At day 63, goat kids from group receiving P. acnes had higher percentage (85.4 of anti-OVA IgM titers (p<0.05 than control group (57.7. In conclusion, the results showed that oral administration of P. acnes to goat kids improved some aspects of the immune system of the animals and it could be used to control goat diseases.

  4. Evaluation and comparison of an indirect fluorescent antibody test for detection of antibodies to Sarcocystis neurona, using serum and cerebrospinal fluid of naturally and experimentally infected, and vaccinated horses.

    Science.gov (United States)

    Duarte, Paulo C; Daft, Barbara M; Conrad, Patricia A; Packham, Andrea E; Saville, William J; MacKay, Robert J; Barr, Bradd C; Wilson, W David; Ng, Terry; Reed, Stephen M; Gardner, Ian A

    2004-04-01

    The objectives of this study were to evaluate the accuracy of the indirect fluorescent antibody test (IFAT) using serum and cerebrospinal fluid (CSF) of horses naturally and experimentally infected with Sarcocystis neurona, to assess the correlation between serum and CSF titers, and to determine the effect of S. neurona vaccination on the diagnosis of infection. Using receiver-operating characteristic analysis, the areas under the curve for the IFAT were 0.97 (serum) and 0.99 (CSF). Sensitivity and specificity were 83.3 and 96.9% (serum, cutoff 80) and 100 and 99% (CSF, cutoff 5), respectively. Titer-specific likelihood ratios (LRs) ranged from 0.03 to 187.8 for titers between <10 and 640. Median time to conversion was 22-26 days postinfection (DPI) (serum) and 30 DPI (CSF). The correlation between serum and CSF titers was moderately strong (r = 0.6) at 30 DPI. Percentage of vaccinated antibody-positive horses ranged from 0 to 95% between 0 and 112 days after the second vaccination. Thus, the IFAT was reliable and accurate using serum and CSF. Use of LRs potentially improves clinical decision making. Correlation between serum and CSF titers affects the joint accuracy of the IFAT; therefore, the ratio of serum to CSF titers has potential diagnostic value. The S. neurona vaccine could possibly interfere with equine protozoal myeloencephalitis diagnosis.

  5. Anti-peptide antibodies differentiate between plasmodial lactate dehydrogenases.

    Science.gov (United States)

    Hurdayal, Ramona; Achilonu, Ikechukwu; Choveaux, David; Coetzer, Theresa H T; Dean Goldring, J P

    2010-04-01

    Malaria lactate dehydrogenase, a glycolytic enzyme, is a malaria diagnostic target in lateral flow immunochromatographic rapid diagnostic tests. Recombinant Plasmodium yoelii LDH was cloned into the pET-28a vector, expressed and the expressed protein purified from a Ni-NTA affinity matrix. A pan-malarial LDH antibody directed against a common malaria LDH peptide (APGKSDKEWNRDDLL) and two anti-peptide antibodies, each targeting a unique Plasmodium falciparum (LISDAELEAIFDC) and Plasmodium vivax (KITDEEVEGIFDC) LDH peptide were raised in chickens. The antibodies were affinity purified with the appropriate peptide affinity matrix. The affinity purified anti-peptide antibodies detected recombinant P. falciparum, P. vivax and P. yoelii LDH and native P. falciparum and P. yoelii LDH in western blots and immunofluorescence studies. The pan-malarial antibody detected LDH from the three malaria species in western blots. The species-specific anti-peptide antibodies differentiated between P. falciparum and P. vivax LDH. Affinity purified chicken antibodies against recombinant PfLDH, PvLDH and PyLDH proteins each detected the parent and orthologous proteins with similar titers in an ELISA. The study supports an anti-peptide antibody approach to the development of diagnostic reagents. Copyright (c) 2010 Elsevier Inc. All rights reserved.

  6. Design of a titering assay for lentiviral vectors utilizing direct extraction of DNA from transduced cells in microtiter plates

    Directory of Open Access Journals (Sweden)

    Michele E Murphy

    2016-01-01

    Full Text Available Using lentiviral vector products in clinical applications requires an accurate method for measuring transduction titer. For vectors lacking a marker gene, quantitative polymerase chain reaction is used to evaluate the number of vector DNA copies in transduced target cells, from which a transduction titer is calculated. Immune Design previously described an integration-deficient lentiviral vector pseudotyped with a modified Sindbis virus envelope for use in cancer immunotherapy (VP02, of the ZVex platform. Standard protocols for titering integration-competent lentiviral vectors employ commercial spin columns to purify vector DNA from transduced cells, but such columns are not optimized for isolation of extrachromosomal (nonintegrated DNA. Here, we describe a 96-well transduction titer assay in which DNA extraction is performed in situ in the transduction plate, yielding quantitative recovery of extrachromosomal DNA. Vector titers measured by this method were higher than when commercial spin columns were used for DNA isolation. Evaluation of the method's specificity, linear range, and precision demonstrate that it is suitable for use as a lot release assay to support clinical trials with VP02. Finally, the method is compatible with titering both integrating and nonintegrating lentiviral vectors, suggesting that it may be used to evaluate the transduction titer for any lentiviral vector.

  7. Prevalence of Neospora caninum and Toxoplasma gondii antibodies in coyotes (Canis latrans) and experimental infections of coyotes with Neospora caninum.

    Science.gov (United States)

    Lindsay, D S; Kelly, E J; McKown, R D; Stein, F J; Plozer, J; Herman, J; Blagburn, B L; Dubey, J P

    1996-08-01

    Antibodies to Neospora caninum were detected in 5 (10%) of 52 coyotes from Texas. Antibodies to Toxoplasma gondii were detected in 32 (62%) of 52 samples from these same coyotes. Four (80%) of the 5 coyotes that were seropositive for N. caninum also had antibodies to T. gondii. Nineteen (37%) of the coyotes did not have antibodies to either parasite. Three coyote pups were inoculated with the brains from mice infected with 3 strains of N. caninum originally isolated from dogs. None of the pups developed neosporosis or excreted N. caninum oocysts in their feces. The pups developed anti-N. caninum antibody titers of > or = 1:800 but did not develop antibodies to T. gondii. Results of this study indicate that antibodies to T. gondii are more common than antibodies to N. caninum in coyotes. Additionally, young coyotes appear to be resistant to experimental N. caninum infection.

  8. RBC Antibody Screen

    Science.gov (United States)

    ... products and services. Advertising & Sponsorship: Policy | Opportunities RBC Antibody Screen Share this page: Was this page helpful? ... Indirect Coombs Test; Indirect Anti-human Globulin Test; Antibody Screen Formal name: Red Blood Cell Antibody Screen ...

  9. WEST NILE VIRUS ANTIBODY DECAY RATE IN FREE-RANGING BIRDS.

    Science.gov (United States)

    McKee, Eileen M; Walker, Edward D; Anderson, Tavis K; Kitron, Uriel D; Brawn, Jeffrey D; Krebs, Bethany L; Newman, Christina; Ruiz, Marilyn O; Levine, Rebecca S; Carrington, Mary E; McLean, Robert G; Goldberg, Tony L; Hamer, Gabriel L

    2015-07-01

    Antibody duration, following a humoral immune response to West Nile virus (WNV) infection, is poorly understood in free-ranging avian hosts. Quantifying antibody decay rate is important for interpreting serologic results and for understanding the potential for birds to serorevert and become susceptible again. We sampled free-ranging birds in Chicago, Illinois, US, from 2005 to 2011 and Atlanta, Georgia, US, from 2010 to 2012 to examine the dynamics of antibody decay following natural WNV infection. Using serial dilutions in a blocking enzyme-linked immunosorbent assay, we quantified WNV antibody titer in repeated blood samples from individual birds over time. We quantified a rate of antibody decay for 23 Northern Cardinals (Cardinalis cardinalis) of 0.198 natural log units per month and 24 individuals of other bird species of 0.178 natural log units per month. Our results suggest that juveniles had a higher rate of antibody decay than adults, which is consistent with nonlinear antibody decay at different times postexposure. Overall, most birds had undetectable titers 2 yr postexposure. Nonuniform WNV antibody decay rates in free-ranging birds underscore the need for cautious interpretation of avian serology results in the context of arbovirus surveillance and epidemiology.

  10. Selection pressure from neutralizing antibodies drives sequence evolution during acute infection with hepatitis C virus.

    Science.gov (United States)

    Dowd, Kimberly A; Netski, Dale M; Wang, Xiao-Hong; Cox, Andrea L; Ray, Stuart C

    2009-06-01

    Despite recent characterization of hepatitis C virus-specific neutralizing antibodies, it is not clear to what extent immune pressure from neutralizing antibodies drives viral sequence evolution in vivo. This lack of understanding is particularly evident in acute infection, the phase when elimination or persistence of viral replication is determined and during which the importance of the humoral immune response has been largely discounted. We analyzed envelope glycoprotein sequence evolution and neutralization of sequential autologous hepatitis C virus pseudoparticles in 8 individuals throughout acute infection. Amino acid substitutions occurred throughout the envelope genes, primarily within the hypervariable region 1 of E2. When individualized pseudoparticles expressing sequential envelope sequences were used to measure neutralization by autologous sera, antibodies neutralizing earlier sequence variants were detected at earlier time points than antibodies neutralizing later variants, indicating clearance and evolution of viral variants in response to pressure from neutralizing antibodies. To demonstrate the effects of amino acid substitution on neutralization, site-directed mutagenesis of a pseudoparticle envelope sequence revealed amino acid substitutions in hypervariable region 1 that were responsible for a dramatic decrease in neutralization sensitivity over time. In addition, high-titer neutralizing antibodies peaked at the time of viral clearance in all spontaneous resolvers, whereas chronically evolving subjects displayed low-titer or absent neutralizing antibodies throughout early acute infection. These findings indicate that, during acute hepatitis C virus infection in vivo, virus-specific neutralizing antibodies drive sequence evolution and, in some individuals, play a role in determining the outcome of infection.

  11. Anti-bovine herpesvirus and anti-bovine viral diarrhea virus antibody responses in pregnant Holstein dairy cattle following administration of a multivalent killed virus vaccine.

    Science.gov (United States)

    Smith, Billy I; Rieger, Randall H; Dickens, Charlene M; Schultz, Ronald D; Aceto, Helen

    2015-10-01

    To determine the effect of a commercially available multivalent killed virus vaccine on serum neutralizing (SN) and colostrum neutralizing (CN) antibodies against bovine herpesvirus (BHV) type 1 and bovine viral diarrhea virus (BVDV) types 1 and 2 in pregnant dairy cattle. 49 Holstein dairy cattle. PROCEDURES :25 cattle were vaccinated (IM injection) at least 60 days prior to calving (ie, at the end of the lactation period or according to the expected calving date for heifers) and again 5 weeks later. The remaining 24 cattle were not vaccinated (control group). Titers of SN antibodies were measured at the 5-week time point. Titers of SN and CN antibodies were measured at parturition. 5 weeks after initial vaccination, titers of SN antibodies against BHV-1 and BVDV types 1 and 2 were 1:512, 1:128, and 1:2,048, respectively, in vaccinates and 1:64, 1:128, and 1:64, respectively, in unvaccinated controls. Equivalent SN antibody titers at parturition were 1:256, 1:64, and 1:512, respectively, in vaccinates and 1:128, 1:128, and 1:64, respectively, in controls. Median titers of CN antibodies against BHV-1 and BVDV types 1 and 2 were 1:1,280, 1:10,240, and 1:20,480, respectively, in vaccinates and 1:80, 1:1,280, and 1:2,560, respectively, in controls. Titers of antibodies against viral respiratory pathogens were significantly enhanced in both serum (BHV-1 and BVDV type 2) and colostrum (BHV-1 and BVDV types 1 and 2) in cattle receiving a killed virus vaccine (with no adverse reactions) before parturition. To maximize protection of bovine neonates, this method of vaccination should be considered.

  12. 18F-FDG PET/CT findings preceded elevation of serum proteinase 3 antineutrophil cytoplasmic antibodies in Wegener granulomatosis.

    Science.gov (United States)

    Ito, Kimiteru; Minamimoto, Ryogo; Yamashita, Hiroyuki; Morooka, Miyako; Okasaki, Momoko; Mimori, Akio; Kubota, Kazuo

    2014-01-01

    A 67-year-old woman underwent F-FDG PET/CT after developing a fever of unknown origin. PET/CT revealed intensive FDG uptake at the nasal and lung lesions. On the laboratory data, serum myeloperoxidase antineutrophil cytoplasmic antibodies (ANCA) titer was elevated, although serum directed against proteinase 3 (PR3) ANCA titer was within normal limits. One month after treatment, follow-up PET/CT revealed decreased FDG uptake at the lesions. One year later, serum PR3-ANCA titer elevated, which finally led to a diagnosis of Wegener granulomatosis (WG). WG lesions may be detected earlier by FDG PET/CT than by serum PR3-ANCA titers.

  13. Clinical utility of seropositive voltage-gated potassium channel–complex antibody

    Science.gov (United States)

    Jammoul, Adham; Shayya, Luay; Mente, Karin; Li, Jianbo; Rae-Grant, Alexander

    2016-01-01

    Abstract Background: Antibodies against voltage-gated potassium channel (VGKC)–complex are implicated in the pathogenesis of acquired neuromyotonia, limbic encephalitis, faciobrachial dystonic seizure, and Morvan syndrome. Outside these entities, the clinical value of VGKC-complex antibodies remains unclear. Methods: We conducted a single-center review of patients positive for VGKC-complex antibodies over an 8-year period. Results: Among 114 patients positive for VGKC-complex antibody, 11 (9.6%) carrying the diagnosis of limbic encephalitis (n = 9) or neuromyotonia (n = 2) constituted the classic group, and the remaining 103 cases of various neurologic and non-neurologic disorders comprised the nonclassic group. The median titer for the classic group was higher than the nonclassic group (p 0.25 nM) VGKC-complex antibody levels (p < 0.0001). A total of 75.0% of the patients in the high-level group had definite or probable autoimmune basis, while nonautoimmune disorders were seen in 75.6% of patients from the low-level group (p < 0.0001). A total of 26.3% of patients were found with active or remote solid organ or hematologic malignancy, but no antibody titer difference was observed among subgroups of absent, active, or remote malignancy. Compared to age-matched US national census, rates of active cancer in our cohort were higher in patients older than 45 years. Conclusions: High VGKC-complex antibody titers are more likely found in patients with classically associated syndromes and other autoimmune conditions. Low-level VGKC-complex antibodies can be detected in nonspecific and mostly nonautoimmune disorders. The presence of VGKC-complex antibody, rather than its level, may serve as a marker of malignancy. PMID:27847683

  14. Higher Throughput Quantification of Neutralizing Antibody to Herpes Simplex Viruses.

    Directory of Open Access Journals (Sweden)

    Tamara P Blevins

    Full Text Available We report a rapid, higher throughput method for measuring neutralizing antibody to herpes simplex virus (HSV in human sera. Clinical isolates and sera from the Herpevac Trial for Women were used in a colorimetric assay in which infection of tissue culture (lack of neutralization was indicated by substrate metabolism by beta-galactosidase induced in the ELVIS cell line. The neutralization assay was optimized by addition of guinea pig complement, which particularly enhanced neutralizing antibody titers to HSV-2. Higher neutralizing antibody titers were also achieved using virus particles isolated from the supernatant of infected cells rather than lysate of infected cells as the source of virus. The effect of assay incubation time and incubation time with substrate were also optimized. We found that incubating with substrate until a standard optical density of 1.0 was reached permitted a better comparison among virus isolates, and achieved reliable measurement of neutralizing antibody activity. Interestingly, in contrast to results in the absence of complement, addition of complement allowed sera from HSV-2 gD-vaccinated subjects to neutralize HSV-1 and HSV-2 clinical and laboratory isolates with equal potency.

  15. Production and purification of polyclonal antibody against melatonin hormone

    Directory of Open Access Journals (Sweden)

    Fooladsaz K

    1999-09-01

    Full Text Available Nowadays immunochemical techniques have played a very important and valuable role in quantitative and qualitative assays of liquid compounds of the body. Producing antibody against immunogenes is the first step to make immunochemical kits. In this study production and purification of polyclonal antibody against melatonin has been considered. This hormone which has several important functions in physiological conditions such as migraine, cirrhosis, mammary gland cancer and other diseases, is the most important pineal gland secretion. This gland is a circumventricular organ of brain and according to histological and anatomical studies, it is a high secretory organ, that secretes active biological substances like melatonin, oxytocin, serotonin and ect. In this study, melatonin has been considered as hapten and has become an immunogen by being linked to the bovine serum Albumin. Then, by the immunization of three white New Zeland rabbits that had the booster injections in regular intervals, the antibody titer was detected to be 1/2000, by using checkboard curves, and with the use of melatonin linked to penicillinase as a labeled antigen, the titer was detected 1/200. Finally an antibody with high purification rate has been obtained, which can be used in immunochemical assays like RIA, ELISA, and EIA.

  16. Prediction and Reduction of the Aggregation of Monoclonal Antibodies.

    Science.gov (United States)

    van der Kant, Rob; Karow-Zwick, Anne R; Van Durme, Joost; Blech, Michaela; Gallardo, Rodrigo; Seeliger, Daniel; Aßfalg, Kerstin; Baatsen, Pieter; Compernolle, Griet; Gils, Ann; Studts, Joey M; Schulz, Patrick; Garidel, Patrick; Schymkowitz, Joost; Rousseau, Frederic

    2017-04-21

    Protein aggregation remains a major area of focus in the production of monoclonal antibodies. Improving the intrinsic properties of antibodies can improve manufacturability, attrition rates, safety, formulation, titers, immunogenicity, and solubility. Here, we explore the potential of predicting and reducing the aggregation propensity of monoclonal antibodies, based on the identification of aggregation-prone regions and their contribution to the thermodynamic stability of the protein. Although aggregation-prone regions are thought to occur in the antigen binding region to drive hydrophobic binding with antigen, we were able to rationally design variants that display a marked decrease in aggregation propensity while retaining antigen binding through the introduction of artificial aggregation gatekeeper residues. The reduction in aggregation propensity was accompanied by an increase in expression titer, showing that reducing protein aggregation is beneficial throughout the development process. The data presented show that this approach can significantly reduce liabilities in novel therapeutic antibodies and proteins, leading to a more efficient path to clinical studies. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  17. Prevalence of antibodies to Toxoplasma gondii in females buffaloes in Ninavah province, Iraq

    Directory of Open Access Journals (Sweden)

    O. M. Al-Iraqi

    2008-01-01

    Full Text Available The aim of this study was to investigate the prevalence of antibodies to Toxoplasma gondii in the females of the local breed buffaloes. A 400 sera samples were collected from 49 herds from different nine geographical area in Ninavah province by using latex agglutination and modified latex agglutination tests. The results shows that the total prevalence rate of the antibodies was 30%, and this percentage was differ according to the region. The highest percentage appeared in Badosh and Qnetra at 52.3%, 51.2% respectively, while the lowest was in Hawiaslan 4.3%. The antibodies titer most appear was 80 in percentage 30.5%, while the titer 640 was lowest in percentage 1.7%. Also recorded that numbers of the active cases was highest in percentage 81.4% compared with inactive cases was lowest in percentage 18.6%, also noted that the seropositive samples decreased with age.

  18. Neutralizing antibodies to non-polio enteroviruses in human immune serum globulin.

    Science.gov (United States)

    Dagan, R; Prather, S L; Powell, K R; Menegus, M A

    1983-01-01

    Neutralizing antibodies to selected non-polio enteroviruses were found in three lots of human immune serum globulin (ISG) prepared from the sera of persons from different geographic regions. Reciprocal titers to coxsackieviruses B3 and B4 ranged from 400 to greater than or equal to 2000, whereas titers to coxsackievirus A9 and ECHO viruses 5 and 9 ranged from 100 to 400 in all three lots of ISG. The presence of neutralizing antibodies to commonly occurring (coxsackieviruses B1 to B5 and A9 and ECHO viruses 3, 4 and 9) and infrequently encountered (ECHO viruses 5 and 13) serotypes, coupled with the increasing evidence that antibodies are an important factor in preventing illness, support recommending the administration of ISG to those at high risk for serious disease.

  19. THE PERSISTENCE OF LEPTOSPIRAL AGGLUTININS TITERS IN HUMAN SERA DIAGNOSED BY THE MICROSCOPIC AGGLUTINATION TEST

    Directory of Open Access Journals (Sweden)

    Eliete C. ROMERO

    1998-05-01

    Full Text Available The persistence of agglutinins detected by MAT has created some problems to the interpretation of the results. The aim of this study was to examine the data of serology from 70 patients with serologically confirmed diagnosis of leptospirosis by during 3-13 months after being affected with leptospires in order to elucidate the interpretation of the persistence of agglutinins detected by MAT. Sixty-one patients sera (87.14% had titers equal or greater than 800. Of these, two individuals maintained titers of 800 thirteen months after the onset. This study showed that only one sample of sera with high titers is not reliable to determine the time at which infection occurred.Persistência de títulos de aglutininas anti-leptospiras em soros humanos diagnosticados pelo teste de aglutinação microscópica A persistência de aglutininas detectadas por MAT tem criado problemas na interpretação dos resultados. O objetivo deste trabalho foi examinar os resultados da sorologia de 70 pacientes com confirmação sorológica de leptospirose durante 3-13 meses após terem sido infectados para se poder elucidar a interpretação da persistência de aglutininas detectadas por MAT. Sessenta e um soros de pacientes (87,14% apresentaram títulos iguais, ou maiores, que 800. Destes, 2 indivíduos mantiveram títulos de 800 treze meses após terem sido infectados. Este estudo mostra que apenas uma amostra de soro, mesmo com alto título de aglutininas, não pode ser considerada para determinar a fase da doença.

  20. Aqueous Extracts of Hibiscus sabdariffa Calyces Decrease Hepatitis A Virus and Human Norovirus Surrogate Titers.

    Science.gov (United States)

    Joshi, Snehal S; Dice, Lezlee; D'Souza, Doris H

    2015-12-01

    Hibiscus sabdariffa extract is known to have antioxidant, anti-diabetic, and antimicrobial properties. However, their effects against foodborne viruses are currently unknown. The objective of this study was to determine the antiviral effects of aqueous extracts of H. sabdariffa against human norovirus surrogates (feline calicivirus (FCV-F9) and murine norovirus (MNV-1)) and hepatitis A virus (HAV) at 37 °C over 24 h. Individual viruses (~5 log PFU/ml) were incubated with 40 or 100 mg/ml of aqueous hibiscus extract (HE; pH 3.6), protocatechuic acid (PCA; 3 or 6 mg/ml, pH 3.6), ferulic acid (FA; 0.5 or 1 mg/ml; pH 4.0), malic acid (10 mM; pH 3.0), or phosphate buffered saline (pH 7.2 as control) at 37 °C over 24 h. Each treatment was replicated thrice and plaque assayed in duplicate. FCV-F9 titers were reduced to undetectable levels after 15 min with both 40 and 100 mg/ml HE. MNV-1 was reduced by 1.77 ± 0.10 and 1.88 ± 0.12 log PFU/ml after 6 h with 40 and 100 mg/ml HE, respectively, and to undetectable levels after 24 h by both concentrations. HAV was reduced to undetectable levels by both HE concentrations after 24 h. PCA at 3 mg/ml reduced FCV-F9 titers to undetectable levels after 6 h, MNV-1 by 0.53 ± 0.01 log PFU/ml after 6 h, and caused no significant change in HAV titers. FA reduced FCV-F9 to undetectable levels after 3 h and MNV-1 and HAV after 24 h. Transmission electron microscopy showed no conclusive results. The findings suggest that H. sabdariffa extracts have potential to prevent foodborne viral transmission.

  1. A surge in anti-dsDNA titer predicts a severe lupus flare within six months.

    Science.gov (United States)

    Pan, N; Amigues, I; Lyman, S; Duculan, R; Aziz, F; Crow, M K; Kirou, K A

    2014-03-01

    Rising anti-double-stranded (ds) DNA titers have been shown by some, but not all, studies to be predictive of disease flares in systemic lupus erythematosus (SLE). We hypothesized that a rapid and substantial rise in anti-dsDNA titer (anti-dsDNA surge) would be a good predictor of a clinically important SLE flare. A matched case-control study was conducted in an academic rheumatology practice setting. Our primary endpoint was the occurrence of a severe SELENA-SLEDAI (SS) flare within six months of an anti-dsDNA surge, and secondary endpoints were mild/moderate SS flares, as well as BILAG A and B renal flares. Cases were identified as those patients whose disease course included a surge of anti-dsDNA, defined as an increase of anti-dsDNA titer by the Crithidia luciliae immunofluorescence (CLIF) assay from 0 to 3+/4+, or from 1+ to 4+, within a period of less than 12 months. The date of the anti-dsDNA surge was defined as Day 0. Two control SLE patients were identified for each case and were matched for age, sex, race, and visit date closest to case Day 0, but without an anti-dsDNA surge. Logistic regression models were used to detect associations between anti-dsDNA surges and severe SS flares. A higher proportion of cases, compared to controls, experienced a severe SS flare within six months of Day 0 (OR 6.3 (95% confidence intervals 2.0-19.9), p = 0.02). Associations with all flares and hospitalizations for flares were also observed. However, an anti-dsDNA surge was not predictive of a renal flare. An anti-dsDNA surge predicts the subsequent development of a severe SS flare within six months. Physicians should closely monitor such patients and treat promptly at the first sign of clinical activity.

  2. Anti-idiotypic antibody-induced protection against Clostridium perfringens type D.

    OpenAIRE

    Percival, D A; Shuttleworth, A D; Williamson, E D; Kelly, D C

    1990-01-01

    A monoclonal antibody (BALB/c mouse) with specificity for a neutralizing epitope on the epsilon-toxin produced by Clostridium perfringens type D was used to raise anti-idiotypic antibodies (anti-Id) in different strains of mice and rabbits. These were purified and used in cross-immunization studies to induce anti-(anti-idiotype). All strains of mice and rabbits immunized with BALB/c-derived anti-Id showed a high-titer antibody response directed towards the active site of the toxin. This prote...

  3. Design of a titering assay for lentiviral vectors utilizing direct extraction of DNA from transduced cells in microtiter plates

    National Research Council Canada - National Science Library

    Murphy, Michele E; Vin, Chintan D; Slough, Megan M; Gombotz, Wayne R; Kelley-Clarke, Brenna

    2016-01-01

    .... For vectors lacking a marker gene, quantitative polymerase chain reaction is used to evaluate the number of vector DNA copies in transduced target cells, from which a transduction titer is calculated...

  4. Risk factors for inadequate antibody response to primary rabies vaccination in dogs under one year of age

    Science.gov (United States)

    Wallace, Ryan M.; Pees, Anna; Blanton, Jesse B.

    2017-01-01

    Ensuring the adequacy of response to rabies vaccination in dogs is important, particularly in the context of pet travel. Few studies have examined the factors associated with dogs’ failure to achieve an adequate antibody titer after vaccination (0.5 IU/ml). This study evaluated rabies antibody titers in dogs after primary vaccination. Dogs under one year of age whose serum was submitted to a reference laboratory for routine diagnostics, and which had no prior documented history of vaccination were enrolled (n = 8,011). Geometric mean titers (GMT) were calculated and univariate analysis was performed to assess factors associated with failure to achieve 0.5 IU/mL. Dogs vaccinated at >16 weeks of age had a significantly higher GMT compared to dogs vaccinated at a younger age (1.64 IU/ml, 1.57–1.72, ANOVA p vaccinated vaccinated 12–16 weeks (1.22 IU/ml and 1.21 IU/ml). The majority of dogs failed to reach an adequate titer within the first 3 days of primary vaccination; failure rates were also high if the interval from vaccination to titer check was greater than 90 days. Over 90% of dogs that failed primary vaccination were able to achieve adequate titers after booster vaccination. The ideal timing for blood draw is 8–30 days after primary vaccination. In the event of a failure, most dogs will achieve an adequate serologic response upon a repeat titer (in the absence of booster vaccination). Booster vaccination after failure provided the highest probability of an acceptable titer. PMID:28759602

  5. Risk factors for inadequate antibody response to primary rabies vaccination in dogs under one year of age.

    Science.gov (United States)

    Wallace, Ryan M; Pees, Anna; Blanton, Jesse B; Moore, Susan M

    2017-07-01

    Ensuring the adequacy of response to rabies vaccination in dogs is important, particularly in the context of pet travel. Few studies have examined the factors associated with dogs' failure to achieve an adequate antibody titer after vaccination (0.5 IU/ml). This study evaluated rabies antibody titers in dogs after primary vaccination. Dogs under one year of age whose serum was submitted to a reference laboratory for routine diagnostics, and which had no prior documented history of vaccination were enrolled (n = 8,011). Geometric mean titers (GMT) were calculated and univariate analysis was performed to assess factors associated with failure to achieve 0.5 IU/mL. Dogs vaccinated at >16 weeks of age had a significantly higher GMT compared to dogs vaccinated at a younger age (1.64 IU/ml, 1.57-1.72, ANOVA p < 0.01). There was no statistical difference in GMT between dogs vaccinated <12 weeks and dogs vaccinated 12-16 weeks (1.22 IU/ml and 1.21 IU/ml). The majority of dogs failed to reach an adequate titer within the first 3 days of primary vaccination; failure rates were also high if the interval from vaccination to titer check was greater than 90 days. Over 90% of dogs that failed primary vaccination were able to achieve adequate titers after booster vaccination. The ideal timing for blood draw is 8-30 days after primary vaccination. In the event of a failure, most dogs will achieve an adequate serologic response upon a repeat titer (in the absence of booster vaccination). Booster vaccination after failure provided the highest probability of an acceptable titer.

  6. A Comparative Study Of The Indirect Fluorescent Antibody Assay And Culture Method In Symptomatic Pulmonary Nocardiosis

    Directory of Open Access Journals (Sweden)

    Eshraghi S

    2004-09-01

    Full Text Available Background: Pulmonary Nocardiosis is an infrequent infection whose incidence seems to be on the rise due to a higher degree of clinical suspicion and to an increasing number of immunosuppressive factors. The present investigation was carried out to detect Nocardiosis in immunocompromised patients confined in the pulmonary ward of Tehran’s Shariati Training Hospital through the use of indirect immunofluorescence assay (IFA and bacterial culture methods. The comparison of the two methods and the correlation between the antibody titer and the statistical and epidemiological data were also investigated. Materials and Methods: 101 patients with advanced symptomatic pulmonary infection were studied in the course of a twenty-month period. Individual patients’ sputum, BAL (bronchoalveolar lavage and blood sera were tested. From each sample three thin smears were prepared for microscopic observations. The samples were cultured in Sabouraud’s dextrose, blood and paraffin agar. The detection of antibody against Nocardia asteroides was carried out in all study groups, using the IFA method. The medical history of patients was also obtained through questionnaires for further analysis. Results: Nocardia asteroides was isolated from only one patient suffering from Wagner vasculitis with an antibody titer of in serum. The 41 patients suspected for Nocardiosis with an antibody titer ranging from to , detected by IFA method, included 26 (63.4% men and 15 (14.8% women. The age of the patients varied from 7-80 years. Those with reasonable antibody titers included 15 (36.5% housewives and 9 (21.9% workers. Furthermore, in-vitro investigation for the differentiation of the isolates was performed and confirmed the notion that the organism which grew on the primary media was, indeed, the Nocardia asteroids complex. Conclusion: Our results revealed that the broncho-pulmonary infections, which occur in high-risk patients -T-cell deficiencies, long term

  7. Microscopic agglutination test on captive rattlesnakes : Data on serovars and titers

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    T.C.S. Rodrigues

    2016-06-01

    Full Text Available The microscopic agglutination test (MAT is considered the “golden standard” leptospirosis serodiagnostic test, but there is little information about it as it pertains to snakes. To fill this information gap, we provide data on serovars and titers of fifty-six Crotalus durissus collilineatus sera samples that tested positive by MAT (10.1016/j.actatropica.2016.02.006 (Rodrigues et al., 2016 [5]. These data are presented in a table, along with a description of the methodology used for sample collection and serologic testing.

  8. Generation of high-titer viral preparations by concentration using successive rounds of ultracentrifugation

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    Ichim Christine V

    2011-08-01

    Full Text Available Abstract Background Viral vectors provide a method of stably introducing exogenous DNA into cells that are not easily transfectable allowing for the ectopic expression or silencing of genes for therapeutic or experimental purposes. However, some cell types, in particular bone marrow cells, dendritic cells and neurons are difficult to transduce with viral vectors. Successful transduction of such cells requires preparation of highly concentrated viral stocks, which permit a high virus concentration and multiplicity of infection (MOI during transduction. Pseudotyping with the vesicular stomatitis virus G (VSV-G envelope protein is common practice for both lentiviral and retroviral vectors. The VSV-G glycoprotein adds physical stability to retroviral particles, allowing concentration of virus by high-speed ultracentrifugation. Here we describe a method report for concentration of virus from large volumes of culture supernatant by means of successive rounds of ultracentrifugation into the same ultracentrifuge tube. Method Stable retrovirus producer cell lines were generated and large volumes of virus-containing supernatant were produced. We then tested the transduction ability of virus following varying rounds of concentration by ultra-centrifugation. In a second series of experiments lentivirus-containing supernatant was produced by transient transfection of 297T/17 cells and again we tested the transduction ability of virus following multiple rounds of ultra-centrifugation. Results We report being able to centrifuge VSV-G coated retrovirus for as many as four rounds of ultracentrifugation while observing an additive increase in viral titer. Even after four rounds of ultracentrifugation we did not reach a plateau in viral titer relative to viral supernatant concentrated to indicate that we had reached the maximum tolerated centrifugation time, implying that it may be possible to centrifuge VSV-G coated retrovirus even further should it be necessary

  9. Prevalence of Toxoplasma gondii antibodies in barren-ground caribou (Rangifer tarandus groenlandicus) from the Canadian Arctic.

    Science.gov (United States)

    Kutz, S J; Elkin, B T; Panayi, D; Dubey, J P

    2001-04-01

    Prevalence of antibodies to Toxoplasma gondii was determined in 147 barren-ground caribou (Rangifer tarandus groenlandicus) from 5 herds in the Northwest Territories and Nunavut, northern Canada, by the modified agglutination test (MAT). In the mainland herds (Bluenose, Bathurst, and Beverly), antibodies were found in 43 (37%) of 117 caribou, and MAT titers were 1:25 in 10, 1:50 in 24, and 1:500 in 9. In the island herds, only 1 (4.3%) of 23 animals sampled from the North Baffin Island herd was positive (titer = 1:25) and no antibodies were detected in 7 caribou from the Dolphin and Union herd. The high prevalence of antibodies to T. gondii in the mainland caribou herds indicates that caribou meat may contain viable T. gondii.

  10. Does pretreatment human papillomavirus (HPV) titers predict radiation response and survival outcomes in cancer cervix?--a pilot study.

    Science.gov (United States)

    Datta, Niloy R; Kumar, Piyush; Singh, Shalini; Gupta, Dinesh; Srivastava, Anurita; Dhole, Tapankumar N

    2006-10-01

    To evaluate if pretreatment HPV titers in cancer cervix could predict radiation response and survival outcomes. Twenty-one patients of cancer cervix were treated by radiotherapy (RT) alone. HPV titers were estimated using DNA Hybrid Capture II test. Loco-regional response at 1 month of RT--complete or partial response (CR and PR respectively) and survival outcomes--local disease-free (LDFS), disease-free (DFS) and overall (OS) survivals were evaluated against pre- and posttreatment HPV titers. Pretreatment HPV titers ranged from 0.81 to 3966.10 RLU/cut off (mean +/- SD: 1264.39 +/- 1148.22, median: 1129.98). Of the demographic features evaluated, mean HPV titers were significantly different only for patients achieving CR or PR at completion of RT (mean +/- SD for CR vs. PR: 1616.31 +/- 1146.86 vs. 384.57 +/- 538.80, P = 0.022). HPV titers at end of RT ranged from 0.12 to 487.42 RLU/cut off (mean +/- SD: 37.31 +/- 108.60, median: 2.33). Patients with higher pretreatment HPV titers (>1000 RLU/cutoff) had a higher CR (P = 0.022) and better survival compared to those with or =99.5% fall in HPV had superior survival outcomes than those with 1000 RLU/cutoff) could be considered as a predictor of radiotherapy response and survival in cancer cervix. A reduction in these titers to 99.5% of their baseline values at end of radiotherapy is also associated with better survival outcomes.

  11. Persistence of antibodies six years after booster vaccination with inactivated vaccine against Japanese encephalitis.

    Science.gov (United States)

    Paulke-Korinek, Maria; Kollaritsch, Herwig; Kundi, Michael; Zwazl, Ines; Seidl-Friedrich, Claudia; Jelinek, Tomas

    2015-07-09

    Japanese Encephalitis (JE) virus occurs in wide regions of Asia with over 3 billion people living in areas at risk for JE. An estimated 68,000 clinical cases of JE occur every year, and vaccination is the most effective prophylactic measure. One internationally licensed vaccine containing the inactivated JE virus strain SA14-14-2 is Ixiaro (Valneva, Austria). According to recommendations, basic immunization consists of vaccinations on day 0, day 28, and a booster dose 12-24 months later. Protection in terms of neutralizing antibody titers has been assessed up to 12 months after the third dose of the vaccine. The current investigation was designed to evaluate antibody decline over time and to predict long-term duration of seroprotection after a booster dose. In a preceding trial, volunteers received basic immunization (day 0, day 28) and one booster dose against JE 15 months later. A follow up blood draw 6 years following their booster dose was carried out in 67 subjects. For antibody testing, a 50% plaque reduction neutralization test (PRNT50-test) was used. PRNT50 values of 10 and above are surrogate levels of protection according to WHO standards. Seventy-six months following the booster dose, 96% of the tested subjects had PRNT50 titers of 10 or higher. Geometric mean titer (GMT) was 148 (95% CI confidence interval: 107-207). Antibody titers were lower in volunteers 50 years of age and older. Vaccination history against other flaviviruses (yellow fever or tick borne encephalitis) did not significantly influence PRNT50 titers. A two-step log-linear decline model predicted protection against JE of approximately 14 years after the booster dose. Six years after a booster dose against JE, long-term protection could be demonstrated. According to our results, further booster doses should be scheduled 10 years following the first booster dose. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. Human antibodies against the myelin oligodendrocyte glycoprotein can cause complement-dependent demyelination.

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    Peschl, Patrick; Schanda, Kathrin; Zeka, Bleranda; Given, Katherine; Böhm, Denise; Ruprecht, Klemens; Saiz, Albert; Lutterotti, Andreas; Rostásy, Kevin; Höftberger, Romana; Berger, Thomas; Macklin, Wendy; Lassmann, Hans; Bradl, Monika; Bennett, Jeffrey L; Reindl, Markus

    2017-10-25

    Antibodies to the myelin oligodendrocyte glycoprotein (MOG) are associated with a subset of inflammatory demyelinating diseases of the central nervous system such as acute disseminated encephalomyelitis and neuromyelitis optica spectrum disorders. However, whether human MOG antibodies are pathogenic or an epiphenomenon is still not completely clear. Although MOG is highly conserved within mammals, previous findings showed that not all human MOG antibodies bind to rodent MOG. We therefore hypothesized that human MOG antibody-mediated pathology in animal models may only be evident using species-specific MOG antibodies. We screened 80 human MOG antibody-positive samples for their reactivity to mouse and rat MOG using either a live cell-based assay or immunohistochemistry on murine, rat, and human brain tissue. Selected samples reactive to either human MOG or rodent MOG were subsequently tested for their ability to induce complement-mediated damage in murine organotypic brain slices or enhance demyelination in an experimental autoimmune encephalitis (EAE) model in Lewis rats. The MOG monoclonal antibody 8-18-C5 was used as a positive control. Overall, we found that only a subset of human MOG antibodies are reactive to mouse (48/80, 60%) or rat (14/80, 18%) MOG. Purified serum antibodies from 10 human MOG antibody-positive patients (8/10 reactive to mouse MOG, 6/10 reactive to rat MOG), 3 human MOG-negative patients, and 3 healthy controls were tested on murine organotypic brain slices. Purified IgG from one patient with high titers of anti-human, mouse, and rat MOG antibodies and robust binding to myelin tissue produced significant, complement-mediated myelin loss in organotypic brain slices, but not in the EAE model. Monoclonal 8-18-C5 MOG antibody caused complement-mediated demyelination in both the organotypic brain slice model and in EAE. This study shows that a subset of human MOG antibodies can induce complement-dependent pathogenic effects in a murine ex vivo

  13. Measurement of antibodies to varicella-zoster virus using a virus-free fluorescent-antibody-to-membrane-antigen (FAMA) test.

    Science.gov (United States)

    Park, Rackhyun; Hwang, Ji Young; Lee, Kang Il; Namkoong, Sim; Choi, Seuk-Keun; Park, Songyong; Park, Hosun; Park, Junsoo

    2015-02-01

    The fluorescent-antibody-to-membrane-antigen (FAMA) test is regarded as the "gold standard" to detect protective antibodies to varicella-zoster virus (VZV) because of its high sensitivity and specificity. Because the classic FAMA test uses an infectious virus for detection of antibodies to VZV, it is labor-intensive, and also requires special equipment for handling the virus. For this reason, we attempted to develop a simple and safe FAMA assay. Because VZV glycoprotein E (gE) is one of the major VZV glycoproteins, we used the gE protein for the FAMA test (gE FAMA). Here, we demonstrate that overexpression of gE in HEK293T cells can be used to measure antibodies in human serum, and that gE FAMA titers are closely correlated with gpEIA ELISA data. These results indicate that our gE FAMA test has the potential to measure antibodies to VZV.

  14. A Case of Adenomyosis with a High Titer of IgG Autoantibody to Calreticulin

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    Neil M. Gude BSc, MSc, PhD

    2013-10-01

    Full Text Available Background. High prevalence of autoantibodies to the calcium-binding, endoplasmic reticulum chaperone protein calreticulin has been reported in various autoimmune and parasitic diseases. It has been reported that adenomyosis is associated with the presence of autoantibodies, in particular to phospholipids; however, it is not known whether it is associated with autoimmunity to calreticulin. Results. A 35-year-old gravida 4 para 4 woman presented with a history of many years of intractable menorrhagia. Histopathological examination of a subsequent hysterectomy specimen revealed a bulky uterus, a poorly developed secretory endometrium with decidualization of the stroma and chronic endometritis, as well as the presence of adenomyosis uteri. IgG autoantibodies to calreticulin were measured in the plasma of this and 234 other patients. Nine (3.8% patients tested positive. The titer of anticalreticulin IgG autoantibody in the sole case with adenomyosis was approximately 8 times the average of other positive-testing samples. Conclusions. The etiology of adenomyosis is unclear. The presence of a high titer, blocking anticalreticulin autoantibody may directly increase the risk that adenomyosis might develop. It is also possible that the expansion of endometrial glandular tissue, as well as elevated estrogens, during adenomyosis may lead to elevated calreticulin, which induces an autoimmune reaction to it. Further study is required to determine whether there is a significant association between adenomyosis and the prevalence of calreticulin autoantibodies.

  15. High titer ethanol and lignosulfonate production from SPORL pretreated poplar at pilot-scale

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    Junyong (J.Y. eZhu

    2015-04-01

    Full Text Available Poplar NE222 (Populus deltoides Bartr. ex Marsh × P. nigra L. wood chips were pretreated in a 390 L pilot-scale rotating wood-pulping digester using a dilute sulfite solution of approximately pH  1.8 at 160°C for 40 min for bioconversion to ethanol and lignosulfonate (LS. An estimated combined hydrolysis factor (CHF of 3.3 was used to scale the pretreatment temperature and time from laboratory bench scale experiments, which balanced sugar yield and inhibitor formation to facilitate high titer ethanol production through fermentation using S. cerevisiae YRH400 without detoxification. A terminal ethanol titer of 43.6 g L-1 with a yield of 247 L tonne wood-1 was achieved at total solids loading of 20%. The relatively low ethanol yield compared with yield from SPORL-pretreated softwoods was due to inefficient utilization of xylose. The LS from SPORL has a substantially higher phenolic group (Ph-OH content although it is less sulfonated and has a lower molecular weight than a purified commercial softwood LS, and therefore has potential for certain commercial markets and future novel applications through further processing.

  16. High-throughput pseudovirion-based neutralization assay for analysis of natural and vaccine-induced antibodies against human papillomaviruses.

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    Peter Sehr

    Full Text Available A highly sensitive, automated, purely add-on, high-throughput pseudovirion-based neutralization assay (HT-PBNA with excellent repeatability and run-to-run reproducibility was developed for human papillomavirus types (HPV 16, 18, 31, 45, 52, 58 and bovine papillomavirus type 1. Preparation of 384 well assay plates with serially diluted sera and the actual cell-based assay are separated in time, therefore batches of up to one hundred assay plates can be processed sequentially. A mean coefficient of variation (CV of 13% was obtained for anti-HPV 16 and HPV 18 titers for a standard serum tested in a total of 58 repeats on individual plates in seven independent runs. Natural antibody response was analyzed in 35 sera from patients with HPV 16 DNA positive cervical intraepithelial neoplasia grade 2+ lesions. The new HT-PBNA is based on Gaussia luciferase with increased sensitivity compared to the previously described manual PBNA (manPBNA based on secreted alkaline phosphatase as reporter. Titers obtained with HT-PBNA were generally higher than titers obtained with the manPBNA. A good linear correlation (R(2 = 0.7 was found between HT-PBNA titers and anti-HPV 16 L1 antibody-levels determined by a Luminex bead-based GST-capture assay for these 35 sera and a Kappa-value of 0.72, with only 3 discordant sera in the low titer range. In addition to natural low titer antibody responses the high sensitivity of the HT-PBNA also allows detection of cross-neutralizing antibodies induced by commercial HPV L1-vaccines and experimental L2-vaccines. When analyzing the WHO international standards for HPV 16 and 18 we determined an analytical sensitivity of 0.864 and 1.105 mIU, respectively.

  17. Human and chicken antibodies to gangliosides following infection by Campylobacter jejuni.

    Science.gov (United States)

    Usuki, Seigo; Taguchi, Kyoji; Cawthraw, Shaun A; Shibata, Keiko; Ariga, Toshio; Newell, Diane G; Yu, Robert K

    2006-07-01

    Campylobacteriosis is frequently associated with Guillain-Barré syndrome. Poultry are frequently highly colonized with Campylobacter jejuni and are a major foodborne vehicle for campylobacteriosis. In this study, high titer anti-GM1 antibodies were found in the serum of a laboratory worker who developed campylobacteriosis. The microbiologically confirmed strain VLA2/18 (non-serotyped) was isolated from the worker and subsequently inoculated into chickens, resulting in high titers of serum antibodies to GM1. However, none of the immunized chickens in our study showed any noticeable neurological symptoms, such as paralysis or cramping. High titer anti-GM1 antibodies in chicken and human sera strongly inhibited spontaneous muscle action potential in an in vitro system of spinal cord and muscle cell co-culture. In addition, infection of chickens with C. jejuni strains 81116 (HS6) and 99/419 (HS21) or immunization with purified GM1, GM2, and GM3 resulted in elevation of serum anti-ganglioside antibodies with an inhibitory effect on spontaneous muscle action potential. Immunoabsorption studies demonstrated that this inhibitory activity is due to anti-ganglioside antibodies. On the other hand, anti-GM1 is the only specific human serum antibody to induce an inhibitory effect on neuromuscular junctions. Chicken anti-GM1 antibodies showed a strong inhibitory effect, but anti-GM2 and -GM3 had weaker activities. Taken together, our data suggest that campylobacteriosis in chickens may provide a strong link between infection and the development of anti-ganglioside antibody-mediated peripheral nerve dysfunctions.

  18. Neutralizing Antibody Responses to Antigenically Drifted Influenza A(H3N2) Viruses among Children and Adolescents following 2014-2015 Inactivated and Live Attenuated Influenza Vaccination

    Science.gov (United States)

    Martin, Judith M.; Gross, F. Liaini; Jefferson, Stacie; Cole, Kelly Stefano; Archibald, Crystal Ann; Nowalk, Mary Patricia; Susick, Michael; Moehling, Krissy; Spencer, Sarah; Chung, Jessie R.; Flannery, Brendan; Zimmerman, Richard K.

    2016-01-01

    Human influenza A(H3N2) viruses that predominated during the moderately severe 2014-2015 influenza season differed antigenically from the vaccine component, resulting in reduced vaccine effectiveness (VE). To examine antibody responses to 2014-2015 inactivated influenza vaccine (IIV) and live-attenuated influenza vaccine (LAIV) among children and adolescents, we collected sera before and after vaccination from 150 children aged 3 to 17 years enrolled at health care facilities. Hemagglutination inhibition (HI) assays were used to assess the antibody responses to vaccine strains. We evaluated cross-reactive antibody responses against two representative A(H3N2) viruses that had antigenically drifted from the A(H3N2) vaccine component using microneutralization (MN) assays. Postvaccination antibody titers to drifted A(H3N2) viruses were higher following receipt of IIV (MN geometric mean titers [GMTs], 63 to 68; 38 to 45% achieved seroconversion) versus LAIV (MN GMT, 22; only 3 to 5% achieved seroconversion). In 9- to 17-year-olds, the highest MN titers were observed among IIV-vaccinated individuals who had received LAIV in the previous season. Among all IIV recipients aged 3 to 17 years, the strongest predictor of antibody responses to the drifted viruses was the prevaccination titers to the vaccine strain. The results of our study suggest that in an antigenically drifted influenza season, vaccination still induced cross-reactive antibody responses to drifted circulating A(H3N2) viruses, although higher antibody titers may be required for protection. Antibody responses to drifted A(H3N2) viruses following vaccination were influenced by multiple factors, including vaccine type and preexisting immunity from prior exposure. PMID:27558294

  19. Anti-leishmania antibodies in cerebrospinal fluid from dogs with visceral leishmaniasis

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    V.M.F. Lima

    2003-04-01

    Full Text Available Visceral leishmaniasis in Brazil is caused by Leishmania (Leishmania chagasi and the dog is its most important reservoir. The clinical features in dogs include loss of weight, lymphadenopathy, renal failure, skin lesions, fever, hypergammaglobulinemia, hepatosplenomegaly, anemia, and, rarely, neurological symptoms. Most infected animals develop active disease, characterized by high anti-leishmania antibody titers and depressed lymphoproliferative ability. Antibody production is not primarily important for protection but might be involved in the pathogenesis of tissue lesions. An ELISA test was used to determine if there is an association between neurological symptoms and the presence of anti-L. chagasi antibodies in cerebrospinal fluid (CSF. Thirty serum and CSF samples from symptomatic mixed breed dogs (three with neurological symptoms from a region of high incidence of visceral leishmaniasis in Brazil were examined for antibody using total parasite antigen and anti-dog IgG peroxidase conjugate. A high level of L. chagasi antibodies was observed in sera (mean absorbance ± SD, 1.939 ± 0.405; negative control, N = 20, 0.154 ± 0.074 and CSF (1.571 ± 0.532; negative control, N = 10, 0.0195 ± 0.040 from all animals studied. This observation suggests that L. chagasi can cause breakdown of filtration barriers and the transfer of antibodies and antigens from the blood to the CSF compartment. No correlation was observed between antibody titer in CSF and neurological symptoms.

  20. Association of Helicobacter pylori IgG antibody with various demographic and biochemical parameters in kidney transplant recipients

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    Azar Baradaran

    2011-01-01

    Full Text Available Few reports are available regarding the promoting factors that affect Helicobacter pylori (H. pylori infection in renal transplant (RTx patients. We report a cross-sectional study that was conducted on a group of stable RTx patients to investigate the relationship of various demographic and biochemical parameters of these patients with serum H. pylori IgG antibody titer as a sign of H. pylori infection. A total of 72 patients who were referred to the clinic for continuing their treatment were enrolled in this study. These patients included 47 males and 25 females. The mean age of the study patients was 44 (±12 years. The mean length of time after they received a transplanted kidney was 67.5 (±42 months (median: 62 months. The mean value of serum H. pylori-specific IgG antibody titer among these patients was 3 (±4.6 U/mL (median: 1 U/mL, and that of intact parathormone (iPTH was 18.4 (±8.2 pg/mL (median: 16.5 pg/mL. The mean serum magnesium (Mg was 1.9 (±0.20 mg/dL (median: 1.9 mg/dL and the mean creatinine clearance was 53 (±11 mL/min (median: 56 mL/min. In this study population, there was no significant difference in the H. pylori IgG antibody titers, serum iPTH, Mg, calcium, alkaline phosphatase and albumin levels as well as body mass index (BMI between males and females or diabetics and non-diabetics. There was no significant relationship between serum H. pylori IgG antibody titers and the age of the patients, BMI, serum Alb, phosphorus, Ca, serum leptin and serum ALP. Significant negative correlation between serum H. pylori IgG antibody titers and serum Mg (r = -0.30, P = 0.01 and serum iPTH (r = -0.25, P = 0.03 was seen. A significant positive correlation was found between serum H. pylori IgG antibody titer and creatinine clearance (r = 0.26, P = 0.02, and a near-significant positive correlation was found with the duration of RTx (r = 0.20, P = 0.08. Our study shows that the correlation of H. pylori IgG antibody titer with some

  1. Antimitochondrial antibodies in patients with chronic hepatitis C.

    Science.gov (United States)

    Grimbert, S; Johanet, C; Bendjaballah, F; Homberg, J C; Poupon, R; Beaugrand, M

    1996-06-01

    Although autoantibodies have been found in the serum of patients with chronic hepatitis C virus (HCV) there has been no convincing evidence of the presence of antimitochondrial antibodies, until now. Sera from 460 untreated patients with chronic hepatitis C were tested for antimitochondrial antibodies, using an indirect immunofluorescence technique; and if they tested positive for the antibodies (titer more than 1:50), they also were treated by Western blot analysis. Seven (1.5%) sera were positive. None of the patients had biological or histological evidence of primary biliary cirrhosis. Antimitochondrial antibodies recognized one of the oxo-dehydrogenase multienzyme complexe's epitopes by Western blot assay in three patients only. All seven patients were then treated by interferon alpha for six months. None showed exacerbation of liver disease during treatment. HCV-RNA disappeared from the serum in one patient who became negative for anti-M2 antibodies. The four patients who did not respond to interferon-alpha therapy, and the two who relapsed after treatment withdrawal, had sustained positive antimitochondrial antibodies. These data suggest that: 1) antimitochondrial antibodies present in patients with chronic hepatitis C do not always recognize the same epitopes as in primary biliary cirrhosis; 2) these antibodies may disappear after eradication of HCV, suggesting that the production of antimitochondrial antibodies is linked to the presence of the virus and 3) the clinical and biological course of chronic hepatitis C, and the response to interferon-alpha therapy, does not seem to be different in patients who are positive for antimitochondrial antibodies.

  2. Dissection of antibody specificities induced by yellow fever vaccination.

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    Oksana Vratskikh

    Full Text Available The live attenuated yellow fever (YF vaccine has an excellent record of efficacy and one dose provides long-lasting immunity, which in many cases may last a lifetime. Vaccination stimulates strong innate and adaptive immune responses, and neutralizing antibodies are considered to be the major effectors that correlate with protection from disease. Similar to other flaviviruses, such antibodies are primarily induced by the viral envelope protein E, which consists of three distinct domains (DI, II, and III and is presented at the surface of mature flavivirions in an icosahedral arrangement. In general, the dominance and individual variation of antibodies to different domains of viral surface proteins and their impact on neutralizing activity are aspects of humoral immunity that are not well understood. To gain insight into these phenomena, we established a platform of immunoassays using recombinant proteins and protein domains that allowed us to dissect and quantify fine specificities of the polyclonal antibody response after YF vaccination in a panel of 51 vaccinees as well as determine their contribution to virus neutralization by serum depletion analyses. Our data revealed a high degree of individual variation in antibody specificities present in post-vaccination sera and differences in the contribution of different antibody subsets to virus neutralization. Irrespective of individual variation, a substantial proportion of neutralizing activity appeared to be due to antibodies directed to complex quaternary epitopes displayed on the virion surface only but not on monomeric E. On the other hand, DIII-specific antibodies (presumed to have the highest neutralizing activity as well as broadly flavivirus cross-reactive antibodies were absent or present at very low titers. These data provide new information on the fine specificity as well as variability of antibody responses after YF vaccination that are consistent with a strong influence of individual

  3. Evaluation of antibodies against glycoprotein D (gD) and glycoprotein G (gG) in HSV-1 infected individuals' serum samples.

    Science.gov (United States)

    Meshkat, Z; Roostaee, M H; Soleimanjahi, M; Zandi, K

    2012-04-01

    Glycoproteins D (gD) and G (gG) of herpes simplex virus type 1 (HSV-1) are virus envelope glycoproteins that are able to induce HSV-1 antibody production in infected persons. Therefore, those proteins could be in interest to develop the serodiagnostic test(s) for HSV antibody detection. The aim of present study was the comparison of anti-gD and anti-gG antibodies in HSV-1 infected individuals' serum samples. In this study, recombinant gD and gG were prepared and used for western blot test to detect the antibodies against HSV-1. Our data showed the total gD antibody titer was higher than gG antibody titer in the HSV-1 infected patient's sera but the gG antibody titer was high significantly. According to our results, gD and gG can be used for designing the diagnostic laboratory tests to evaluate total antibody against HSV-1 and HSV-2.

  4. Long-term humoral antibody responses by various serologic tests in pigs orally inoculated with oocysts of four strains of Toxoplasma gondii

    DEFF Research Database (Denmark)

    Dubey, J.P.; Andrews, C.D.; Thulliez, P.

    1997-01-01

    Antibody titers to Toxoplasma gondii were determined in 16 pigs orally inoculated with 1000 or 10000 oocysts of one of the four strains (GT-1, ME-49, TS-2, TC-2) of T. gondii. Pigs were euthanized on postinoculation days 103-875 and their tissues were bioassayed for T. gondii. Antibody titers were...... measured in the modified agglutination test (MAT) using formalin-preserved (test A) or acetone-preserved (test B) tachyzoites, latex agglutination test (LAT), indirect hemagglutination test (IHA), enzyme-linked immunobsorbant assay (ELISA), and the Sabin-Feldman dye test (DT). Toxoplasma gondii...

  5. Anti-Chol-1 antigen, GQ1bα, antibodies are associated with Alzheimer's disease.

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    Toshio Ariga

    Full Text Available The interaction of amyloid β-proteins (Aβ with membrane gangliosides has been reported to be an early event in Aβ fibril formation in Alzheimer's disease (AD. Neuronal degeneration in AD has been postulated to be associated with the presence of anti-ganglioside antibodies in patient sera. Using an enzyme-linked immunosorbent assay (ELISA and high-performance thin-layer chromatography (HPTLC immunostaining, sera from 27 individuals (10 with AD, 6 with vascular dementia (VD, and 11 non-demented age-matched pathological controls were examined in order to detect anti-glycosphingolipid (GSL antibodies, including anti-cholinergic-specific antigen (Chol-1α; GQ1bα antibodies. All sera had natural antibodies against ganglio-N-tetraosyl gangliosides (brain-type gangliosides. However, sera of demented patients with AD and VD had significantly higher titers of anti-GSL antibodies than those in age-matched pathological controls. Although most serum antibodies, including anti- GM1, -GT1b, -GQ1b, -GQ1bα, were of the IgM type, the presence of the IgG type antibodies was also significantly elevated in the sera of demented patients with AD. Anti-GT1b antibodies of the IgG type were elevated in AD (90%, 9 of 10 cases and VD (100%, respectively. Most surprisingly, anti-GQ1bα antibodies (IgM were found in 90% (9/10 and 100% (6/6 in the sera of patients with AD and VD, respectively. Since GQ1bα is present in the cerebral cortex and hippocampus, the presence of anti-GQ1bα antibodies may play an important role in disrupting cholinergic synaptic transmission and may participate in the pathogenesis of dementia. We conclude that elevated anti-GSL antibody titers may be useful as an aid for clinical diagnosis of those dementias.

  6. Significance of persistence of antibodies against Leishmania infantum in Sicilian patients affected by acute visceral leishmaniasis.

    Science.gov (United States)

    Mansueto, Pasquale; Pepe, Ilenia; Seidita, Aurelio; Scozzari, Francesca; Vitale, Giustina; Arcoleo, Francesco; Elvira, Inglese; Cillari, Enrico; Rini, Giovam Battista; Napoli, Nicola; Di Rosa, Salvatore; Mansueto, Serafino; Di Fede, Gaetana

    2012-06-01

    The background of this article is as follows: Few data are available about the persistence of serum-specific IgG antibodies to L. infantum after acute VL. The objective of this article is to evaluate the persistence of antibodies against L. infantum in patients healed from acute VL, and the kinetic of the same antibodies observed in 2 cases of VL relapse and 2 cases of resistance to therapy. The methods which we used to obtain our objective are the following: 55 apparently immunocompetent, HIV-negative patients were examined for antibodies to L. infantum by IFAT over 14 years period, and we got the following results: Serum-specific IgG antibodies titers decrease slowly, but constantly. In the patients with a diagnosis of VL relapse, the kinetic of antibodies was characterized by an initial reduction, and a subsequent antibody levels rapidly increase, while in the patients with a clinical and parasitological diagnosis of VL not responding to specific therapy, we demonstrated persistent high level of antibodies to L. infantum. Finally, we conclude that specific antibodies to L. infantum might persist for many years, and decrease slowly, but steadily. The persistence of these specific antibodies is not related to poor therapeutic response or prognosis, but an acute increase in their levels might be a sentinel of a VL relapse, while persistence of high antibody levels could suggest a resistance to therapy.

  7. Highly efficient selection of epitope specific antibody through competitive yeast display library sorting.

    Science.gov (United States)

    Puri, Vinita; Streaker, Emily; Prabakaran, Ponraj; Zhu, Zhongyu; Dimitrov, Dimiter S

    2013-01-01

    Combinatory antibody library display technologies have been invented and successfully implemented for the selection and engineering of therapeutic antibodies. Precise targeting of important epitopes on the protein of interest is essential for such isolated antibodies to serve as effective modulators of molecular interactions. We developed a strategy to efficiently isolate antibodies against a specific epitope on a target protein from a yeast display antibody library using dengue virus envelope protein domain III as a model target. A domain III mutant protein with a key mutation inside a cross-reactive neutralizing epitope was designed, expressed, and used in the competitive panning of a yeast display naïve antibody library. All the yeast display antibodies that bound to the wild type domain III but not to the mutant were selectively sorted and characterized. Two unique clones were identified and showed cross-reactive binding to envelope protein domain IIIs from different serotypes. Epitope mapping of one of the antibodies confirmed that its epitope overlapped with the intended neutralizing epitope. This novel approach has implications for many areas of research where the isolation of epitope-specific antibodies is desired, such as selecting antibodies against conserved epitope(s) of viral envelope proteins from a library containing high titer, high affinity non-neutralizing antibodies, and targeting unique epitopes on cancer-related proteins.

  8. Production and Characterization of Monoclonal Antibodies to Soluble Rat Lung Guanylate Cyclase

    Science.gov (United States)

    Brandwein, Harvey; Lewicki, John; Murad, Ferid

    1981-07-01

    Four monoclonal antibodies to rat lung soluble guanylate cyclase [GTP pyrophosphate-lyase (cyclizing) EC 4.6.1.2] have been produced by fusing spleen cells from immunized BALB/c mice with SP-2/0 myeloma cells. The antibodies were detected by their ability to bind immobilized guanylate cyclase and by immunoprecipitation of purified enzyme in the presence of second (rabbit anti-mouse) antibody. After subcloning by limiting dilution, hybridomas were injected intraperitoneally into mice to produce ascitic fluid containing 2-5 mg of antibody per ml. The four antibodies obtained had titers of between 1:1580 and 1:3160 but were detectable at dilutions greater than 1:20,000. Soluble guanylate cyclase from several rat tissues were crossreactive with the four monoclonal antibodies, suggesting that the soluble enzyme from different rat tissues is antigenically similar. The antibodies also recognized soluble lung enzyme from rat, beef, and pig, while enzyme from rabbit was not crossreactive and mouse enzyme was recognized by only one of the antibodies. Particulate guanylate cyclase from a number of tissues had only minimal crossreactivity with the antibodies. Immunoprecipitated guanylate cyclase retained catalytic activity, could be activated with sodium nitroprusside, and was inhibited by cystamine. None of the antibodies were inhibitory under the conditions examined. These antibodies will be useful probes for the study of guanylate cyclase regulation and function under a variety of physiological conditions.

  9. Mixed adjuvant formulations reveal a new combination that elicit antibody response comparable to Freund's adjuvants.

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    Rachel P J Lai

    Full Text Available Adjuvant formulations capable of inducing high titer and high affinity antibody responses would provide a major advance in the development of vaccines to viral infections such as HIV-1. Although oil-in-water emulsions, such as Freund's adjuvant (FCA/FIA, are known to be potent, their toxicity and reactogenicity make them unacceptable for human use. Here, we explored different adjuvants and compared their ability to elicit antibody responses to FCA/FIA. Recombinant soluble trimeric HIV-1 gp140 antigen was formulated in different adjuvants, including FCA/FIA, Carbopol-971P, Carbopol-974P and the licensed adjuvant MF59, or combinations of MF59 and Carbopol. The antigen-adjuvant formulation was administered in a prime-boost regimen into rabbits, and elicitation of antigen binding and neutralizing antibodies (nAbs was evaluated. When used individually, only FCA/FIA elicited significantly higher titer of nAbs than the control group (gp140 in PBS (p<0.05. Sequential prime-boost immunizations with different adjuvants did not offer improvements over the use of FCA/FIA or MF59. Remarkably however, the concurrent use of the combination of Carbopol-971P and MF59 induced potent adjuvant activity with significantly higher titer nAbs than FCA/FIA (p<0.05. This combination was not associated with any obvious local or systemic adverse effects. Antibody competition indicated that the majority of the neutralizing activities were directed to the CD4 binding site (CD4bs. Increased antibody titers to the gp41 membrane proximal external region (MPER and gp120 V3 were detected when the more potent adjuvants were used. These data reveal that the combination of Carbopol-971P and MF59 is unusually potent for eliciting nAbs to a variety of HIV-1 nAb epitopes.

  10. Antibodies and Selection of Monoclonal Antibodies.

    Science.gov (United States)

    Hanack, Katja; Messerschmidt, Katrin; Listek, Martin

    Monoclonal antibodies are universal binding molecules with a high specificity for their target and are indispensable tools in research, diagnostics and therapy. The biotechnological generation of monoclonal antibodies was enabled by the hybridoma technology published in 1975 by Köhler and Milstein. Today monoclonal antibodies are used in a variety of applications as flow cytometry, magnetic cell sorting, immunoassays or therapeutic approaches. First step of the generation process is the immunization of the organism with appropriate antigen. After a positive immune response the spleen cells are isolated and fused with myeloma cells in order to generate stable, long-living antibody-producing cell lines - hybridoma cells. In the subsequent identification step the culture supernatants of all hybridoma cells are screened weekly for the production of the antibody of interest. Hybridoma cells producing the antibody of interest are cloned by limited dilution till a monoclonal hybridoma is found. This is a very time-consuming and laborious process and therefore different selection strategies were developed since 1975 in order to facilitate the generation of monoclonal antibodies. Apart from common automation of pipetting processes and ELISA testing there are some promising approaches to select the right monoclonal antibody very early in the process to reduce time and effort of the generation. In this chapter different selection strategies for antibody-producing hybridoma cells are presented and analysed regarding to their benefits compared to conventional limited dilution technology.

  11. Aquaporin-4 antibody titration in NMO patients treated with rituximab: A retrospective study.

    Science.gov (United States)

    Valentino, Paola; Marnetto, Fabiana; Granieri, Letizia; Capobianco, Marco; Bertolotto, Antonio

    2017-03-01

    We undertook an observational retrospective study to investigate the usefulness of aquaporin-4 (AQP4) antibodies (Ab) titration in the management of patients with neuromyelitis optica (NMO) treated with rituximab (RTX) by studying (1) the correlation between AQP4-Ab titer and disease activity, (2) the influence of RTX on antibody levels, and (3) the association between AQP4-Ab levels and responsiveness to RTX. A cell-based assay was used for AQP4-Ab titration in 322 serum samples from 7 patients with NMO treated with RTX (median follow-up 65 months), according to a treatment-to-target approach. Serum samples were collected every month following standardized procedures. (1) In group analysis, AQP4-Ab titers correlated with the disease activity, showing higher titers during and preceding relapses than during remission. However, in individual analysis, an increase in AQP4-Ab titers and CD19+ B cells did not always precede a relapse. (2) A reduction of AQP4-Ab titers in the short-term and long-term period was observed during RTX treatment. (3) Reduction of AQP4-Ab titers was observed in responder patients both 3 months after RTX infusion and in the long-term follow-up. In one nonresponder patient, AQP4-Ab levels never decreased during the treatment period. Titration of AQP4-Abs could be useful in the clinical management of patients with NMO treated with RTX: titration before each reinfusion and 3 months after each reinfusion may provide information about responsiveness to RTX. Although a relationship among AQP4-Ab levels, disease activity, and response to RTX was observed, the usefulness of AQP4-Ab titration to predict relapses is limited.

  12. Construction of a High Titer Infectious HIV-1 Subtype C Proviral Clone from South Africa

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    Jochen Bodem

    2012-09-01

    Full Text Available The Human Immunodeficiency Virus type 1 (HIV-1 subtype C is currently the predominant subtype worldwide. Cell culture studies of Sub-Saharan African subtype C proviral plasmids are hampered by the low replication capacity of the resulting viruses, although viral loads in subtype C infected patients are as high as those from patients with subtype B. Here, we describe the sequencing and construction of a new HIV-1 subtype C proviral clone (pZAC, replicating more than one order of magnitude better than the previous subtype C plasmids. We identify the env-region for being the determinant for the higher viral titers and the pZAC Env to be M-tropic. This higher replication capacity does not lead to a higher cytotoxicity compared to previously described subtype C viruses. In addition, the pZAC Vpu is also shown to be able to down-regulate CD4, but fails to fully counteract CD317.

  13. An unusual presentation of brucellosis, involving multiple organ systems, with low agglutinating titers: a case report

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    Khorvash Farzin

    2007-07-01

    Full Text Available Abstract Background Brucellosis is a multi-system disease that may present with a broad spectrum of clinical manifestations. While hepatic involvement in brucellosis is not rare, it may rarely involve the kidney or display with cardiac manifestations. Central nervous system involvement in brucellosis sometimes can cause demyelinating syndromes. Here we present a case of brucella hepatitis, myocarditis, acute disseminated encephalomyelitis, and renal failure. Case presentation A 26-year-old man presented with fever, ataxia, and dysarthria. He was a shepherd and gave a history of low grade fever, chilly sensation, cold sweating, loss of appetite, arthralgia and 10 Kg weight loss during the previous 3 months. He had a body temperature of 39°C at the time of admission. On laboratory tests he had elevated level of liver enzymes, blood urea nitrogen, Creatinine, Creatine phosphokinase (MB, and moderate proteinuria. He also had abnormal echocardiography and brain MRI. Enzyme-linked immunosorbent assay for IgG and IgM was negative. Standard tube agglutination test (STAT and 2-mercaptoethanol (2-ME titers were 1:80 and 1:40 respectively. Finally he was diagnosed with brucellosis by positive blood culture and the polymerase chain reaction for Brucella mellitensis. Conclusion In endemic areas clinicians should consider brucellosis in any unusual presentation involving multiple organ systems, even if serology is inconclusive. In endemic areas low STAT and 2-ME titers should be considered as an indication of brucellosis and in these cases additional testing is recommended to rule out brucellosis.

  14. Seroprevalence of Toxoplasma gondii antibodies in wild dolphins from the Spanish Mediterranean coast.

    Science.gov (United States)

    Cabezón, O; Resendes, A R; Domingo, M; Raga, J A; Agustí, C; Alegre, F; Mons, J L; Dubey, J P; Almería, S

    2004-06-01

    Although Toxoplasma gondii infection has been found occasionally in cetaceans, little is known of the prevalence of antibodies to T. gondii in wild dolphins. Antibodies to T. gondii were determined in serum samples from 58 dolphins stranded in the Spanish Mediterranean coast. Modified agglutination test was used to determine T. gondii antibodies, and a titer of 1:25 was considered indicative of T. gondii infection. Antibodies to T. gondii were found in 4 of 36 striped dolphins (Stenella coeruleoalba), in 2 of 4 common dolphins (Delphinus delphis), in 4 of 7 bottlenose dolphins (Tursiops truncatus), and in 1 harbour porpoise (Phocoena phocoena). Antibodies were not found in 9 Risso's dolphins (Grampus griseus) and in 1 long-finned pilot whale (Globicephala melas) surveyed. The results indicate that T. gondii infection is frequent in at least 3 dolphin species from the Mediterranean Sea.

  15. Avian influenza virus antibodies in Pacific Coast Red Knots (Calidris canutus rufa)

    Science.gov (United States)

    Johnson, James A.; DeCicco, Lucas H.; Ruthrauff, Daniel R.; Krauss, Scott; Hall, Jeffrey S.

    2014-01-01

    Prevalence of avian influenza virus (AIV) antibodies in the western Atlantic subspecies of Red Knot (Calidris canutus rufa) is among the highest for any shorebird. To assess whether the frequency of detection of AIV antibodies is high for the species in general or restricted only to C. c. rufa, we sampled the northeastern Pacific Coast subspecies of Red Knot (Calidris canutus roselaari) breeding in northwestern Alaska. Antibodies were detected in 90% of adults and none of the chicks sampled. Viral shedding was not detected in adults or chicks. These results suggest a predisposition of Red Knots to AIV infection. High antibody titers to subtypes H3 and H4 were detected, whereas low to intermediate antibody levels were found for subtypes H10 and H11. These four subtypes have previously been detected in shorebirds at Delaware Bay (at the border of New Jersey and Delaware) and in waterfowl along the Pacific Coast of North America.

  16. Persistence and avidity maturation of antibodies to A(H1N1)pdm09 in healthcare workers following repeated annual vaccinations.

    Science.gov (United States)

    Eidem, Synnøve; Tete, Sarah M; Jul-Larsen, Åsne; Hoschler, Katja; Montomoli, Emanuele; Brokstad, Karl A; Cox, Rebecca J

    2015-08-07

    Healthcare workers are at increased risk of influenza infection through direct patient care, particularly during the early stages of a pandemic. Although influenza vaccination is widely recommended in Healthcare workers, data on long-term immunogenicity of vaccination in healthcare workers are lacking. The present study was designed to assess the persistence of the humoral response after pandemic vaccination as well as the impact of repeated annual vaccination in healthcare workers (n=24). Pandemic influenza vaccination resulted in a significant increase in haemagglutination inhibition (HI) antibody titers with 93-100% of subjects achieving protective titers 21-days post each of the three annual vaccinations. Seroprotective antibodies measured by HI, microneutralization and single radial hemolysis assays were present in 77-94% of healthcare workers 6 months post-vaccination. Repeated vaccination resulted in an increased duration of seroprotective antibodies with seroprotective titers increasing from 35-62% 12 months after 2009 pandemic vaccination to 50-75% 12 months after 2010 vaccination. Furthermore, repeated annual vaccination augmented the avidity of influenza-specific IgG antibodies. In conclusion, we have shown that A(H1N1)pdm09 vaccination induces high seroprotective titers that persist for at least 6 months. We demonstrate that repeated vaccination is beneficial to healthcare workers and results in further avidity maturation of vaccine-induced antibodies. Copyright © 2015 Elsevier Ltd. All rights reserved.

  17. Postdose 3 G1 serum neutralizing antibody as correlate of protection for pentavalent rotavirus vaccine.

    Science.gov (United States)

    Liu, G Frank; Hille, Darcy; Kaplan, Susan S; Goveia, Michelle G

    2017-10-03

    Although clinical trials of the pentavalent rotavirus vaccine (RotaTeq®, RV5) have demonstrated efficacy against RV gastroenteritis (RGE) in low and high-income settings, a clear correlate of protection or a measure of immune response that could predict efficacy has yet to be identified. This is the first time that immunogenicity data with both serum neutralized antibody (SNA) titers and anti-RV IgA titers from several clinical efficacy trials were pooled to provide a unique context for evaluating the correlation between immunogenicity and RGE risk or efficacy of RV5. The correlation between immunogenicity and RGE risk is evaluated with data at the individual subject level. The analyses show that higher Postdose 3 (PD3) G1 SNA titers are associated with lower odds of contracting any RGE. The correlation between immunogenicity and efficacy is assessed using aggregated population level data, which shows higher efficacy associated with higher PD3 G1 SNA geometric mean titer (GMT) ratio (between RV5 and placebo) and PD3 serum anti-RV IgA GMT ratio. Among high-income countries, efficacy plateaus over the range of PD3 G1 SNA GMT ratios and PD3 serum anti-RV IgA GMT ratios. From both individual- and population-level analyses, PD3 G1 SNA titers correlated most closely with the RGE risk or efficacy for RV5.

  18. Antibodies against canine parvovirus of wolves of Minnesota: A serologic study from 1975 through 1985

    Science.gov (United States)

    Goyal, S.M.; Mech, L.D.; Rademacher, R.A.; Khan, M.A.; Seal, U.S.

    1986-01-01

    Serum samples (n = 137) from 47 wild wolves (Canis lupus; 21 pups and 26 adults) were evaluated from 1975 to 1985 for antibodies against canine parvovirus, using the hemagglutination inhibition (HI) test. In addition, several blood samples (n = 35) from 14 of these wolves (6 pups and 8 adults) were evaluated simultaneously for erythrocyte and leukocyte counts, and for hemoglobin and blood urea nitrogen concentrations. Sixty-nine (50%) of the serum samples (35 wolves) had HI titers of greater than or equal to 256, whereas 68 (50%) of the samples (16 wolves) had HI titers of less than or equal to 128. Significant differences in the geometric mean titers were not found between pups and adults or between males and females. Of the 47 wolves evaluated, 12 (25%) developed a greater than or equal to fourfold increase in antibody titers during the 11-year period, with 2 wolves developing serologic conversions in 1976. The data indicate that canine parvovirus may have begun infecting wolves before or at the same time that it began infecting the dog population in the United States.

  19. Serial analysis of antimitochondrial antibody in patients with primary biliary cirrhosis.

    Science.gov (United States)

    Benson, Gordon D; Kikuchi, Kentaro; Miyakawa, Hiroshi; Tanaka, Atsushi; Watnik, Mitchell R; Gershwin, M Eric

    2004-06-01

    Antimitochondrial antibodies (AMAs) are the classic serologic marker in primary biliary cirrhosis (PBC). However, there have been only limited attempts to study changes in titer or isotype analysis of such AMAs in patients followed for long periods of time. We took advantage of stored sera from well-characterized patients with PBC followed for a period of 7-28 years (mean duration of 13.5 years). Immunoblot and enzyme-linked immunosorbant assays were performed against PDC-E2, BCOADC-E2 and OGDC-E2 as well as isotype analysis of antigen-specific IgG, IgA and IgM antibodies against each of these mitochondrial autoantigens. Sera were analyzed for total IgG, IgA and IgM by radial immunodiffusion. The sera titer of AMAs was significantly higher in younger patients with PBC. Indeed, age of onset of clinical PBC was a significant predictor for the highest values of sera AMAs. In contrast, the AMA titer did not significantly change over time in this prolonged longitudinal study. The total sera levels of the individual immunoglobulins did not show a time-dependent change, when based on age of onset of the disease. Higher titers of AMAs were noted in the younger patients. Furthermore, despite this long follow-up, there was no evidence for a significant change in AMA levels; also, levels were not influenced by drug therapy used during the period of observation.

  20. Anti-Cyclic Citrullinated Peptide Antibodies and Severity of Interstitial Lung Disease in Women with Rheumatoid Arthritis

    Science.gov (United States)

    Ponce-Guarneros, Manuel; Mejía, Mayra; Juárez-Contreras, Pablo; Corona-Sánchez, Esther Guadalupe; Rodríguez-Hernández, Tania Marlen; Salazar-Páramo, Mario; Cardona-Muñoz, Ernesto German; Celis, Alfredo; González-Lopez, Laura

    2015-01-01

    Objective. To evaluate whether serum titers of second-generation anticyclic citrullinated peptide antibodies (anti-CCP2) are associated with the severity and extent of interstitial lung disease in rheumatoid arthritis (RA-ILD). Methods. In across-sectional study, 39 RA-ILD patients confirmed by high-resolution computed tomography (HRCT) were compared with 42 RA without lung involvement (RA only). Characteristics related to RA-ILD were assessed in all of the patients and serum anti-CCP2 titers quantified. Results. Higher anti-CCP2 titers were found in RA-ILD compared with RA only (medians 77.9 versus 30.2 U/mL, P < 0.001). In the logistic regression analysis after adjustment for age, disease duration (DD), smoke exposure, disease activity, functioning, erythrocyte sedimentation rate, and methotrexate (MTX) treatment duration, the characteristics associated with RA-ILD were higher anti-CCP2 titers (P = 0.003) and + RF (P = 0.002). In multivariate linear regression, the variables associated with severity of ground-glass score were anti-CCP2 titers (P = 0.02) and with fibrosis score DD (P = 0.01), anti-CCP2 titers (P < 0.001), and MTX treatment duration (P < 0.001). Conclusions. Anti-CCP2 antibodies are markers of severity and extent of RA-ILD in HRCT. Further longitudinal studies are required to identify if higher anti-CCP2 titers are associated with worst prognosis in RA-ILD. PMID:26090479

  1. Anti-Cyclic Citrullinated Peptide Antibodies and Severity of Interstitial Lung Disease in Women with Rheumatoid Arthritis

    Directory of Open Access Journals (Sweden)

    Alberto Daniel Rocha-Muñoz

    2015-01-01

    Full Text Available Objective. To evaluate whether serum titers of second-generation anticyclic citrullinated peptide antibodies (anti-CCP2 are associated with the severity and extent of interstitial lung disease in rheumatoid arthritis (RA-ILD. Methods. In across-sectional study, 39 RA-ILD patients confirmed by high-resolution computed tomography (HRCT were compared with 42 RA without lung involvement (RA only. Characteristics related to RA-ILD were assessed in all of the patients and serum anti-CCP2 titers quantified. Results. Higher anti-CCP2 titers were found in RA-ILD compared with RA only (medians 77.9 versus 30.2 U/mL, P<0.001. In the logistic regression analysis after adjustment for age, disease duration (DD, smoke exposure, disease activity, functioning, erythrocyte sedimentation rate, and methotrexate (MTX treatment duration, the characteristics associated with RA-ILD were higher anti-CCP2 titers (P=0.003 and + RF (P=0.002. In multivariate linear regression, the variables associated with severity of ground-glass score were anti-CCP2 titers (P=0.02 and with fibrosis score DD (P=0.01, anti-CCP2 titers (P<0.001, and MTX treatment duration (P<0.001. Conclusions. Anti-CCP2 antibodies are markers of severity and extent of RA-ILD in HRCT. Further longitudinal studies are required to identify if higher anti-CCP2 titers are associated with worst prognosis in RA-ILD.

  2. Development of a high-titer retrovirus producer cell line capable of gene transfer into rhesus monkey hematopoietic stem cells

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    Bodine, D.M.; McDonagh, K.T.; Brandt, S.J.; Ney, P.A.; Agricola, B.; Byrne, E.; Nienhuis, A.W. (National Institutes of Health, Bethesda, MD (USA))

    1990-05-01

    Retroviral-mediated gene transfer into primitive hematopoietic cells has been difficult to achieve in large-animal models. The authors have developed an amphotropic producer clone that generates >10{sup 10} recombinant retroviral particles (colony-forming units) per ml of culture medium. Autologous rhesus monkey bone marrow cells were cocultured with either high or low titer producer clones for 4-6 days and reinfused into sublethally irradiated animals. The proviral genome was detected in blood and bone-marrow cells from all three animals reconstituted with cells cocultured with the high-titer producer cells. In contrast, three animals reconstituted with bone marrow cocultured with the low-titer producer clone exhibited no evidence of gene transfer.

  3. Pure red cell aplasia induced by anti-erythropoietin antibodies, well-controlled with tacrolimus.

    Science.gov (United States)

    Hashimoto, Koji; Harada, Makoto; Kamijo, Yuji

    2016-10-01

    Anti-erythropoietin (anti-EPO) antibody-related pure red cell aplasia (PRCA) is a rare but serious complication that can occur during the administration of erythropoiesis-stimulating agents. Treatment with the calcineurin inhibitor cyclosporine has shown benefits in patients with anti-EPO PRCA. The efficacy of tacrolimus, another calcineurin inhibitor, in patients with anti-EPO PRCA has not been determined. The present report is the first our knowledge to describe the successful treatment of a patient with anti-EPO PRCA using tacrolimus. A 73-year-old man was markedly anemic 8 months after starting epoetin beta treatment. He was diagnosed with anti-EPO PRCA. Cyclosporine was started, but he experienced side effects. He was switched from cyclosporine to tacrolimus. No side effects were observed, and his anti-EPO PRCA was improved 6 months later, despite the persistence of anti-EPO antibodies. Tacrolimus was continued until the disappearance of the antibodies. Following the cessation of tacrolimus, PRCA did not relapse. Antibody remained detectable at the time of clinical remission, indicating that immunosuppressive therapy should be continued while monitoring the antibody titer. When the antibody titer decreases to the negative range, cessation of the immunosuppressive therapy does not result in disease relapse.

  4. Antibodies against food antigens in patients with autistic spectrum disorders.

    Science.gov (United States)

    de Magistris, Laura; Picardi, Annarita; Siniscalco, Dario; Riccio, Maria Pia; Sapone, Anna; Cariello, Rita; Abbadessa, Salvatore; Medici, Nicola; Lammers, Karen M; Schiraldi, Chiara; Iardino, Patrizia; Marotta, Rosa; Tolone, Carlo; Fasano, Alessio; Pascotto, Antonio; Bravaccio, Carmela

    2013-01-01

    Immune system of some autistic patients could be abnormally triggered by gluten/casein assumption. The prevalence of antibodies to gliadin and milk proteins in autistic children with paired/impaired intestinal permeability and under dietary regimen either regular or restricted is reported. 162 ASDs and 44 healthy children were investigated for intestinal permeability, tissue-transglutaminase (tTG), anti-endomysium antibodies (EMA)-IgA, and total mucosal IgA to exclude celiac disease; HLA-DQ2/-DQ8 haplotypes; total systemic antibodies (IgA, IgG, and IgE); specific systemic antibodies: α-gliadin (AGA-IgA and IgG), deamidated-gliadin-peptide (DGP-IgA and IgG), total specific gliadin IgG (all fractions: α, β, γ, and ω), β-lactoglobulin IgG, α-lactalbumin IgG, casein IgG; and milk IgE, casein IgE, gluten IgE,-lactoglobulin IgE, and α-lactalbumin IgE. AGA-IgG and DPG-IgG titers resulted to be higher in ASDs compared to controls and are only partially influenced by diet regimen. Casein IgG titers resulted to be more frequently and significantly higher in ASDs than in controls. Intestinal permeability was increased in 25.6% of ASDs compared to 2.3% of healthy children. Systemic antibodies production was not influenced by paired/impaired intestinal permeability. Immune system of a subgroup of ASDs is triggered by gluten and casein; this could be related either to AGA, DPG, and Casein IgG elevated production or to impaired intestinal barrier function.

  5. Antibodies against Food Antigens in Patients with Autistic Spectrum Disorders

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    Laura de Magistris

    2013-01-01

    Full Text Available Purpose. Immune system of some autistic patients could be abnormally triggered by gluten/casein assumption. The prevalence of antibodies to gliadin and milk proteins in autistic children with paired/impaired intestinal permeability and under dietary regimen either regular or restricted is reported. Methods. 162 ASDs and 44 healthy children were investigated for intestinal permeability, tissue-transglutaminase (tTG, anti-endomysium antibodies (EMA-IgA, and total mucosal IgA to exclude celiac disease; HLA-DQ2/-DQ8 haplotypes; total systemic antibodies (IgA, IgG, and IgE; specific systemic antibodies: α-gliadin (AGA-IgA and IgG, deamidated–gliadin-peptide (DGP-IgA and IgG, total specific gliadin IgG (all fractions: α, β, γ, and ω, β-lactoglobulin IgG, α-lactalbumin IgG, casein IgG; and milk IgE, casein IgE, gluten IgE, -lactoglobulin IgE, and α-lactalbumin IgE. Results. AGA-IgG and DPG-IgG titers resulted to be higher in ASDs compared to controls and are only partially influenced by diet regimen. Casein IgG titers resulted to be more frequently and significantly higher in ASDs than in controls. Intestinal permeability was increased in 25.6% of ASDs compared to 2.3% of healthy children. Systemic antibodies production was not influenced by paired/impaired intestinal permeability. Conclusions. Immune system of a subgroup of ASDs is triggered by gluten and casein; this could be related either to AGA, DPG, and Casein IgG elevated production or to impaired intestinal barrier function.

  6. Acetylcholine receptor antibody

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/article/003576.htm Acetylcholine receptor antibody To use the sharing features on this page, please enable JavaScript. Acetylcholine receptor antibody is a protein found in the blood ...

  7. Antinuclear antibody panel

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    ... page: //medlineplus.gov/ency/article/003535.htm Antinuclear antibody panel To use the sharing features on this page, please enable JavaScript. The antinuclear antibody panel is a blood test that looks at ...

  8. Platelet antibodies blood test

    Science.gov (United States)

    This blood test shows if you have antibodies against platelets in your blood. Platelets are a part of the blood ... Chernecky CC, Berger BJ. Platelet antibody - blood. In: Chernecky ... caused by platelet destruction, hypersplenism, or hemodilution. ...

  9. New principle for the simultaneous detection of total and immunoglobulin M antibodies applied to the measurement of antibody to hepatitis B core antigen.

    Science.gov (United States)

    Angarano, G; Monno, L; Santantonio, T A; Pastore, G

    1984-06-01

    A new test principle for the simultaneous detection of total approximate titers and immunoglobulin M antibodies has been developed and applied to the detection of antibody to hepatitis B core antigen. The method is based on the combination of a competition radioimmunoassay, for the determination of total antibody titer, with an indirect enzyme-linked immunosorbent assay for the determination of single class antibodies. The interference of the rheumatoid factor was avoided by including heat-aggregated immunoglobulin G in the dilution buffer. The specificity, sensitivity, and clinical application of the test are discussed. The results presented suggest that the simultaneous detection of total and immunoglobulin M antibody to hepatitis B core antigen might be helpful in the differentiation between previous and recent or ongoing hepatitis B infection, as well as in the differential diagnosis of acute hepatitis, in monitoring viral activity in chronic infections, and in helping to differentiate acute from chronic infections. The test principle appears applicable in the accurate diagnosis of other infectious diseases by a single test on only one serum sample.

  10. Bickerstaff's encephalitis and Miller Fisher syndrome associated with voltage-gated potassium channel and novel anti-neuronal antibodies.

    Science.gov (United States)

    Tüzün, E; Kürtüncü, M; Lang, B; Içöz, S; Akman-Demir, G; Eraksoy, M; Vincent, A

    2010-10-01

    GQ1b antibody (GQ1b-Ab) is detected in approximately two-thirds of sera of patients with Bickerstaffs encephalitis (BE). Whilst some of the remaining patients have antibodies to other gangliosides, many patients with BE are reported to be seronegative. Voltage-gated potassium channel antibody (VGKC-Ab) at high titer was detected during the diagnostic work-up of one patient with BE. Sera of an additional patient with BE and nine patients with Miller Fisher syndrome (MF) (all GQ1b-Ab positive) were investigated for VGKC-Ab and other anti-neuronal antibodies by radioimmunoprecipitation using 125I-dendrotoxin-VGKC and immunohistochemistry, respectively. Two patients with MF exhibited moderate titer VGKC-Abs. Regardless of positivity for VGKC or GQ1b antibodies, serum IgG of all patients with BE and MF reacted with the molecular layer and Purkinje cells of the cerebellum in a distinctive pattern. Voltage-gated potassium channel antibodies might be involved in some cases of BE or MF. The common staining pattern despite different antibody results suggests that there might be other, as yet unidentified, antibodies associated with BE and MF.

  11. Acute Cerebellar Ataxia Associated with Anti-glutamic Acid Decarboxylase Antibodies Mimicking Miller Fisher Syndrome.

    Science.gov (United States)

    Nakamura, Yoshitsugu; Nakajima, Hideto; Hosokawa, Takafumi; Yamane, Kazushi; Ishida, Shimon; Kimura, Fumiharu

    2018-01-15

    We herein report the case of a 53-year-old man with cerebellar ataxia with anti-glutamic acid decarboxylase antibody (GAD-Ab) who mimicked Miller Fisher syndrome (MFS). He developed ophthalmoplegia, diplopia, and gait ataxia for one week. The serum and cerebrospinal fluid GAD-Ab titers were greatly increased, and the GAD-Ab index suggesting intrathecal antibody synthesis was elevated, while GQ1b-Ab was negative. After steroid pulse therapy and following prednisolone, his symptoms dramatically improved over the course of 11 months with the simultaneous decline of GAD-Ab titers. This case indicates that cerebellar ataxia with GAD-Ab can present with acute neurological findings mimicking MFS, and that steroid therapy has an excellent therapeutic effect.

  12. West Nile and st. Louis encephalitis viruses antibodies surveillance in captive and free-ranging birds of prey from Argentina.

    Science.gov (United States)

    Quaglia, Agustin I; Diaz, Luis A; Argibay, Hernan; Contigiani, Marta S; Saggese, Miguel D

    2014-12-01

    We evaluated the prevalence of WNV and SLEV neutralizing antibodies in captive and free-ranging raptors from Argentina by plaque-reduction neutralization test. Eighty plasma samples from 12 species were analyzed. Only one captive adult Crowned Eagle (Harpyhaliaetus coronatus) was WNV seropositive (prevalence: 1.25%; antibody titer of 1:80). Two captive Crowned Eagles were SLEV seropositive (prevalence: 2.50%; antibody titers: 1:80 and 1:40).These findings expand the geographic distribution of WNV and SLEV and confirm their activity in central and northeastern Argentina. West Nile virus activity in Argentina may represent a potential threat to Crowned Eagles and other endangered raptors in this country.

  13. Heavy chain only antibodies

    DEFF Research Database (Denmark)

    Moghimi, Seyed Moein; Rahbarizadeh, Fatemeh; Ahmadvand, Davoud

    2013-01-01

    Unlike conventional antibodies, heavy chain only antibodies derived from camel contain a single variable domain (VHH) and two constant domains (CH2 and CH3). Cloned and isolated VHHs possess unique properties that enable them to excel conventional therapeutic antibodies and their smaller antigen...

  14. Antibodies Against Melanin

    African Journals Online (AJOL)

    1973-01-06

    Jan 6, 1973 ... This study reports on unsuccessful attempts to produce antibodies against melanoprotein in rabbits. Available evidence suggests antibodies against melanocytes in the aetiology of vitiligo, but there is no convincing evidence for antibodies against melanin per se. It is suggested that the demonstration of ...

  15. Antineutrophil Cytoplasmic Antibodies, Autoimmune Neutropenia, and Vasculitis

    Science.gov (United States)

    Grayson, Peter C.; Sloan, J. Mark; Niles, John L.; Monach, Paul A.; Merkel, Peter A.

    2011-01-01

    Objectives Reports of an association between antineutrophil cytoplasmic antibodies (ANCA) and autoimmune neutropenia have rarely included cases of proven vasculitis. A case of ANCA-associated vasculitis (AAV) with recurrent neutropenia is described and relevant literature on the association between ANCA, neutropenia, and vasculitis is reviewed. Methods Longitudinal clinical assessments and laboratory findings are described in a patient with AAV and recurrent episodes of profound neutropenia from December 2008 – October 2010. A PubMed database search of the medical literature was performed for papers published from 1960 through October 2010 to identify all reported cases of ANCA and neutropenia. Results A 49 year-old man developed recurrent neutropenia, periodic fevers, arthritis, biopsy-proven cutaneous vasculitis, sensorineural hearing loss, epididymitis, and positive tests for ANCA with specificity for antibodies to both proteinase 3 and myeloperoxidase. Antineutrophil membrane antibodies were detected during an acute neutropenic phase and were not detectable in a post-recovery sample, whereas ANCA titers did not seem to correlate with neutropenia. An association between ANCA and neutropenia has been reported in 74 cases from 24 studies in the context of drug/toxin exposure, underlying autoimmune disease, or chronic neutropenia without underlying autoimmune disease. In these cases, the presence of atypical ANCA patterns and other antibodies were common; however, vasculitis was uncommon and when it occurred was usually limited to the skin and in cases of underlying toxin exposure. Conclusions ANCA is associated with autoimmune neutropenia, but systemic vasculitis rarely occurs in association with ANCA and neutropenia. The interaction between neutrophils and ANCA may provide insight into understanding both autoimmune neutropenia and AAV. PMID:21507463

  16. Titration of serum anti-ganglioside antibodies in patients with chronic medular injury previous to treatment with GM1 ganglioside

    OpenAIRE

    Barros Filho Tarcísio Eloy Pessoa; Silva Filho Ciro da

    2003-01-01

    Anti-ganglioside serum titers were evaluated by ELISA in 150 patients with complete spinal cord lesion for 6 to 12 months (IgG monosialo GM1, IgM monosialo GM1, IgG asialo GM1, IgM asialo GM1, IgG disialo GD1b e IgM disialo GD1b) prior to treatment with GM1 100 mg/day i.m. Only 4 patients showed positive titers for anti-asialo-GM1 (IgM) antibodies . All patients were clinically examined during and after treatment. No important side effects were observed with GM1 therapy. These results suggest...

  17. Elevated serum anti-phosphatidylcholine IgG antibodies in patients with influenza vaccination-associated optic neuritis.

    Science.gov (United States)

    Korematsu, Seigo; Miyahara, Hiroaki; Kakita, Akiyoshi; Izumi, Tatsuro

    2014-11-12

    Because the optic nerve is mainly comprised from phospholipids such as phosphatidylcholine, the association between optic neuritis, anti-phospholipids antibodies and vaccination was examined. Two female pediatric patients suddenly presented bilateral optic neuritis after administration of trivalent inactivated influenza vaccine. These two patients and another 11 patients with central nervous system demyelinating diseases were examined these anti-phospholipids antibodies. And immune histopathology was examined using serum derived from a patient with optic neuritis. High serum titer of anti-phosphatidylcholine antibody levels were detected during acute phase in patients with optic neuritis. The patient's serum IgG antibodies were found to have stained the capillary endotheliums in the preserved autopsied optic nerve. Patients with optic neuritis had significantly elevated serum levels of anti-phosphatidylcholine antibody in comparison to the other patients without optic neuritis. Anti-phosphatidylcholine antibodies may be one of the causes of optic neuritis. Copyright © 2014 Elsevier Ltd. All rights reserved.

  18. Does vaccination ensure protection? Assessing diphtheria and tetanus antibody levels in a population of healthy children

    Science.gov (United States)

    Gowin, Ewelina; Wysocki, Jacek; Kałużna, Ewelina; Świątek-Kościelna, Bogna; Wysocka-Leszczyńska, Joanna; Michalak, Michał; Januszkiewicz-Lewandowska, Danuta

    2016-01-01

    Abstract Vaccination effectiveness is proven when the disease does not develop after a patient is exposed to the pathogen. In the case of rare diseases, vaccination effectiveness is assessed by monitoring specific antibody levels in the population. Such recurrent analyses allow the evaluation of vaccination programs. The primary schedule of diphtheria and tetanus vaccinations is similar in various countries, with differences mainly in the number and timing of booster doses. The aim of the study was to assess diphtheria and tetanus antibody concentrations in a population of healthy children. Diphtheria and tetanus antibody levels were analyzed in a group of 324 children aged 18 to 180 months. All children were vaccinated in accordance with the Polish vaccination schedule. Specific antibody concentrations greater than 0.1 IU/mL were considered protective against tetanus or diphtheria. Levels above 1.0 were considered to ensure long-term protection. Protective levels of diphtheria antibodies were found in 229 patients (70.46%), and of tetanus in 306 patients (94.15%). Statistically significant differences were found in tetanus antibody levels in different age groups. Mean concentrations and the percentage of children with high tetanus antibody titers increased with age. No similar correlation was found for diphtheria antibodies. High diphtheria antibody levels co-occurred in 72% of the children with high tetanus antibody levels; 95% of the children with low tetanus antibody levels had low levels of diphtheria antibodies. The percentage of children with protective diphtheria antibody levels is lower than that in the case of tetanus antibodies, both in Poland and abroad, but the high proportion of children without diphtheria protection in Poland is an exception. This is all the more puzzling when taking into account that Polish children are administered a total of 5 doses containing a high concentration of diphtheria toxoid, at intervals shorter than 5 years. The

  19. Interlaboratory testing of porcine sera for antibodies to porcine circovirus type 2

    DEFF Research Database (Denmark)

    McNair, I.; Marshall, M.; McNeilly, F.

    2004-01-01

    A panel of 20 porcine sera was distributed to 5 laboratories across Europe and Canada. Each center was requested to test the sera for the presence of porcine circovirus type 2 antibodies using the routine assays, indirect immunofluorescence assay (IFA) and indirect immunoperoxidase monolayer assa...... than did IFA, and paraformaldehyde gave higher titers than did acetone or ethyl alcohol. This report highlights the need for standardized procedures and biologicals for this virus....

  20. Limited Neutralizing Antibody Specificities Drive Neutralization Escape in Early HIV-1 Subtype C Infection

    OpenAIRE

    Rong Rong; Bing Li; Lynch, Rebecca M.; Haaland, Richard E.; Murphy, Megan K.; Joseph Mulenga; Allen, Susan A.; Abraham Pinter; Shaw, George M.; Eric Hunter; Robinson, James E.; Gnanakaran, S.; Derdeyn, Cynthia A.

    2009-01-01

    One aim for an HIV vaccine is to elicit neutralizing antibodies (Nab) that can limit replication of genetically diverse viruses and prevent establishment of a new infection. Thus, identifying the strengths and weaknesses of Nab during the early stages of natural infection could prove useful in achieving this goal. Here we demonstrate that viral escape readily occurred despite the development of high titer autologous Nab in two subjects with acute/early subtype C infection. To provide a detail...

  1. Antibody-Mediated Neutralization of Pertussis Toxin-Induced Mitogenicity of Human Peripheral Blood Mononuclear Cells

    OpenAIRE

    Scott H Millen; Bernstein, David I.; Connelly, Beverly; Ward, Joel I.; Chang, Swei-Ju; Weiss, Alison A.

    2004-01-01

    Antibody-mediated neutralization of pertussis toxin-induced proliferation of human peripheral blood mononuclear cells (PBMC) was assessed using alamarBlue and compared with results from the Chinese hamster ovary (CHO) cell assay using sera from vaccinated adults and convalescent children. Neutralization values for the CHO assay were similar for vaccinated and convalescent subjects; however. the convalescent group had higher titers in the PBMC assay. Results for pertussis toxin neutralization ...

  2. Anti-ganglioside antibodies induced in chickens by an alum-adsorbed anti-idiotype antibody targeting NeuGcGM3.

    Directory of Open Access Journals (Sweden)

    Marcelo David Guthmann

    2013-01-01

    Full Text Available Racotumomab is a murine anti-idiotype cancer vaccine targeting NeuGcGM3 on melanoma, breast and lung cancer. In order to characterize the immunogenicity of alum-adsorbed racotumomab in a non-clinical setting, Leghorn chickens were immunized in dose levels ranging from 25 µg to 1600 µg. Racotumomab was administered subcutaneously in the birds’ neck with three identical boosters and serum samples were collected before, during and after the immunization schedule. A strong antibody response was obtained across the evaluated dose range, confirming the immunogenicity of racotumomab even at dose levels as low as 25 µg. As previously observed when using Freund´s adjuvant, alum-adsorbed racotumomab induced an idiotype-specific response in all the immunized birds and ganglioside-specific antibodies in 60-100% of the animals. In contrast to the rapid induction anti-idiotype response, detection of ganglioside-specific antibodies in responsive animals may require repeated boosting. Kinetics of anti-NeuGcGM3 antibody titers showed a slight decline two weeks after each booster, arguing in favor of repeated immunizations in order to maintain antibody titer.Interestingly, the intensity of the anti-NeuGcGM3 response paralleled that of anti-mucin antibodies and anti-tumor antibodies, suggesting that the in vitro detection of anti-ganglioside antibodies might be a surrogate for an in vivo activity of racotumomab. Taken together, these results suggest that Leghorn chicken immunization might become the means to test the biological activity of racotumomab intended for clinical use.

  3. Development of subtype-specific and heterosubtypic antibodies to the influenza A virus hemagglutinin after primary infection in children.

    OpenAIRE

    Burlington, D B; Wright, P F; van Wyke, K L; Phelan, M A; Mayner, R E; Murphy, B R

    1985-01-01

    Children undergoing primary infection with an H1N1 or H3N2 influenza A virus developed subtype-specific hemagglutination inhibition antibodies and enzyme-linked immunosorbent assay antibodies to purified hemagglutinin (HA) of the infecting virus subtype. They also developed lower titered ELISA antibodies to the noninfecting H1 or H3 HA and to H8 (an avian strain) HA. Thus, after primary infection with an influenza A virus, children develop enzyme-linked immunosorbent assay, but not hemaggluti...

  4. Design of a trans protease lentiviral packaging system that produces high titer virus

    Directory of Open Access Journals (Sweden)

    Leboulch Philippe

    2007-12-01

    Full Text Available Abstract Background The structural and enzymatic proteins of the human immunodeficiency virus (HIV are initially generated as two long polyproteins encoded from overlapping reading frames, one producing the structural proteins (Gag and the second producing both structural and enzymatic proteins (Gag-Pol. The Gag to Gag-Pol ratio is critical for the proper assembly and maturation of viral particles. To minimize the risk of producing a replication competent lentivirus (RCL, we developed a "super-split" lentiviral packaging system in which Gag was separated from Pol with minimal loss of transducibility by supplying protease (PR in trans independently of both Gag and Pol. Results In developing this "super-split" packaging system, we incorporated several new safety features that include removing the Gag/Gag-Pol frameshift, splitting the Gag, PR, and reverse transcriptase/integrase (RT/IN functions onto separate plasmids, and greatly reducing the nucleotide sequence overlap between vector and Gag and between Gag and Pol. As part of the construction of this novel system, we used a truncated form of the accessory protein Vpr, which binds the P6 region of Gag, as a vehicle to deliver both PR and RT/IN as fusion proteins to the site of viral assembly and budding. We also replaced wt PR with a slightly less active T26S PR mutant in an effort to prevent premature processing and cytoxicity associated with wt PR. This novel "super-split" packaging system yielded lentiviral titers comparable to those generated by conventional lentiviral packaging where Gag-Pol is supplied intact (1.0 × 106 TU/ml, unconcentrated. Conclusion Here, we were able to create a true "split-function" lentiviral packaging system that has the potential to be used for gene therapy applications. This novel system incorporates many new safety features while maintaining high titers. In addition, because PR is supplied in trans, this unique system may also provide opportunities to examine

  5. Serologic survey for antibodies against three genotypes of bovine parainfluenza 3 virus in unvaccinated ungulates in Alabama.

    Science.gov (United States)

    Newcomer, Benjamin W; Neill, John D; Galik, Patricia K; Riddell, Kay P; Zhang, Yijing; Passler, Thomas; Velayudhan, Binu T; Walz, Paul H

    2017-02-01

    OBJECTIVE To determine titers of serum antibodies against 3 genotypes of bovine parainfluenza 3 virus (BPI3V) in unvaccinated ungulates in Alabama. ANIMALS 62 cattle, goats, and New World camelids from 5 distinct herds and 21 captured white-tailed deer. PROCEDURES Serum samples were obtained from all animals for determination of anti-BPI3V antibody titers, which were measured by virus neutralization assays that used indicator (reference) viruses from each of the 3 BPI3V genotypes (BPI3V-A, BPI3V-B, and BPI3V-C). The reference strains were recent clinical isolates from US cattle. Each sample was assayed in triplicate for each genotype. Animals with a mean antibody titer ≤ 2 for a particular genotype were considered seronegative for that genotype. RESULTS Animals seropositive for antibodies against BPI3V were identified in 2 of 3 groups of cattle and the group of New World camelids. The geometric mean antibody titer against BPI3V-B was significantly greater than that for BPI3V-A and BPI3V-C in all 3 groups. All goats, captive white-tailed deer, and cattle in the third cattle group were seronegative for all 3 genotypes of the virus. CONCLUSIONS AND CLINICAL RELEVANCE Results indicated that BPI3V-A may no longer be the predominant genotype circulating among ungulates in Alabama. This may be clinically relevant because BPI3V is frequently involved in the pathogenesis of bovine respiratory disease complex, current vaccines contain antigens against BPI3V-A only, and the extent of cross-protection among antibodies against the various BPI3V genotypes is unknown.

  6. A high seroprevalence of antibodies to pertussis toxin among Japanese adults: Qualitative and quantitative analyses.

    Directory of Open Access Journals (Sweden)

    Takumi Moriuchi

    Full Text Available In 2013, national serosurveillance detected a high seroprevalence of antibodies to pertussis toxin (PT from Bordetella pertussis among Japanese adults. Thus, we aimed to determine the cause(s of this high seroprevalence, and analyzed the titers of antibodies to PT and filamentous hemagglutinin (FHA among adults (35-44 years old, young children (4-7 years old, and older children (10-14 years old. Our quantitative analyses revealed that adults had higher seroprevalences of anti-PT IgG and PT-neutralizing antibodies, and similar titers of anti-FHA IgG, compared to the young and older children. Positive correlations were observed between the titers of PT-neutralizing antibodies and anti-PT IgG in all age groups (rs values of 0.326-0.522, although the correlation tended to decrease with age. The ratio of PT-neutralizing antibodies to anti-PT IgG was significantly different when we compared the serum and purified IgG fractions among adults (p = 0.016, although this result was not observed among young and older children. Thus, it appears that some adults had non-IgG immunoglobulins to PT. Our analyses also revealed that adults had high-avidity anti-PT IgG (avidity index: 63.5%, similar results were observed among the children; however, the adults had lower-avidity anti-FHA IgG (37.9%, p < 0.05. It is possible that low-avidity anti-FHA IgG is related to infection with other respiratory pathogens (e.g., Bordetella parapertussis, Haemophilus influenzae, or Mycoplasma pneumoniae, which produces antibodies to FHA-like proteins. Our observations suggest that these adults had been infected with B. pertussis and other pathogen(s during their adulthood.

  7. Papillomavirus pseudovirions packaged with the L2 gene induce cross-neutralizing antibodies

    Directory of Open Access Journals (Sweden)

    Duarte-Forero Diego F

    2010-03-01

    Full Text Available Abstract Background Current vaccines against HPVs are constituted of L1 protein self-assembled into virus-like particles (VLPs and they have been shown to protect against natural HPV16 and HPV18 infections and associated lesions. In addition, limited cross-protection has been observed against closely related types. Immunization with L2 protein in animal models has been shown to provide cross-protection against distant papillomavirus types, suggesting that the L2 protein contains cross-neutralizing epitopes. However, vaccination with L2 protein or L2 peptides does not induce high titers of anti-L2 antibodies. In order to develop a vaccine with the potential to protect against other high-risk HPV types, we have produced HPV58 pseudovirions encoding the HPV31 L2 protein and compared their capacity to induce cross-neutralizing antibodies with that of HPV L1 and HPV L1/L2 VLPs. Methods The titers of neutralizing antibodies against HPV16, HPV18, HPV31 and HPV58 induced in Balb/c mice were compared after immunization with L2-containing vaccines. Results Low titers of cross-neutralizing antibodies were detected in mice when immunized with L1/L2 VLPs, and the highest levels of cross-neutralizing antibodies were observed in mice immunized with HPV 58 L1/L2 pseudovirions encoding the HPV 31 L2 protein. Conclusions The results obtained indicate that high levels of cross-neutralizing antibodies are only observed after immunization with pseudovirions encoding the L2 protein. HPV pseudovirions thus represent a possible new strategy for the generation of a broad-spectrum vaccine to protect against high-risk HPVs and associated neoplasia.

  8. Correlation between the Amount of Anti-D Antibodies and IgG Subclasses with Severity of Haemolytic Disease of Foetus and Newborn

    Directory of Open Access Journals (Sweden)

    Emilija Velkova

    2015-05-01

    CONCLUSIONS: The titers of the pregnant women serum those are lower than 32 and those higher than 1000 can well predict HDFN. The titers of anti-D antibodies between 64 and 512 have no exact predictive value. IgG1 and IgG3 subclasses of anti-D have no predictive value by themselves, and cannot foresee the outcome of HDFN. The research study results suggest that IgG1 and IgG3 should be included in a multi – parameter protocol for evaluation of the HDFN intensity. They can give a real assessment of the expected HDFN intensity in combination with the titer hight and the significance of the antibodies.

  9. Decline of hepatitis B antibody level in vaccinated 5-7 year-old children

    Directory of Open Access Journals (Sweden)

    Mitra Safari

    2010-06-01

    Full Text Available Background: Vaccination is the best way to prevent hepatitis B infection. The efficacy of hepatitis B vaccine and duration of protection after vaccination in infants is unknown. The aim of this study was to evaluate the immunity level of school age children against HBV in order to determine the decline of hepatitis B antibody level during the childhood period.Materials and Methods: This cross-sectional research was performed on 729, 5-7 year-old children in Kohgiloyeh& Boyerahmad Province who had been vaccinated at birth. Patients selected by multiple stage sampling method. While interviewing parents the questionnaire were completed. The laboratory rep[ort was attached to the questionnaire. After confirming the correct date of vaccination time, parents were asked for an informed consent. From each patient 3ml blood sample were taken and hepatitis B surface antibody (HBs-Ab and hepatitis B surface antigen (HBs-Ag were determined by ELISA method. Chi-squared and t-tests were used to analyze obtained data by using SPSS-15 software.Results: HBs-Ag was negative in all patients. 84.4% of subjects were immune against HBV (had protective antibody titer. The mean antibody titer was 308.9±230.5 IU/ml with range of 10.6–1175 IU/ml. 15.6% of samples had non protective antibody titer and mean antibody titer was 4.97 ±3. 5 IU/ml. Anti-HBsAb titers were related to the age and residency of children. The immunity level decreased with increasing age. No statistically significant differences could be found between two sexes. Conclusion: Based on this stud, the immunity persistency rate in this age group was suitable compared to other studies. Unfortunately, there is about 20% of non-immune children to HBV infection in this susceptible age with a high risk of contamination and affliction. Because of seriousness of HBV infection proper immunization strategy should be considered in this era by health care authorities

  10. Plasmablast-derived polyclonal antibody response after influenza vaccination.

    Science.gov (United States)

    He, Xiao-Song; Sasaki, Sanae; Narvaez, Carlos F; Zhang, Caiqiu; Liu, Hui; Woo, Jennifer C; Kemble, George W; Dekker, Cornelia L; Davis, Mark M; Greenberg, Harry B

    2011-02-28

    Conventional measurement of antibody responses to vaccines largely relies on serum antibodies, which are primarily produced by bone marrow plasma cells and may not represent the entire vaccine-induced B cell repertoire, including important functional components such as those targeted to mucosal sites. After immunization or infection, activated B cells differentiate into plasmablasts in local lymphoid organs, then traffic through circulation to the target sites where they further develop into plasma cells. On day 7 after influenza vaccination, a burst of plasmablasts, highly enriched for vaccine-specific antibody secreting cells, appears in the peripheral blood. This provides a unique window to the overall B cell response to the vaccine, without interference of pre-existing cross-reactive serum antibody. In this study we isolated B cells from volunteers on day 7 after immunization with the inactivated influenza vaccine and cultured them ex vivo to collect plasmablast-derived polyclonal antibodies (PPAb). The PPAb contained secreted IgG and IgA, which was approximately 0.2ng per antibody secreting cell. Influenza-specific IgG and IgA binding activity was detected in PPAb at dilutions up to 10(5) by ELISA. The ratio of the titers of influenza-specific IgA to IgG by ELISA was 4-fold higher in PPAb than in day 28 post-vaccination sera, suggesting that vaccine-induced IgA is enriched in PPAb compared to sera. Functional activity was also detected in PPAb as determined by microneutralization and hemagglutination inhibition assays. In addition to bulk B cell cultures, we also cultured plasmablast subsets sorted by cell surface markers to generate PPAb. These results suggest that PPAb better reflects the mucosal IgA response than serum samples. Since PPAb are exclusively produced by recently activated B cells, it allows assessing vaccine-induced antibody response without interference from pre-existing cross-reactive serum antibodies and permits an assessment of antibody

  11. The Prevalence of Antinuclear Antibodies in Patients with Sarcoidosis

    Directory of Open Access Journals (Sweden)

    Senol Kobak

    2014-01-01

    Full Text Available Introduction. Sarcoidosis, which is a chronic inflammatory granulomatous disease, can mimic different rheumatologic diseases including connective tissue diseases. Antinuclear antibodies are the markers used for connective tissue diseases. Aim. To determine antinuclear antibody frequency and any possible correlation with clinical and laboratory data in sarcoidosis patients. Material and Method. Forty-two sarcoidosis patients, 45 rheumatoid arthritis patients, and 45 healthy volunteers who were followed up in rheumatology outpatient clinic were included in this study. Demographic, clinical, serological, and radiological data of all patients were recorded. Antinuclear antibodies were determined with indirect immunofluorescent method and 1/100 titration was accepted as positive. The cases that were ANA positive were evaluated with immunoblot method. Results. Average age of the 42 patients (10 males with sarcoidosis was 45.2 (20–70 years, and average disease duration was 3.5 years. ANA positivity was detected in 12 (28.5% patients with sarcoidosis (1/100 in 10 patients, 1/320 in two patients, in 19 of RA patients (42.2%, and in two of healthy volunteers in low titer (P<0.001. In the subgroup analysis made by immunblot test, one patient had anticentromere antibody, one had anti-Ro antibody, one had anti-Scl-70 antibody, one had anti-dsDNA antibody, and eight patients were negative. The two patients who had anticentromere and anti-Scl-70 antibodies had also Sjögren’s syndrome and scleroderma diagnosis, respectively. Discussion. The prevalence of ANA in patients with sarcoidosis was found to be significantly higher than healthy control group and lower than RA patients. This result shows that ANA may have an important role in the pathogenesis of sarcoidosis and also could be important in revealing the overlap syndromes of sarcoidosis-connective tissue diseases. Further studies with larger series are necessary in this subject.

  12. Antibody screening in multitransfused patients: a prerequisite before each transfusion.

    Science.gov (United States)

    Lamba, Divjot S; Mittal, Kshitija; Sood, Tanvi; Bedi, Ravneet Kaur; Kaur, Paramjit; Kaur, Gagandeep

    2014-10-01

    Life-long red blood cell (RBC) transfusions remain the main treatment for severe thalassemia. We hereby report a case of anti S and anti Lu(a) in a β-thalassemia major patient detected incidentally on antibody screening. The patient was a known case of β-thalassemia major and was on regular blood transfusion every 3 weeks from the institute from the age of 6 months. Subsequently, on one occasion, patient's crossmatch was compatible despite positive antibody screen using microcolumn gel technique. Autocontrol and direct antiglobulin test were negative on microcolumn gel. Anti S and anti Lu(a) antibodies were identified. Blood unit found compatible was negative for S and Lu(a) antigens. Antibody titers were 1:1 for both anti S and anti Lu(a) in AHG phase using tube technique and antibodies were of IgG type. Blood unit was transfused uneventfully to the patient. Donors were traced back (last three donations) and called for repeat blood sample testing for S and Lu(a) antigen. Two out of three donors were found to be S antigen positive and one out of these two was Lu(a) antigen positive. Anti S and anti Lu(a) antibodies were again identified on patient's subsequent visit for transfusion. The present case re-emphasize the importance of antibody screening at each visit in earlier detection of antibodies in multi transfused patients. Encouraging patients to receive transfusion from one center and dedicating donors could reduce alloimmunization rate but larger studies are required. Copyright © 2014 Elsevier Ltd. All rights reserved.

  13. Mixed Adjuvant Formulations Reveal a New Combination That Elicit Antibody Response Comparable to Freund's Adjuvants

    Science.gov (United States)

    Lai, Rachel P. J.; Seaman, Michael S.; Tonks, Paul; Wegmann, Frank; Seilly, David J.; Frost, Simon D. W.; LaBranche, Celia C.; Montefiori, David C.; Dey, Antu K.; Srivastava, Indresh K.; Sattentau, Quentin; Barnett, Susan W.; Heeney, Jonathan L.

    2012-01-01

    Adjuvant formulations capable of inducing high titer and high affinity antibody responses would provide a major advance in the development of vaccines to viral infections such as HIV-1. Although oil-in-water emulsions, such as Freund's adjuvant (FCA/FIA), are known to be potent, their toxicity and reactogenicity make them unacceptable for human use. Here, we explored different adjuvants and compared their ability to elicit antibody responses to FCA/FIA. Recombinant soluble trimeric HIV-1 gp140 antigen was formulated in different adjuvants, including FCA/FIA, Carbopol-971P, Carbopol-974P and the licensed adjuvant MF59, or combinations of MF59 and Carbopol. The antigen-adjuvant formulation was administered in a prime-boost regimen into rabbits, and elicitation of antigen binding and neutralizing antibodies (nAbs) was evaluated. When used individually, only FCA/FIA elicited significantly higher titer of nAbs than the control group (gp140 in PBS (pCarbopol-971P and MF59 induced potent adjuvant activity with significantly higher titer nAbs than FCA/FIA (pCarbopol-971P and MF59 is unusually potent for eliciting nAbs to a variety of HIV-1 nAb epitopes. PMID:22509385

  14. Mixed adjuvant formulations reveal a new combination that elicit antibody response comparable to Freund's adjuvants.

    Science.gov (United States)

    Lai, Rachel P J; Seaman, Michael S; Tonks, Paul; Wegmann, Frank; Seilly, David J; Frost, Simon D W; LaBranche, Celia C; Montefiori, David C; Dey, Antu K; Srivastava, Indresh K; Sattentau, Quentin; Barnett, Susan W; Heeney, Jonathan L

    2012-01-01

    Adjuvant formulations capable of inducing high titer and high affinity antibody responses would provide a major advance in the development of vaccines to viral infections such as HIV-1. Although oil-in-water emulsions, such as Freund's adjuvant (FCA/FIA), are known to be potent, their toxicity and reactogenicity make them unacceptable for human use. Here, we explored different adjuvants and compared their ability to elicit antibody responses to FCA/FIA. Recombinant soluble trimeric HIV-1 gp140 antigen was formulated in different adjuvants, including FCA/FIA, Carbopol-971P, Carbopol-974P and the licensed adjuvant MF59, or combinations of MF59 and Carbopol. The antigen-adjuvant formulation was administered in a prime-boost regimen into rabbits, and elicitation of antigen binding and neutralizing antibodies (nAbs) was evaluated. When used individually, only FCA/FIA elicited significantly higher titer of nAbs than the control group (gp140 in PBS (pCarbopol-971P and MF59 induced potent adjuvant activity with significantly higher titer nAbs than FCA/FIA (pCarbopol-971P and MF59 is unusually potent for eliciting nAbs to a variety of HIV-1 nAb epitopes.

  15. Case Study: an accelerated 8-day monoclonal antibody production process based on high seeding densities.

    Science.gov (United States)

    Padawer, Ishai; Ling, Wai Lam W; Bai, Yunling

    2013-01-01

    This study describes the development work to shorten the monoclonal antibody (mAb) production time in CHO cell cultures from 14 days to 8 days without impacting mAb titer or product quality. The proposed process increases cell inoculation densities up to 25× higher than a typical seeding density in the final production bioreactor, with the implementation of an ATF™ perfusion system in the N - 1 stage. Similar antibody titer and N-glycosylation profiles were reached in 8 days using the 25× seed condition, as in 14 days using the 1× seed condition. Acidic variants in the 25× seed condition were 12-20% lower than the 1× seed condition. These results indicate that an accelerated 8-day antibody production process utilizing a 25× seeding strategy has the potential of achieving similar product quality and titer as the 1× seeding condition in a 14-day production process. © 2013 American Institute of Chemical Engineers.

  16. Multiple pathways of escape from HIV broadly cross-neutralizing V2-dependent antibodies.

    Science.gov (United States)

    Moore, Penny L; Sheward, Daniel; Nonyane, Molati; Ranchobe, Nthabeleng; Hermanus, Tandile; Gray, Elin S; Abdool Karim, Salim S; Williamson, Carolyn; Morris, Lynn

    2013-05-01

    Broadly cross-neutralizing (BCN) antibodies are likely to be critical for an effective HIV vaccine. However, the ontogeny of such antibodies and their relationship with autologous viral evolution is unclear. Here, we characterized viral evolution in CAP256, a subtype C-infected individual who developed potent BCN antibodies targeting positions R166 and K169 in the V2 region. CAP256 was superinfected at 3 months postinfection with a virus that was highly sensitive to BCN V2-dependent monoclonal antibodies. The autologous neutralizing response in CAP256 was directed at V1V2, reaching extremely high titers (>1:40,000) against the superinfecting virus at 42 weeks, just 11 weeks prior to the development of the BCN response targeting the same region. Recombination between the primary and superinfecting viruses, especially in V2 and gp41, resulted in two distinct lineages by 4 years postinfection. Although neutralization of some CAP256 clones by plasma from as much as 2 years earlier suggested incomplete viral escape, nonetheless titers against later clones were reduced at least 40-fold to less than 1:1,000. Escape mutations were identified in each lineage, either at R166 or at K169, suggesting that strain-specific and BCN antibodies targeted overlapping epitopes. Furthermore, the early dependence of CAP256 neutralizing antibodies on the N160 glycan decreased with the onset of neutralization breadth, indicating a change in specificity. These data suggest rapid maturation, within 11 weeks, of CAP256 strain-specific antibodies to acquire breadth, with implications for the vaccine elicitation of BCN V2-dependent antibodies. Overall these studies demonstrate that ongoing viral escape is possible, even from BCN antibodies.

  17. Titer on chip: new analytical tool for influenza vaccine potency determination.

    Directory of Open Access Journals (Sweden)

    Laura R Kuck

    Full Text Available Titer on Chip (Flu-ToC is a new technique for quantification of influenza hemagglutinin (HA concentration. In order to evaluate the potential of this new technique, a comparison of Flu-ToC to more conventional methods was conducted using recombinant HA produced in a baculovirus expression system as a test case. Samples from current vaccine strains were collected from four different steps in the manufacturing process. A total of 19 samples were analysed by Flu-ToC (blinded, single radial immunodiffusion (SRID, an enzyme-linked immunosorbent assay (ELISA, and the purity adjusted bicinchoninic acid assay (paBCA. The results indicated reasonable linear correlation between Flu-ToC and SRID, ELISA, and paBCA, with regression slopes of log-log plots being 0.91, 1.03, and 0.91, respectively. The average ratio for HA content measured by Flu-ToC relative to SRID, ELISA, and paBCA was 83%, 147%, and 81%, respectively; indicating nearly equivalent potency determination for Flu-ToC relative to SRID and paBCA. These results, combined with demonstrated multiplexed analysis of all components within a quadrivalent formulation and robust response to HA strains over a wide time period, support the conclusion that Flu-ToC can be used as a reliable and time-saving alternative potency assay for influenza vaccines.

  18. The Effects of Pesticides on Queen Rearing and Virus Titers in Honey Bees (Apis mellifera L.

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    Gloria DeGrandi-Hoffman

    2013-01-01

    Full Text Available The effects of sublethal pesticide exposure on queen emergence and virus titers were examined. Queen rearing colonies were fed pollen with chlorpyrifos (CPF alone (pollen-1 and with CPF and the fungicide Pristine® (pollen-2. Fewer queens emerged when larvae from open foraging (i.e., outside colonies were reared in colonies fed pollen-1 or 2 compared with when those larvae were reared in outside colonies. Larvae grafted from and reared in colonies fed pollen-2 had lower rates of queen emergence than pollen-1 or outside colonies. Deformed wing virus (DWV and black queen cell virus were found in nurse bees from colonies fed pollen-1 or 2 and in outside colonies. The viruses also were detected in queen larvae. However, we did not detect virus in emerged queens grafted from and reared in outside colonies. In contrast, DWV was found in all emerged queens grafted from colonies fed pollen-1 or 2 either reared in outside hives or those fed pollen-1 or 2. The results suggest that sublethal exposure of CPF alone but especially when Pristine® is added reduces queen emergence possibly due to compromised immunity in developing queens.

  19. The Effects of Pesticides on Queen Rearing and Virus Titers in Honey Bees (Apis mellifera L.)

    Science.gov (United States)

    DeGrandi-Hoffman, Gloria; Chen, Yanping; Simonds, Roger

    2013-01-01

    The effects of sublethal pesticide exposure on queen emergence and virus titers were examined. Queen rearing colonies were fed pollen with chlorpyrifos (CPF) alone (pollen-1) and with CPF and the fungicide Pristine® (pollen-2). Fewer queens emerged when larvae from open foraging (i.e., outside) colonies were reared in colonies fed pollen-1 or 2 compared with when those larvae were reared in outside colonies. Larvae grafted from and reared in colonies fed pollen-2 had lower rates of queen emergence than pollen-1 or outside colonies. Deformed wing virus (DWV) and black queen cell virus were found in nurse bees from colonies fed pollen-1 or 2 and in outside colonies. The viruses also were detected in queen larvae. However, we did not detect virus in emerged queens grafted from and reared in outside colonies. In contrast, DWV was found in all emerged queens grafted from colonies fed pollen-1 or 2 either reared in outside hives or those fed pollen-1 or 2. The results suggest that sublethal exposure of CPF alone but especially when Pristine® is added reduces queen emergence possibly due to compromised immunity in developing queens. PMID:26466796

  20. Ecdysteriod titers during the molt cycle of the blue crab resemble those of other crustacea

    Energy Technology Data Exchange (ETDEWEB)

    Soumoff, C.; Skinner, D.M.

    1983-08-01

    Callinectes sapidus is the only true crab (brachyuran) whose pattern of ecdysteroid titers has been described as departing from the pattern seen in other decapods. While ecdysteroids in other crabs reach a peak just prior to ecdysis, those of C. sapidus were claimed to reach their maxima after ecdysis. The data reported here challenge these findings. Ecdysteroids were measured in hemolymph, ovaries, and whole animal extracts of blue crabs using a radioimmunoassay. In hemolymph and whole animals, ecdysteroid levels rose during premolt to a maximum at stage D/sub 3/. Ecdysteroids declined rapidly from late premolt stage D/sub 4/ through postmolt stage A/sub 2/, increased slightly at postmolt stage B, and returned to low levels where they remained during intermolt stage C. Ecdysteroid levels in males and immature females were not significantly different but mature females, having reached a terminal anecdysis, had signifincatly lower ecdysteroid levels. Ovaries of mature females accumulated ecdysteroids during vitellogenesis while the concentration of ecdysteroids in hemolymph was low.

  1. Heterogeneity of Polyneuropathy Associated with Anti-MAG Antibodies

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    Laurent Magy

    2015-01-01

    Full Text Available Polyneuropathy associated with IgM monoclonal gammopathy and anti-myelin associated glycoprotein (MAG antibodies is an immune-mediated demyelinating neuropathy. The pathophysiology of this condition is likely to involve anti-MAG antibody deposition on myelin sheaths of the peripheral nerves and it is supposed to be distinct from chronic inflammatory demyelinating neuropathy (CIDP, another immune-mediated demyelinating peripheral neuropathy. In this series, we have retrospectively reviewed clinical and laboratory findings from 60 patients with polyneuropathy, IgM gammopathy, and anti-MAG antibodies. We found that the clinical picture in these patients is highly variable suggesting a direct link between the monoclonal gammopathy and the neuropathy. Conversely, one-third of patients had a CIDP-like phenotype on electrodiagnostic testing and this was correlated with a low titer of anti-MAG antibodies and the absence of widening of myelin lamellae. Our data suggest that polyneuropathy associated with anti-MAG antibodies is less homogeneous than previously said and that the pathophysiology of the condition is likely to be heterogeneous as well with the self-antigen being MAG in most of the patients but possibly being another component of myelin in the others.

  2. Effect of anticapsular antibodies on neutrophil phagocytosis of Staphylococcus aureus.

    Science.gov (United States)

    Guidry, A J; Oliver, S P; Squiggins, K E; Erbe, E F; Dowlen, H H; Hambleton, C N; Berning, L M

    1991-10-01

    One of the major virulence factors of Staphylococcus aureus is development of an exopolysaccharide capsule in vivo, which inhibits recognition of antibodies to highly antigenic cell wall by neutrophils. To circumvent this inhibition, an attempt was made to produce anticapsular antibodies. Three cows per group were immunized in midlactation by injections in the area of the supramammary lymph node and intramuscularly and were boosted on d 14, 42, and 70 with three variants of Smith S. aureus: compact, unencapsulated; diffuse, rigid capsule; and diffuse large clearing, exceptionally large flaccid capsule using dextran sulfate as adjuvant. Serum agglutination and ELISA titers of cows immunized with diffuse and diffuse large clearing increased after immunization and after each boost and remained elevated to the end of the experiment at 112 d. Phagocytosis of diffuse and diffuse large clearing, measured by flow cytometry, was enhanced by immunization with either organism. No antibody response to capsule or enhanced phagocytosis of diffuse developed in cows immunized with compact. However, anticompact antibodies were opsonic for diffuse large clearing. These data show that bovine antibodies to S. aureus capsule are opsonic for bovine neutrophils and that capsule plays a role in inhibition of cell-wall opsonization of S. aureus.

  3. Sexual difference in juvenile-hormone titer in workers leads to sex-biased soldier differentiation in termites.

    Science.gov (United States)

    Toga, Kouhei; Hanmoto, Shutaro; Suzuki, Ryutaro; Watanabe, Dai; Miura, Toru; Maekawa, Kiyoto

    2016-04-01

    In termites, the soldier caste, with its specialized defensive morphology, is one of the most important characteristics for sociality. Most of the basal termite species have both male and female soldiers, and the soldier sex ratio is almost equal or only slightly biased. However, in the apical lineages (especially family Termitidae), there are many species that have soldiers with strongly biased sex ratio. Generally in termites, since high juvenile hormone (JH) titer is required for soldier differentiation from a worker via a presoldier stage, it was hypothesized that the biased soldier-sex ratio was caused by differences in JH sensitivity and/or JH titer between male and female workers. Therefore, we focused on the presoldier differentiation and the worker JH titer in species with only male soldiers (Nasutitermes takasagoensis) and with both male and female soldiers (Reticulitermes speratus) in natural conditions. In the former species, there are four types of workers; male minor, male medium, female medium and female major workers, and presoldiers differentiate from male minor workers. First, we tried to artificially induce presoldiers from male and female workers. In N. takasagoensis, the presoldier differentiation rate and mortality was significantly higher in male minor workers. Morphological analyses showed that both male and female induced presoldiers possessed normal soldier-specific morphologies. It was suggested that female workers, from which soldiers do not differentiate under natural conditions, also maintained the physiological and developmental potential for soldier differentiation. In R. speratus, however, no differences were observed in solder differentiation rate and mortality between male and female workers. Second, the JH titers of each sex/type of workers were quantified by high performance liquid chromatography-mass spectrometry in two different seasons (April and December). The results showed that, in N. takasagoensis, JH titer in male minor

  4. Antibody response of five bird species after vaccination with a killed West Nile virus vaccine.

    Science.gov (United States)

    Okeson, Danelle M; Llizo, Shirley Yeo; Miller, Christine L; Glaser, Amy L

    2007-06-01

    West Nile virus has been associated with numerous bird mortalities in the United States since 1999. Five avian species at three zoological parks were selected to assess the antibody response to vaccination for West Nile virus: black-footed penguins (Spheniscus demersus), little blue penguins (Eudyptula minor), American flamingos (Phoenicopterus ruber), Chilean flamingos (Phoenicopterus chilensis), and Attwater's prairie chickens (Tympanuchus cupido attwateri). All birds were vaccinated intramuscularly at least twice with a commercially available inactivated whole virus vaccine (Innovator). Significant differences in antibody titer over time were detected for black-footed penguins and both flamingo species.

  5. Effects of a Formula Containing Two Types of Prebiotics, Bifidogenic Growth Stimulator and Galacto-oligosaccharide, and Fermented Milk Products on Intestinal Microbiota and Antibody Response to Influenza Vaccine in Elderly Patients: A Randomized Controlled Trial

    Directory of Open Access Journals (Sweden)

    Shinya Nagafuchi

    2015-06-01

    Full Text Available We investigated the effect of a formula containing two different prebiotics (bifidogenic growth stimulator and galacto-oligosaccharide and fermented milk products on intestinal microbiota and antibody responses to an influenza vaccine in enterally fed elderly in-patients. Patients were administered either formula containing prebiotics and fermented milk products (group F: n = 12, 79.9 ± 9.5 years old or standard formula (group C: n = 12, 80.7 ± 10.1 years old via percutaneous endoscopic gastrostomy during a 14-week intervention period. Subjects were immunized with an influenza vaccine (A/H1N1, A/H3N2, and B at week 4 of the intervention. Blood biochemical indices, intestinal bacteria populations and antibody titers were analyzed. Bifidobacterium counts increased significantly in group F compared with group C. The enhanced antibody titers against A/H1N1 were maintained in group F for a longer period compared with group C. The titers against A/H3N2 were unchanged between both groups, and those against B were significantly lower in group F than in group C, although few subjects had seroprotective titers against A/H3N2 and B. These results suggest that administration of the formula containing prebiotics and fermented milk products may maintain antibody titers for longer periods through the improvement of intestinal microbiota.

  6. Analysis of Anti-Influenza Virus Neuraminidase Antibodies in Children, Adults, and the Elderly by ELISA and Enzyme Inhibition: Evidence for Original Antigenic Sin.

    Science.gov (United States)

    Rajendran, Madhusudan; Nachbagauer, Raffael; Ermler, Megan E; Bunduc, Paul; Amanat, Fatima; Izikson, Ruvim; Cox, Manon; Palese, Peter; Eichelberger, Maryna; Krammer, Florian

    2017-03-21

    Antibody responses to influenza virus hemagglutinin provide protection against infection and are well studied. Less is known about the human antibody responses to the second surface glycoprotein, neuraminidase. Here, we assessed human antibody reactivity to a panel of N1, N2, and influenza B virus neuraminidases in different age groups, including children, adults, and the elderly. Using enzyme-linked immunosorbent assays (ELISA), we determined the breadth, magnitude, and isotype distribution of neuraminidase antibody responses to historic, current, and avian strains, as well as to recent isolates to which these individuals have not been exposed. It appears that antibody levels against N1 neuraminidases were lower than those against N2 or B neuraminidases. The anti-neuraminidase antibody levels increased with age and were, in general, highest against strains that circulated during the childhood of the tested individuals, providing evidence for "original antigenic sin." Titers measured by ELISA correlated well with titers measured by the neuraminidase inhibition assays. However, in the case of the 2009 pandemic H1N1 virus, we found evidence of interference from antibodies binding to the conserved stalk domain of the hemagglutinin. In conclusion, we found that antibodies against the neuraminidase differ in magnitude and breadth between subtypes and age groups in the human population. (This study has been registered at ClinicalTrials.gov under registration no. NCT00336453, NCT00539981, and NCT00395174.)IMPORTANCE Anti-neuraminidase antibodies can afford broad protection from influenza virus infection in animal models and humans. However, little is known about the breadth and magnitude of the anti-neuraminidase response in the human population. Here we assessed antibody levels of children, adults, and the elderly against a panel of N1, N2, and type B influenza virus neuraminidases. We demonstrated that antibody levels measured by ELISA correlate well with functional

  7. High-titer preparation of Bombyx mori nucleopolyhedrovirus (BmNPV displaying recombinant protein in silkworm larvae by size exclusion chromatography and its characterization

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    Tanaka Shigeyasu

    2009-06-01

    Full Text Available Abstract Background Budded baculoviruses are utilized for vaccine, the production of antibody and functional analysis of transmembrane proteins. In this study, we tried to produce and purify the recombinant Bombyx mori nucleopolyhedrovirus (rBmNPV-hPRR that displayed human (prorenin receptor (hPRR connected with FLAG peptide sequence on its own surface. These particles were used for further binding analysis of hPRR to human prorenin. The rBmNPV-hPRR was produced in silkworm larvae and purified from its hemolymph using size exclusion chromatography (SEC. Results A rapid method of BmNPV titer determination in hemolymph was performed using quantitative real-time PCR (Q-PCR. A correlation coefficient of BmNPV determination between end-point dilution and Q-PCR methods was found to be 0.99. rBmNPV-hPRR bacmid-injected silkworm larvae produced recombinant baculovirus of 1.31 × 108 plaque forming unit (pfu in hemolymph, which was 2.8 × 104 times higher than transfection solution in Bm5 cells. Its purification yield by Sephacryl S-1000 SF column chromatography was 264 fold from larval hemolymph at 4 days post-injection (p.i., but 35 or 39 fold at 4.5 or 5 days p.i., respectively. Protein patterns of rBmNPV-hPRR purified at 4 and 5 days were the same and ratio of envelope proteins (76, 45 and 35 kDa to VP39, one of nucleocapsid proteins, increased at 5 days p.i. hPRR was detected in only purified rBmNPV-hPRR at 5 days p.i.. Conclusion The successful purification of rBmNPV-hPRR indicates that baculovirus production using silkworm larvae and its purification from hemolymph by Sephacryl S-1000 SF column chromatography can provide an economical approach in obtaining the purified BmNPV stocks with high titer for large-scale production of hPRR. Also, it can be utilized for further binding analysis and screening of inhibitors of hPRR.

  8. Antibody persistence after serogroup C meningococcal conjugate vaccine in children with sickle cell disease.

    Science.gov (United States)

    Souza, Alessandra R; Maruyama, Claudia M; Sáfadi, Marco Aurélio P; Lopes, Marta H; Azevedo, Raymundo S; Findlow, Helen; Bai, Xilian; Borrow, Ray; Weckx, Lily Y

    2016-08-05

    A decline of protective antibody titers after MCC vaccine has been demonstrated in healthy children, this may be an issue of concern for risk groups. The aim of this study was to evaluate the persistence of bactericidal antibodies after MCC vaccine in sickle cell disease (SCD) patients. The type of vaccine used and booster response were also analyzed. SCD patients (n=141) previously immunized with MCC vaccines had blood drawn 2-8 years after the last priming dose. They were distributed according to age at primary immunization into groups: vaccination (2-3, 4-5 and 6-8). Serum bactericidal antibodies with baby rabbit complement (rSBA) and serogroup C-specific IgG concentrations were measured. The correlate of protection was rSBA titer ⩾8. Subjects with rSBA children primed under 2years of age rSBA titer ⩾8 was demonstrated in 53.3%, 21.7% and 35.0%, 2-3, 4-5, 6-8years, respectively, after vaccination, compared with 70.0%, 45.0% and 53.5%, respectively, for individuals primed at ages 2-13years. rSBA median titers and IgG median levels were higher in the older group. Six to eight years after vaccination the percentage of patients with rSBA titers ⩾8 was significantly higher in the group primed with MCC-TT (78.5%) compared with those primed with MCC-CRM197 [Menjugate® (33.3%) or Meningitec® (35.7%)] (p=0.033). After a booster, 98% achieved rSBA titer ⩾8. Immunity to meningococcal serogroup C in SCD children declines rapidly after vaccination and is dependent on the age at priming. Booster doses are needed to maintain protection in SCD patients. Persistence of antibodies seems to be longer in individuals primed with MCC-TT vaccine comparing to those immunized with MCC-CRM197. Copyright © 2016 Elsevier Ltd. All rights reserved.

  9. Increased titer and reduced lactate accumulation in recombinant retrovirus production through the down-regulation of HIF1 and PDK.

    Science.gov (United States)

    Rodrigues, A F; Guerreiro, M R; Formas-Oliveira, A S; Fernandes, P; Blechert, A-K; Genzel, Y; Alves, P M; Hu, W S; Coroadinha, A S

    2016-01-01

    Many mammalian cell lines used in the manufacturing of biopharmaceuticals exhibit high glycolytic flux predominantly channeled to the production of lactate. The accumulation of lactate in culture reduces cell viability and may also decrease product quality. In this work, we engineered a HEK 293 derived cell line producing a recombinant gene therapy retroviral vector, by down-regulating hypoxia inducible factor 1 (HIF1) and pyruvate dehydrogenase kinase (PDK). Specific productivity of infectious viral titers could be increased more than 20-fold for single gene knock-down (HIF1 or PDK) and more than 30-fold under combined down-regulation. Lactate production was reduced up to 4-fold. However, the reduction in lactate production, alone, was not sufficient to enhance the titer: high-titer clones also showed significant enrollment of metabolic routes not related to lactate production. Transcriptome analysis indicated activation of biological amines metabolism, detoxification routes, including glutathione metabolism, pentose phosphate pathway, glycogen biosynthesis and amino acid catabolism. The latter were validated by enzyme activity assays and metabolite profiling, respectively. High-titer clones also presented substantially increased transcript levels of the viral genes expression cassettes. The results herein presented demonstrate the impact of HIF1 and PDK down-regulation on the production performance of a mammalian cell line, reporting one of the highest fold-increase in specific productivity of infectious virus titers achieved by metabolic engineering. They additionally highlight the contribution of secondary pathways, beyond those related to lactate production, that can be also explored to pursue improved metabolic status favoring a high-producing phenotype. © 2015 Wiley Periodicals, Inc.

  10. Utility of clinical assessment, imaging, and cryptococcal antigen titer to predict AIDS-related complicated forms of cryptococcal meningitis

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    Kandel Sean

    2010-08-01

    Full Text Available Abstract Background This study aimed to evaluate the prevalence and predictors of AIDS-related complicated cryptococcal meningitis. The outcome was complicated cryptococcal meningitis: prolonged (≥ 14 days altered mental status, persistent (≥ 14 days focal neurologic findings, cerebrospinal fluid (CSF shunt placement or death. Predictor variable operating characteristics were estimated using receiver operating characteristic curve (ROC analysis. Multivariate analysis identified independent predictors of the outcome. Results From 1990-2009, 82 patients with first episode of cryptococcal meningitis were identified. Of these, 14 (17% met criteria for complicated forms of cryptococcal meningitis (prolonged altered mental status 6, persistent focal neurologic findings 7, CSF surgical shunt placement 8, and death 5. Patients with complicated cryptococcal meningitis had higher frequency of baseline focal neurological findings, head computed tomography (CT abnormalities, mean CSF opening pressure, and cryptococcal antigen (CRAG titers in serum and CSF. ROC area of log2 serum and CSF CRAG titers to predict complicated forms of cryptococcal meningitis were comparable, 0.78 (95%CI: 0.66 to 0.90 vs. 0.78 (95% CI: 0.67 to 0.89, respectively (χ2, p = 0.95. The ROC areas to predict the outcomes were similar for CSF pressure and CSF CRAG titers. In a multiple logistic regression model, the following were significant predictors of the outcome: baseline focal neurologic findings, head CT abnormalities and log2 CSF CRAG titer. Conclusions During initial clinical evaluation, a focal neurologic exam, abnormal head CT and large cryptococcal burden measured by CRAG titer are associated with the outcome of complicated cryptococcal meningitis following 2 weeks from antifungal therapy initiation.

  11. Production of high titer attenuated poliovirus strains on the serum-free PER.C6(®) cell culture platform for the generation of safe and affordable next generation IPV.

    Science.gov (United States)

    Sanders, Barbara P; Oakes, Isabel de los Rios; van Hoek, Vladimir; Liu, Ying; Marissen, Wilfred; Minor, Philip D; Wimmer, Eckard; Schuitemaker, Hanneke; Custers, Jerome H H V; Macadam, Andrew; Cello, Jeronimo; Edo-Matas, Diana

    2015-11-27

    As poliovirus eradication draws closer, alternative Inactivated Poliovirus Vaccines (IPV) are needed to overcome the risks associated with continued use of the Oral Poliovirus Vaccine and of neurovirulent strains used during manufacture of conventional (c) IPV. We have previously demonstrated the susceptibility of the PER.C6(®) cell line to cIPV strains; here we investigated the suspension cell culture platform for growth of attenuated poliovirus strains. We examined attenuated Sabin strain productivity on the PER.C6(®) cell platform compared to the conventional Vero cell platform. The suitability of the suspension cell platform for propagation of rationally-attenuated poliovirus strains (stabilized Sabin type 3 S19 derivatives and genetically attenuated and stabilized MonoCre(X) strains), was also assessed. Yields were quantified by infectious titer determination and D-antigen ELISA using either serotype-specific polyclonal rabbit sera for Sabin strains or monoclonal cIPV-strain-specific antibodies for cIPV, S19 and MonoCre(X) strains. PER.C6(®) cells supported the replication of Sabin strains to yields of infectious titers that were in the range of cIPV strains at 32.5°C. Sabin strains achieved 30-fold higher yields (pIPV vaccines needed for achieving and maintaining poliovirus eradication. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. The relevance of microbial allergens to the IgE antibody repertoire in atopic and nonatopic eczema.

    Science.gov (United States)

    Reefer, Amanda J; Satinover, Shama M; Wilson, Barbara B; Woodfolk, Judith A

    2007-07-01

    A propensity to microbial skin infections has been reported in atopic ("high IgE") and nonatopic ("low IgE") forms of eczema. However, the relationship between antimicrobial IgE antibodies and nonatopic disease is unclear. We examined the relevance of microbial allergens to the allergen-specific IgE antibody repertoire in patients with atopic dermatitis. Patients with IgE levels of less than 150 IU/mL were stratified according to sensitivity (n = 22) or no sensitivity (n = 27) to 11 common food allergens and aeroallergens. The prevalence and titers of antimicrobial IgE antibodies were compared with those of patients (n = 36) with increased total IgE levels (>150 IU/mL). Skin-derived serum chemokines were also analyzed. Patients with low IgE levels showed decreased disease severity, increased age of onset, a striking female predominance, and a distinct distribution of skin lesions. High titer IgE antibodies (sum of 8 bacterial and fungal allergens = 29.8 +/- 32.6 IU/mL) and multisensitization specific for microbial allergens was characteristic of patients with high IgE levels, with an overall 84% positivity; however, antimicrobial IgE antibodies comprised 3% or less of allergen-specific IgE antibodies. By contrast, antimicrobial IgE antibodies were detected in only 20% of patients with low IgE, and titers were negligible, irrespective of sensitization to common allergens. These patients were monosensitized, and exclusive microbial sensitivity was uncommon (10%). Patients with low IgE with no sensitivity to common allergens had lower levels of serum macrophage inflammatory protein 3alpha compared with their sensitized counterparts. Antimicrobial IgE antibodies are uncommon in patients with atopic dermatitis with low IgE levels. Hypersensitivity to microbial allergens is an unlikely trigger for eczematous eruptions in patients with low IgE levels.

  13. Comparison of neutralizing and hemagglutination-inhibiting antibody responses to influenza A virus vaccination of human immunodeficiency virus-infected individuals

    NARCIS (Netherlands)

    Benne, CA; Harmsen, M; Tavares, L; Kraaijeveld, CA; De Jong, JC

    A neutralization enzyme immunoassay (N-EIA) was used to determine the neutralizing serum antibody titers to influenza A/Taiwan/1/86 (H1N1) and Beijing/353/89 (H3N2) viruses after vaccination of 51 human immunodeficiency virus (HIV) type 1-infected individuals and 10 healthy noninfected controls

  14. Canine Parvovirus (CPV) Vaccination: Comparison of Neutralizing Antibody Responses in Pups after Inoculation with CPV2 or CPV2b Modified Live Virus Vaccine

    Science.gov (United States)

    Pratelli, Annamaria; Cavalli, Alessandra; Martella, Vito; Tempesta, Maria; Decaro, Nicola; Carmichael, Leland Eugene; Buonavoglia, Canio

    2001-01-01

    Canine parvovirus type 2 (CPV2) emerged in 1978 as causative agent of a new disease of dogs. New antigenic variants (biotypes), designated CPV2a and CPV2b, became widespread during 1979 to 1980 and 1984, respectively. At the present time the original CPV2 has disappeared in the dog population and has been replaced by the two new viruses. In the present study the comparison of neutralizing antibody titers in two groups of pups (18 pups in each group) inoculated with CPV2 and CPV2b modified live virus vaccines is reported. Using the hemagglutination inhibition (HI) test, relevant differences between antibody titers, against either the homologous or the heterologous virus, were not constantly observed. Using the neutralization (Nt) test, however, the pups inoculated with CPV2 had antibody titers which were approximately 30 times higher to the homologous virus (mean, 4,732) than to the heterologous virus (CPV2b) (mean, 162). The results of these experiments support two conclusions: (i) the HI test may not always accurately evaluate the true immune status of dogs with respect to CPV, and (ii) dogs inoculated with CPV2 vaccine develop relatively low Nt antibody titers against the heterologous virus (CPV2b). These data may suggest an advantage for new vaccines, considering that most presently licensed vaccines are produced with CPV2, which no longer exists in the dog population. PMID:11329467

  15. [Analysis of specific IgE antibodies to staphylococcal enterotoxins, total serum IgE and hemogramme in carriers of Staphylococcus aureus].

    Science.gov (United States)

    Saitoh, Masaru; Asaka, Kiyomi; Arai, Miho; Kawabata, Akira; Kanoh, Sekio; Kanoh, Takako

    2002-08-01

    In order to evaluate the relationship between nasal carriers of S. aureus and their history of allergic diseases, the total serum IgE titer, the hemogramme pattern, and the titers of specific IgE antibody to Staphylococcal enterotoxins A and B (SEA and SEB) and of specific IgG antibody to SEB were investigated in 98 trade school students. Fifteen (15.3%) of the 98 students were sensitized to SEA and/or SEB (40.0% to SEA and 93.3% to SEB). In this group, 11 subjects were S. aureus carriers (73.0%) and 12 had a history of allergic diseases (80.0%). Low levels of specific IgG antibody to SEB were identified from both S. aureus carriers and non-carriers. The S. aureus carriers had significantly higher levels of total IgE titer than the non-carriers and the individuals with a history of allergic diseases had significantly higher total IgE titer levels than those having no history of allergic diseases (p hemogramme patterns of S. aureus carriers, a significant positive correlation was observed between the total IgE antibodies and the eosinophil rate (p < 0.05), and a negative correlation (p < 0.001) was recognized between the neutrophil and the lymphocyte rates.

  16. Níveis de anticorpos contra o vírus da cinomose canina e o parvovírus canino em cães não vacinados e vacinados Antibodies levels against canine distemper virus and canine parvovirus in vaccinated and unvaccinated dogs

    Directory of Open Access Journals (Sweden)

    R. Hass

    2008-02-01

    Full Text Available Antibody titres to canine distemper virus (CDV and canine parvovirus (CPV were measured in 132 dogs: 80 had been vaccinated at least once, 22 had not been vaccinated, and 30 had unknown vaccination history. Serum antibody titers were measured by means of serum neutralization (CDV or hemagglutination inhibition (CPV. Serum CDV titers >20 and serum CPV titers >80 were considered protective. Protective antibodies to CDV were present in 40.1% of the population: 39.8% of the vaccinated dogs, 31.8% unvaccinated, and in 46.6% of the dogs with unknown vaccination history. Protective antibodies to CPV were present in 90.9% of the dogs: 93.7% of the vaccinated dogs, 90.9% of the unvaccinated, and 83.3% of the dogs with unknown vaccination history.

  17. NSP4 antibody levels in rotavirus gastroenteritis patients with seizures.

    Science.gov (United States)

    Yeom, Jung Sook; Kim, Young-Soo; Jun, Jin-Su; Do, Hyun Jung; Park, Ji Sook; Seo, Ji-Hyun; Park, Eun Sil; Lim, Jae-Young; Woo, Hyang-Ok; Park, Chan-Hoo; Youn, Hee-Shang

    2017-03-01

    Rotavirus nonstructural protein 4 (NSP4) has been suggested as a pathogen of rotavirus-associated seizures. We investigated pre-existing serum antibodies against NSP4 and VP6 (the most highly immunogenic rotavirus protein) in patients with rotavirus gastroenteritis and its correlation with the occurrence of seizures. With an enzyme-linked immunosorbent assay, IgG and IgA titers against NSP4 (genotype [A] and [B]) and VP6 were measured in acute-phase sera of 202 children aged 0.5-6.0 years with rotavirus gastroenteritis. The clinical characteristics and antibody levels were compared between patients with (seizure group) and without seizures (non-seizure group). The non-seizure and seizure groups comprised 173 and 29 patients, respectively. Age, sex, hospital stay, presence of fever, white blood cell counts, C-reactive protein, vaccine status, IgG/IgA titers for VP6, and IgA titers for both NSP4s did not differ between the groups. The seizure group showed a lower level of IgG against NSP4 [A] (184.5 vs. 163.0 U/mL; P = 0.03) and NSP4 [B] (269.0 vs. 196.0 U/mL; P = 0.02). Delayed sampling time from the onset of gastroenteritis symptoms (3 vs. 2 days; P = 0.02) and lower serum sodium level (133.4 vs. 136.3 mEq/L; P rotavirus-associated seizures. Copyright © 2016 European Paediatric Neurology Society. Published by Elsevier Ltd. All rights reserved.

  18. Prevalence of antibodies to arenaviruses in rodents from the southern and western United States: evidence for an arenavirus associated with the genus Neotoma.

    Science.gov (United States)

    Kosoy, M Y; Elliott, L H; Ksiazek, T G; Fulhorst, C F; Rollin, P E; Childs, J E; Mills, J N; Maupin, G O; Peters, C J

    1996-06-01

    The objectives of this study were to extend our knowledge of the geographic distribution and rodent host range of arenaviruses in North America. Sera from wild rodents collected from the southern and western United States were tested for antibody against Tamiami, Pichinde, Junin, and lymphocytic choriomeningitis viruses, using an indirect fluorescent antibody test. Antibody to at least one arenavirus was found in 220 (3.1%) of 7,106 rodents tested. The antibody-positive animals included Mus musculus from Florida and Texas; Neotoma albigula from Arizona, Colorado, and New Mexico; N. fuscipes and N. lepida from California: N. mexicana from Arizona, New Mexico, and Utah; N. stephensi from Arizona and New Mexico; and Oryzomys palustris and Sigmodon hispidus from Florida. Sigmodon hispidus seropositive for Tamiami virus were found only in Florida (156 [27.0%] of 578 tested), although 463 hispid cotton rats from outside that state were examined. High-titered antibodies to Tamiami virus were present in sera from S. hispidus, (geometric mean antibody titer [GMAT] of 1:792), whereas sera from Neotoma spp. reacted at high titer to both Tamiami (GMAT = 1:905) and Pichinde (GMAT = 1:433) viruses. The results suggest that arenaviruses are widely distributed in the southern United States and that one or more indigenous arenaviruses are associated with Neotoma spp. in North America.

  19. A consensus envelope protein domain III can induce neutralizing antibody responses against serotype 2 of dengue virus in non-human primates.

    Science.gov (United States)

    Chen, Hsin-Wei; Liu, Shih-Jen; Li, Yi-Shiuan; Liu, Hsueh-Hung; Tsai, Jy-Ping; Chiang, Chen-Yi; Chen, Mei-Yu; Hwang, Chyi-Sing; Huang, Chin-Cheng; Hu, Hui-Mei; Chung, Han-Hsuan; Wu, Sze-Hsien; Chong, Pele; Leng, Chih-Hsiang; Pan, Chien-Hsiung

    2013-07-01

    We have previously demonstrated that vaccination with a subunit dengue vaccine containing a consensus envelope domain III with aluminum phosphate elicits neutralizing antibodies against all four serotypes of dengue virus in mice. In this study, we evaluated the immunogenicity of the subunit dengue vaccine in non-human primates. After vaccination, monkeys that received the subunit vaccine with aluminum phosphate developed a significantly strong and long-lasting antibody response. A specific T cell response with cytokine production was also induced, and this correlated with the antibody response. Additionally, neutralizing antibodies against serotype 2 were detected in two of three monkeys. The increase in serotype-2-specific antibody titers and avidity observed in these two monkeys suggested that a serotype-2-biased antibody response occurs. These data provide evidence that a protective neutralizing antibody response was successfully elicited in non-human primates by the dengue subunit vaccine with aluminum phosphate adjuvant.

  20. Autologous antibody is protective against HSV-1 infection of the immunocompromised mouse.

    Science.gov (United States)

    Alexander, T S; Rosenthal, K S

    1990-09-01

    The protective capability of autologous anti-herpes simplex virus type 1 (anti-HSV-1) antibody was analyzed in immunosuppressed mice. Immunologically naive, immunosuppressed mice infected with a low-passage clinical HSV-1 isolate developed local site lesions, monoplegia, paraplegia, and died within 8 days. Mice that had recovered from a previous HSV-1 infection and were immunosuppressed with cyclophosphamide and then rechallenged with live virus showed no symptoms and survived. Untreated mice that had recovered from infection (primed mice) had high titers of anti-HSV-1 antibody and a delayed type hypersensitivity (DTH) response to virus challenge. Cyclophosphamide treatment, but not lethal irradiation, could ablate the DTH response, resulting in a lack of antivirus cell-mediated immunity. Antibody was the only demonstrable protective immune function in the cyclophosphamide-treated animals. This indicates that cell-mediated immunity is not required for protection against HSV-1 challenge in individuals with virus-specific antibody.

  1. Miller-Fisher Syndrome: Are Anti-GAD Antibodies Implicated in Its Pathophysiology?

    Science.gov (United States)

    Dagklis, Ioannis E; Papagiannopoulos, Sotirios; Theodoridou, Varvara; Kazis, Dimitrios; Argyropoulou, Ourania; Bostantjopoulou, Sevasti

    2016-01-01

    Miller-Fisher syndrome (MFS) is considered as a variant of the Guillain-Barre syndrome (GBS) and its characteristic clinical features are ophthalmoplegia, ataxia, and areflexia. Typically, it is associated with anti-GQ1b antibodies; however, a significant percentage (>10%) of these patients are seronegative. Here, we report a 67-year-old female patient who presented with the typical clinical features of MFS. Workup revealed antibodies against glutamic acid decarboxylase (GAD) in relatively high titers while GQ1b antibodies were negative. Neurological improvement was observed after intravenous gamma globulin and follow-up examinations showed a continuous clinical amelioration with simultaneous decline of anti-GAD levels which finally returned to normal values. This case indicates that anti-GAD antibodies may be associated with a broader clinical spectrum and future studies in GQ1b-seronegative patients could determine ultimately their clinical and pathogenetic significance in this syndrome.

  2. Miller-Fisher Syndrome: Are Anti-GAD Antibodies Implicated in Its Pathophysiology?

    Directory of Open Access Journals (Sweden)

    Ioannis E. Dagklis

    2016-01-01

    Full Text Available Miller-Fisher syndrome (MFS is considered as a variant of the Guillain-Barre syndrome (GBS and its characteristic clinical features are ophthalmoplegia, ataxia, and areflexia. Typically, it is associated with anti-GQ1b antibodies; however, a significant percentage (>10% of these patients are seronegative. Here, we report a 67-year-old female patient who presented with the typical clinical features of MFS. Workup revealed antibodies against glutamic acid decarboxylase (GAD in relatively high titers while GQ1b antibodies were negative. Neurological improvement was observed after intravenous gamma globulin and follow-up examinations showed a continuous clinical amelioration with simultaneous decline of anti-GAD levels which finally returned to normal values. This case indicates that anti-GAD antibodies may be associated with a broader clinical spectrum and future studies in GQ1b-seronegative patients could determine ultimately their clinical and pathogenetic significance in this syndrome.

  3. Influence of vaccine potency and booster administration of foot-and-mouth disease vaccines on the antibody response in calves with maternal antibodies.

    Science.gov (United States)

    Çokçalışkan, Can; Türkoğlu, Tunçer; Uzunlu, Ergün; Sareyyüpoğlu, Beyhan; Hancı, İbrahim; İpek, Ahmet; Arslan, Abdullah; Babak, Ayca; İldeniz, Gülnur; Gülyaz, Veli

    2017-08-31

    Foot-and-mouth disease is one of the most important viral diseases of cloven-hoofed animals. Mass vaccination is an effective method to control the disease and is frequently utilized in endemic regions. Sufficient protection of young animals is important in mass vaccination campaigns. Maternal antibodies negatively affect the success of vaccination. Hence, determination of the optimal vaccination age is crucial for the uninterrupted protection of young animals. This study was performed to identify the effect of vaccine potency and booster administration on serum neutralizing antibody titers of calves with different levels of maternal antibodies. Calves (n = 111) on a state farm were used in this study. Oil adjuvant foot-and-mouth disease vaccines with 3 PD50 and 6 PD50 potencies were used with or without booster administration. Serum samples were collected each month up to day 120 postvaccination. Virus neutralization tests were used to measure the serum neutralizing antibody titers and estimate the protection period by using pre-determined cut-off values for protection. The results revealed that a vaccination with a 6 PD50 potency vaccine, preferably followed by a booster dose, should be used to overcome maternal immunity for incessant protection.

  4. THE INFLUENCE OF NEUTRALIZING ANTIBODIES TO INTERFERON-BETA ON PROGRESSION OF MULTIPLE SCLEROSIS

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    V. Yu. Lizhdvoy

    2016-01-01

    Full Text Available Background: Neutralizing antibodies (NAbs affect the effectiveness of interferon therapy in patients with multiple sclerosis; however, this influence cannot be considered as unequivocal. NAbs formation is determined by several factors, such as frequency and duration of administration, interferon-β (IFN-β formulation and the patient's genotype. It has been found that NAb titers vary over time. Aim: To assess the levels of NAbs to IFN-β in patients with multiple sclerosis and to investigate their relationship to disease progression. Materials and methods: We analyzed serum samples from 83  multiple sclerosis patients after a  long-term IFN-β-1b treatment; NAbs detection reaction was performed by assessment of their cytopathic effect. Results: NAbs were found in 63.9%  (53  of 83 of patients with duration of IFN-β-1b treatment of 33.3±17.6 months. All NAb-positive patients were treated with highdose IFN-β. Patients with titers>800  LU (n=28 demonstrated a  trend towards more advanced neurologic deficit on the Expanded Disability Status Scale (EDSS, compared to the patients with normal NAbs titers (0  to 20  LU, n=30 and intermediate titers (20 to 800 LU, n=25 (p>0.05. The exacerbation rate in the group with NAbs titers from 20  to 800  LU was insignificantly lower than that in the group with NAbs>800 and in the NAb-negative patients (p>0.05. Conclusion: Testing for NAbs may be a promising method for monitoring of IFN-β therapy in multiple sclerosis. There was a trend towards more pronounced neurological deficit in patients with high NAbs titers, but paradoxical data on a high rate of exacerbations in NAb-negative patients requires further study. 

  5. Evaluation of infectious titer in a candidate HSV type 2 vaccine by a quantitative molecular approach.

    Science.gov (United States)

    Azizi, Ali; Tang, Mei; Gisonni-Lex, Lucy; Mallet, Laurent

    2013-12-06

    One of the critical tasks in analytical testing is to monitor and assign the infectivity or potency of viral based vaccines from process development to production of final clinical lots. In this study, a high throughput RT-qPCR based approach was developed to evaluate the infectious titre in a replication-defective HSV-2 candidate vaccine, called HSV529. This assay is a combination of viral propagation and quantitative RT-PCR which measures the amount of RNA in infected cells after incubation with test samples. The relative infectious titre of HSV529 candidate vaccine was determined by a RT-qPCR method targeting HSV-2 gD2 gene. The data were analyzed using the parallel-line analysis as described in the European Pharmacopoeia 8th edition. The stability of HSV529 test samples were also investigated in a concordance study between RT-qPCR infectivity assay and a classical plaque assays. A suitable correlation was determined between both assays using an identical sample set in both assays. The RT-qPCR infectivity assay was further characterized by evaluating the intermediate precision and accuracy. The coefficient of variation from the six independent assays was less than 10%. The accuracy of each of the assay was also evaluated in the range of 92.91% to 120.57%. Our data demonstrate that the developed RT-qPCR infectivity assay is a rapid high throughput approach to quantify the infectious titer or potency of live attenuated or defective viral-based vaccines, an attribute which is associated with product quality.

  6. Titer plate formatted continuous flow thermal reactors for high throughput applications: fabrication and testing

    Science.gov (United States)

    Sang-Won Park, Daniel; Chen, Pin-Chuan; You, Byoung Hee; Kim, Namwon; Park, Taehyun; Lee, Tae Yoon; Datta, Proyag; Desta, Yohannes; Soper, Steven A.; Nikitopoulos, Dimitris E.; Murphy, Michael C.

    2010-05-01

    A high throughput, multi-well (96) polymerase chain reaction (PCR) platform, based on a continuous flow (CF) mode of operation, was developed. Each CFPCR device was confined to a footprint of 8 × 8 mm2, matching the footprint of a well on a standard micro-titer plate. While several CFPCR devices have been demonstrated, this is the first example of a high-throughput multi-well continuous flow thermal reactor configuration. Verification of the feasibility of the multi-well CFPCR device was carried out at each stage of development from manufacturing to demonstrating sample amplification. The multi-well CFPCR devices were fabricated by micro-replication in polymers, polycarbonate to accommodate the peak temperatures during thermal cycling in this case, using double-sided hot embossing. One side of the substrate contained the thermal reactors and the opposite side was patterned with structures to enhance thermal isolation of the closely packed constant temperature zones. A 99 bp target from a λ-DNA template was successfully amplified in a prototype multi-well CFPCR device with a total reaction time as low as ~5 min at a flow velocity of 3 mm s-1 (15.3 s cycle-1) and a relatively low amplification efficiency compared to a bench-top thermal cycler for a 20-cycle device; reducing the flow velocity to 1 mm s-1 (46.2 s cycle-1) gave a seven-fold improvement in amplification efficiency. Amplification efficiencies increased at all flow velocities for 25-cycle devices with the same configuration.

  7. Effects of on-arrival versus delayed clostridial or modified live respiratory vaccinations on health, performance, bovine viral diarrhea virus type I titers, and stress and immune measures of newly received beef calves.

    Science.gov (United States)

    Richeson, J T; Kegley, E B; Gadberry, M S; Beck, P A; Powell, J G; Jones, C A

    2009-07-01

    Stress, commonly associated with weaning, marketing, and shipment of feeder cattle, can compromise immune function, and vaccine administration during immunosuppression may reduce vaccine efficacy and calf growth. Four treatments were compared in a 2 x 2 factorial arrangement to evaluate the effect of on-arrival (d 0) vs. delayed (d 14) administration of clostridial (CLOS) and respiratory (RESP) vaccines on health, performance, bovine viral diarrhea virus (BVDV) antibody titers, and physiological immune measurements of high-risk, newly received calves. Crossbred bull and steer calves (n = 263) were weighed (239 +/- 1.2 kg), stratified by sex, and randomly assigned to vaccination treatment: 1) arrival CLOS, arrival RESP (ACAR); 2) arrival CLOS, delayed RESP (ACDR); 3) delayed CLOS, arrival RESP (DCAR); and 4) delayed CLOS, delayed RESP (DCDR). Body weight and blood samples were collected on d 0, 14, 28, 42, and 56. Average daily gain did not differ (P > or = 0.34), averaging 0.98, 0.93, 0.95, and 0.91 kg/d for ACAR, ACDR, DCAR, and DCDR, respectively, for the entire 56-d trial. Vaccination timing did not affect morbidity (P > or = 0.23); however, there tended to be a CLOS timing effect (P = 0.07) and RESP timing effect (P = 0.09) on days to initial bovine respiratory disease (BRD) treatment. Average days to initial BRD treatment were less for ACAR (6 +/- 0.8 d) compared with DCDR (8 +/- 0.8 d; P = 0.01). Greater white blood cell counts were observed for DCDR than ACDR (P = 0.01), with ACAR and DCAR being intermediate. Serum cortisol concentrations were greater on d 0 than d 14 (P gain or morbidity in high risk, newly received stocker calves. Calves administered RESP vaccine on d 0 developed antibody titers to BVDV type I earlier than delayed RESP treatments. Total white blood cell count was greatest when RESP and CLOS vaccination were delayed (DCDR).

  8. Leptospira spp. vaccinal antibodies do not react with Borrelia burgdorferi peptides used in the AccuPlex 4.

    Science.gov (United States)

    Caress, Amber L; Moroff, Scott; Lappin, Michael R

    2017-11-01

    We attempted to determine if Leptospira spp. antibodies induced by vaccination would cross-react with Borrelia burgdorferi antigens used in a commercial automated immunofluorescent assay (AccuPlex 4 BioCD; Antech). Staff- and student-owned dogs ( n = 31) were recruited at a veterinary teaching hospital in a B. burgdorferi nonendemic area. The dogs were randomized and administered 1 of 4 commercial Leptospira spp. vaccines that contained serovars Canicola, Grippotyphosa, Icterohaemorrhagiae, and Pomona, then booster vaccinated 3 wk later. Blood was collected on weeks 0, 3, 4, 8, and 12. After confirming that maximal Leptospira spp. titers occurred on week 4, aliquots of sera from week 4 were shipped frozen for analysis of B. burgdorferi antibodies against OspA, OspC, OspF, P39, and SLP with the AccuPlex system. Week 4 sera from all 31 dogs had a titer of 1:100 for at least 1 Leptospira spp. serovar. Titers of 1:800 or greater were detected against multiple serovars in 27 dogs. None of the samples contained antibodies against the B. burgdorferi OspA, OspC, OspF, P39, and SLP peptides used in the commercial assay. The B. burgdorferi peptides used in the AccuPlex system do not recognize naturally occurring Leptospira spp. antibodies or those induced by the commercial Leptospira spp. vaccines administered in our study.

  9. Protective antibody responses against A(H1N1)pdm09 primed by infection and recalled by intranasal vaccination.

    Science.gov (United States)

    Ikeda, Kazuyuki; Ainai, Akira; Hasegawa, Hideki

    2015-11-09

    This study investigated the effects of preceding infection and administration of whole inactivated virus (WIV) vaccine on immune responses against influenza virus challenge. Preceding infection alone provided minimal reduction in virus titer following viral challenge. Single administration of intranasal or subcutaneous WIV vaccine alone failed to reduce virus titers and induce antibody responses. Subcutaneous administration of A/Narita/1/09 (A/NRT)-WIV after A/NRT infection provided complete protection against infection and yielded low nasal IgA and high serum IgG antibody responses. Subcutaneous administration of A/NRT-WIV after A/Puerto Rico/8/34 (A/PR8) infection provided no protection. Conversely, intranasal administration of A/NRT-WIV after A/NRT infection provided complete protection and high nasal IgA and serum IgG antibody responses. While, intranasal administration of A/NRT-WIV after A/PR8 infection provided moderate reduction in viral titer with moderate increases in nasal IgA antibodies. These results indicate that intranasal vaccination is superior to subcutaneous vaccination in inducing protective immune responses after preceding heterologous infection. Copyright © 2015 Elsevier Ltd. All rights reserved.

  10. Association between Haemagglutination inhibiting antibodies and protection against clade 6B viruses in 2013 and 2015.

    Science.gov (United States)

    Ng, Sophia; Saborio, Saira; Kuan, Guillermina; Gresh, Lionel; Sanchez, Nery; Ojeda, Sergio; Harris, Eva; Balmaseda, Angel; Gordon, Aubree

    2017-10-27

    The epidemiology of the pandemic A(H1N1) virus has been changing as population immunity continues to co-evolve with the virus. The impact of genetic changes in the virus on human's susceptibility is an outstanding important question in vaccine design. In a community-based study, we aim to (1) determine the genetic characteristics of 2009-2015 pandemic H1N1 viruses, (2) assess antibody response following natural infections and (3) assess the correlation of A/California/07/09 antibody titers to protection in the 2013 and 2015 epidemics. In a household transmission study, serum specimens from 253 individuals in Managua, Nicaragua were analyzed. Combined nose and throat swabs were collected to detect RT-PCR confirmed influenza infection and virus sequencing. Hemagglutination inhibition assays were performed and the protective titer for circulating H1N1pdm was determined. Clade 6B pandemic H1N1 viruses predominated in Nicaragua during the 2013 and 2015 seasons. Our household transmission study detected a household secondary attack rate of 17% in 2013 and 33% in 2015. Infected individuals, including vaccinees, showed an apparent antibody response to A/California/07/09. Baseline titers of A/California/07/09 antibodies were found to associate with protection in both seasons. A titer of ≥1:40 correlated to a 44% protection in children, a 29% protection in adults 15-49years old and a 51% protection in adults 50-85years old. In 2013 and 2015, antibody titers to A/California/07/09 associated with an infection risk reduction amongst exposed household contacts. This is consistent with a detectable vaccine effectiveness reported in a number of studies. Genetic changes in clade 6B viruses might have led to a reduced immunity in some whereas others might have been less affected. The use of human serologic data is important in virus characterization and if performed in a timely manner, could assist in vaccine strain selection. Copyright © 2017 Elsevier Ltd. All rights reserved.

  11. Assessment of anti-CarP antibodies, disease activity and quality of life in rheumatoid arthritis patients on conventional and biological disease-modifying antirheumatic drugs.

    Science.gov (United States)

    Kumar, Sudhir; Pangtey, Ghanshyam; Gupta, Rachna; Rehan, Harmeet Singh; Gupta, Lalit Kumar

    2017-01-01

    Good biomarkers are important to guide decisions in the clinical management of rheumatoid arthritis (RA). RA patients harbor antibodies directed against carbamylated proteins which may predict joint damage. This study investigated whether antibodies against carbamylated proteins (anti-CarP) may serve as surrogate prognostic markers. Fifty-three patients with a diagnosis of rheumatoid arthritis according to ACR 1987 criteria were included. Blood samples were analyzed for CarP antibody levels using the ELISA method. Quality of life (QoL) was assessed by the WHO SF-36 questionnaire, and disease activity was assessed using the DAS28 calculator. Newly diagnosed patients were assessed at the first visit and at 12 weeks of treatment, while a single assessment was made for patients already on maintenance therapy. Out of 53 patients, 22 had titers of anti-CarP above the cut-off range and considered as positive for anti-CarP antibodies. Anti-CarP antibody serum level was significantly higher in patients with deformity of joints and with erosions in comparison to those without any destructive changes (p 0.05). Also there was a weak negative correlation in all domains of quality of life with anti-CarP antibody titers (p > 0.05). There was no significant correlation between titers of anti-CarP antibodies and presence or absence of rheumatoid factor. Serum levels of anti-CarP antibodies in RA patients with joint erosions/deformities were much higher than in those without any joint damage. Anti-CarP antibodies may have good prognostic value in RA patients with erosions. Disease activity and QoL of RA patients improved during treatment, but no correlation was found between DAS 28/QoL and anti-CarP antibody serum levels.

  12. PRODUCTION OF POLYCLONAL ANTIBODY TO THE COAT PROTEIN OF CITRUS TRISTEZA VIRUS IN CHICKEN EGGS

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    Nurhadi Nurhadi

    2016-10-01

    Full Text Available Citrus tristeza virus (CTV is one of the most destructive diseases in many citrus growing areas of Indonesia. Effective strategies for controlling CTV depend on diagnostic procedure namely enzyme-linked immunosorbent assay (ELISA. Study aimed to purify the CTV antigen and produced its polyclonal antibody. Virion of the severe CTV isolate designated UPM/ T-002 was concentrated by polyethylene glycol (PEG precipitation combined with low speed centrifugation. Semipurified antigen was further purified by sodium dodecyl sulphatepolyacrylamide gel electrophoresis (SDS-PAGE. The specific coat protein (CP band of CTV with molecular weight of 25 kD was excised and eluted using elution buffer containing 0.25 M Tris-HCl pH 6.8 + 0.1% SDS, then used as antigen for injection into 6-month-old female of White Leghorn chicken. Results, showed than the specific polyclonal antibody raised against the 25-kDa CP had a titer of approximately 104, gave low background reaction with healthy plant sap and reacted specifically with CTV isolates. The reaction was equally strong for a severe, a moderate, a mild, and a symptomless isolate, suggesting a broad reaction range of this antibody toward different CTV isolates. Optimal virus titer can be obtained since virus loss during purification could be minimized and the highly purified antigen as an immunogen could be obtained by cutting out the CP band from SDS-PAGE gels. Large amount of highly titer of CTV antibody can be produced in chicken egg. The simplicity of the procedure makes it economically acceptable and technically adoptable because the antibody can be produced in basic laboratory.

  13. Fermentative production of high titer citric acid from corn stover feedstock after dry dilute acid pretreatment and biodetoxification.

    Science.gov (United States)

    Zhou, Ping-Ping; Meng, Jiao; Bao, Jie

    2017-01-01

    The aim of this work is to study the citric acid fermentation by a robust strain Aspergillus niger SIIM M288 using corn stover feedstock after dry dilute sulfuric acid pretreatment and biodetoxification. Citric acid at 100.04g/L with the yield of 94.11% was obtained, which are comparable to the starch or sucrose based citric acid fermentation. No free wastewater was generated in the overall process from the pretreatment to citric acid fermentation. Abundant divalent metal ions as well as high titer of potassium, phosphate, and nitrogen were found in corn stover hydrolysate. Further addition of extra nutrients showed no impact on increasing citric acid formation except minimum nitrogen source was required. Various fermentation parameters were tested and only minimum regulation was required during the fermentation. This study provided a biorefining process for citric acid fermentation from lignocellulose feedstock with the maximum citric acid titer and yield. Copyright © 2016 Elsevier Ltd. All rights reserved.

  14. High titer gluconic acid fermentation by Aspergillus niger from dry dilute acid pretreated corn stover without detoxification.

    Science.gov (United States)

    Zhang, Hongsen; Zhang, Jian; Bao, Jie

    2016-03-01

    This study reported a high titer gluconic acid fermentation using dry dilute acid pretreated corn stover (DDAP) hydrolysate without detoxification. The selected fermenting strain Aspergillus niger SIIM M276 was capable of inhibitor degradation thus no detoxification on pretreated corn stover was required. Parameters of gluconic acid fermentation in corn stover hydrolysate were optimized in flasks and in fermentors to achieve 76.67 g/L gluconic acid with overall yield of 94.91%. The sodium gluconate obtained from corn stover was used as additive for extending setting time of cement mortar and similar function was obtained with starch based sodium gluconate. This study provided the first high titer gluconic acid production from lignocellulosic feedstock with potential of industrial applications. Copyright © 2015 Elsevier Ltd. All rights reserved.

  15. Therapeutic Recombinant Monoclonal Antibodies

    Science.gov (United States)

    Bakhtiar, Ray

    2012-01-01

    During the last two decades, the rapid growth of biotechnology-derived techniques has led to a myriad of therapeutic recombinant monoclonal antibodies with significant clinical benefits. Recombinant monoclonal antibodies can be obtained from a number of natural sources such as animal cell cultures using recombinant DNA engineering. In contrast to…

  16. Expression of recombinant Antibodies

    Directory of Open Access Journals (Sweden)

    André eFrenzel

    2013-07-01

    Full Text Available Recombinant antibodies are highly specific detection probes in research, diagnostics and have emerged over the last two decades as the fastest growing class of therapeutic proteins. Antibody generation has been dramatically accelerated by in vitro selection systems, particularly phage display. An increasing variety of recombinant production systems have been developed, ranging from Gram-negative and positive bacteria, yeasts and filamentous fungi, insect cell lines, mammalian cells to transgenic plants and animals. Currently, almost all therapeutic antibodies are still produced in mammalian cell lines in order to reduce the risk of immunogenicity due to altered, non-human glycosylation patterns. However, recent developments of glycosylation-engineered yeast, insect cell lines and transgenic plants are promising to obtain antibodies with human-like post-translational modifications. Furthermore, smaller antibody fragments including bispecific antibodies without any glycosylation are successfully produced in bacteria and have advanced to clinical testing. The first therapeutic antibody products from a non-mammalian source can be expected in coming next years. In this review, we focus on current antibody production systems including their usability for different applications.

  17. Expression of Recombinant Antibodies

    Science.gov (United States)

    Frenzel, André; Hust, Michael; Schirrmann, Thomas

    2013-01-01

    Recombinant antibodies are highly specific detection probes in research, diagnostics, and have emerged over the last two decades as the fastest growing class of therapeutic proteins. Antibody generation has been dramatically accelerated by in vitro selection systems, particularly phage display. An increasing variety of recombinant production systems have been developed, ranging from Gram-negative and positive bacteria, yeasts and filamentous fungi, insect cell lines, mammalian cells to transgenic plants and animals. Currently, almost all therapeutic antibodies are still produced in mammalian cell lines in order to reduce the risk of immunogenicity due to altered, non-human glycosylation patterns. However, recent developments of glycosylation-engineered yeast, insect cell lines, and transgenic plants are promising to obtain antibodies with “human-like” post-translational modifications. Furthermore, smaller antibody fragments including bispecific antibodies without any glycosylation are successfully produced in bacteria and have advanced to clinical testing. The first therapeutic antibody products from a non-mammalian source can be expected in coming next years. In this review, we focus on current antibody production systems including their usability for different applications. PMID:23908655

  18. A Recombinant Antibody-Expressing Influenza Virus Delays Tumor Growth in a Mouse Model

    Directory of Open Access Journals (Sweden)

    Jennifer R. Hamilton

    2018-01-01

    Full Text Available Influenza A virus (IAV has shown promise as an oncolytic agent. To improve IAV as an oncolytic virus, we sought to design a transgenic virus expressing an immune checkpoint-inhibiting antibody during the viral life cycle. To test whether it was possible to express an antibody during infection, an influenza virus was constructed encoding the heavy chain of an antibody on the PB1 segment and the light chain of an antibody on the PA segment. This antibody-expressing IAV grows to high titers, and the antibodies secreted from infected cells exhibit comparable functionality with hybridoma-produced antibodies. To enhance the anti-cancer activity of IAV, an influenza virus was engineered to express a single-chain antibody antagonizing the immune checkpoint CTLA4 (IAV-CTLA4. In mice implanted with the aggressive B16-F10 melanoma, intratumoral injection with IAV-CTLA4 delayed the growth of treated tumors, mediated an abscopal effect, and increased overall survival.

  19. Pharmacodynamic modeling of the in vivo interaction between cefotaxime and ofloxacin by using serum ultrafiltrate inhibitory titers.

    OpenAIRE

    Nix, D E; Wilton, J H; Hyatt, J; Thomas, J; Strenkoski-Nix, L C; Forrest, A; Schentag, J J

    1997-01-01

    The pharmacokinetics (PK) and pharmacodynamics (PD) of cefotaxime and ofloxacin and of their combination were examined in a three-period randomized crossover study involving 12 healthy adults. The PK of cefotaxime and ofloxacin were modeled. PD was assessed from the predicted concentrations in serum and serum untrafiltrate inhibitory titers for 10 test organisms. An inhibitory sigmoid Emax model based on the probability of bacterial growth was used, where Emax = 1 and EC50 is the concentratio...

  20. Production and purification of high-titer foamy virus vector for the treatment of leukocyte adhesion deficiency

    Directory of Open Access Journals (Sweden)

    Md Nasimuzzaman

    2016-01-01

    Full Text Available Compared to other integrating viral vectors, foamy virus (FV vectors have distinct advantages as a gene transfer tool, including their nonpathogenicity, the ability to carry larger transgene cassettes, and increased stability of virus particles due to DNA genome formation within the virions. Proof of principle of its therapeutic utility was provided with the correction of canine leukocyte adhesion deficiency using autologous CD34+ cells transduced with FV vector carrying the canine CD18 gene, demonstrating its long-term safety and efficacy. However, infectious titers of FV-human(hCD18 were low and not suitable for manufacturing of clinical-grade product. Herein, we developed a scalable production and purification process that resulted in 60-fold higher FV-hCD18 titers from ∼1.7 × 104 to 1.0 × 106 infectious units (IU/ml. Process development improvements included use of polyethylenimine-based transfection, use of a codon-optimized gag, heparin affinity chromatography, tangential flow filtration, and ultracentrifugation, which reproducibly resulted in 5,000-fold concentrated and purified virus, an overall yield of 19 ± 3%, and final titers of 1–2 × 109 IU/ml. Highly concentrated vector allowed reduction of final dimethyl sulfoxide (DMSO concentration, thereby avoiding DMSO-induced toxicity to CD34+ cells while maintaining high transduction efficiencies. This process development results in clinically relevant, high titer FV which can be scaled up for clinical grade production.

  1. Drug Reaction with Eosinophilia and Systemic Symptoms: DRESS following Initiation of Oxcarbazepine with Elevated Human Herpesvirus-6 Titer

    Directory of Open Access Journals (Sweden)

    Seth L. Cornell

    2014-01-01

    Full Text Available Drug reaction with eosinophilia and systemic symptoms (DRESS is a rare and potentially fatal severe cutaneous reaction, which has a delayed onset after the initiation of an inciting medication. After recognition and withdrawal of the causative agent, along with aggressive management, a majority of patients will have complete recovery over several months. We present a rare case of DRESS secondary to oxcarbazepine with an elevated human herpesvirus-6 titer.

  2. A novel HPV 16 L1-based chimeric virus-like particle containing E6 and E7 seroreactive epitopes permits highly specific detection of antibodies in patients with CIN 1 and HPV-16 infection.

    Science.gov (United States)

    Monroy-García, Alberto; Gómez-Lim, Miguel A; Weiss-Steider, Benny; la Rosa, Georgina Paz-de; Hernández-Montes, Jorge; Pérez-Saldaña, Karyna; Tapia-Guerrero, Yessica S; Toledo-Guzmán, Mariel E; Santiago-Osorio, Edelmiro; Sanchez-Peña, Héctor I; Mora-García, María de Lourdes

    2011-02-09

    The presence of IgG antibodies to HPV-16 L1-virus like particles (VLPs) in serum has been reported as a result of persistent exposure to the virus and as a marker of disease progression. However, detection of VLP-specific antibodies in sera does not always indicate a malignant lesion as positive results may also be due to a nonmalignant viral infection. Furthermore, malignant lesions are associated with an increased antibody titer for E6 and E7 proteins. The aim of this study was to develop an ELISA using a novel chimeric virus-like particle (cVLP) encoding an L1 protein fused with a string of HPV-16 E6 and E7 seroreactive epitopes to its C-terminus to be used for detection of HPV-16 specific antibodies in patients with cervical intraepithelial lesion grade 1 (CIN 1). The sera of 30 patients with CIN 1 who also tested positive for HPV-16 DNA and of 30 age-matched normal donors negative for HPV infection were tested for the presence of IgG antibodies specific for either VLP-L1 (HPV-16 L1), gVLP (derived from Gardasil), or cVLP by ELISA. The cVLP-reactive sera yielded two distinct groups of results: (H) reactivity levels that presented very strong cVLP-specific titers, and (L) reactivity levels with significantly lower titers similar to those obtained with VLP-L1 and gVLP antigens. Additionally, the sera that presented the higher cVLP titers closely matched those that had significantly stronger reactivity to E6 and E7 epitopes. Interestingly, the samples with the highest titers corresponded to patients with the higher numbers of sexual partners and pregnancies. On the other hand only 4 out of the 12 sera that harbored antibodies with VLP neutralizing ability corresponded to the group with high cVLP antibody titers. We report for the first time that chimeric particles containing HPV-16 L1 protein fused with E6 and E7 seroreactive epitopes enable much better detection of IgG antibodies in the sera of CIN 1 patients positive for HPV-16 infection than those obtained with

  3. Strategies to generate high-titer, high-potency recombinant AAV3 serotype vectors

    Directory of Open Access Journals (Sweden)

    Chen Ling

    2016-01-01

    Full Text Available Although recombinant adeno-associated virus serotype 3 (AAV3 vectors were largely ignored previously, owing to their poor transduction efficiency in most cells and tissues examined, our initial observation of the selective tropism of AAV3 serotype vectors for human liver cancer cell lines and primary human hepatocytes has led to renewed interest in this serotype. AAV3 vectors and their variants have recently proven to be extremely efficient in targeting human and nonhuman primate hepatocytes in vitro as well as in vivo. In the present studies, we wished to evaluate the relative contributions of the cis-acting inverted terminal repeats (ITRs from AAV3 (ITR3, as well as the trans-acting Rep proteins from AAV3 (Rep3 in the AAV3 vector production and transduction. To this end, we utilized two helper plasmids: pAAVr2c3, which carries rep2 and cap3 genes, and pAAVr3c3, which carries rep3 and cap3 genes. The combined use of AAV3 ITRs, AAV3 Rep proteins, and AAV3 capsids led to the production of recombinant vectors, AAV3-Rep3/ITR3, with up to approximately two to fourfold higher titers than AAV3-Rep2/ITR2 vectors produced using AAV2 ITRs, AAV2 Rep proteins, and AAV3 capsids. We also observed that the transduction efficiency of Rep3/ITR3 AAV3 vectors was approximately fourfold higher than that of Rep2/ITR2 AAV3 vectors in human hepatocellular carcinoma cell lines in vitro. The transduction efficiency of Rep3/ITR3 vectors was increased by ∼10-fold, when AAV3 capsids containing mutations in two surface-exposed residues (serine 663 and threonine 492 were used to generate a S663V+T492V double-mutant AAV3 vector. The Rep3/ITR3 AAV3 vectors also transduced human liver tumors in vivo approximately twofold more efficiently than those generated with Rep2/ITR2. Our data suggest that the transduction efficiency of AAV3 vectors can be significantly improved both using homologous Rep proteins and ITRs as well as by capsid optimization. Thus, the combined use of

  4. HIV-Specific Antibody-Dependent Cellular Cytotoxicity (ADCC) - Mediating Antibodies Decline while NK Cell Function Increases during Antiretroviral Therapy (ART)

    DEFF Research Database (Denmark)

    Jensen, Sanne Skov; Fomsgaard, Anders; Borggren, Marie

    2015-01-01

    Understanding alterations in HIV-specific immune responses during antiretroviral therapy (ART), such as antibody-dependent cellular cytotoxicity (ADCC), is important in the development of novel strategies to control HIV-1 infection. This study included 53 HIV-1 positive individuals. We evaluated...... the ability of effector cells and antibodies to mediate ADCC separately and in combination using the ADCC-PanToxiLux assay. The ability of the peripheral blood mononuclear cells (PBMCs) to mediate ADCC was significantly higher in individuals who had been treated with ART before seroconversion, compared...... to the individuals initiating ART at a low CD4+ T cell count (ART-naïve individuals. The frequency of CD16 expressing natural killer (NK) cells correlated with both the duration of ART and Granzyme B (GzB) activity. In contrast, the plasma titer of antibodies mediating ADCC declined...

  5. Iso-migrastatin Titer Improvement in the Engineered Streptomyces lividans SB11002 Strain by Optimization of Fermentation Conditions

    Science.gov (United States)

    Wu, Xueyun; Yang, Dong; Zhu, Xiangcheng; Feng, Zhiyang; Lv, Zhengbin; Zhang, Yaozhou; Shen, Ben; Xu, Zhinan

    2011-01-01

    The heterologous production of iso-migrastatin (iso-MGS) was successfully demonstrated in an engineered S. lividans SB11002 strain, which was derived from S. lividans K4–114, following introduction of pBS11001, which harbored the entire mgs biosynthetic gene cluster. However, under similar fermentation conditions, the iso-MGS titer in the engineered strain was significantly lower than that in the native producer - Streptomyces platensis NRRL 18993. To circumvent the problem of low iso-MGS titers and to expand the utility of this heterologous system for iso-MGS biosynthesis and engineering, systematic optimization of the fermentation medium was carried out. The effects of major components in the cultivation medium, including carbon, organic and inorganic nitrogen sources, were investigated using a single factor optimization method. As a result, sucrose and yeast extract were determined to be the best carbon and organic nitrogen sources, resulting in optimized iso-MGS production. Conversely, all other inorganic nitrogen sources evaluated produced various levels of inhibition of iso-MGS production. The final optimized R2YE production medium produced iso-MGS with a titer of 86.5 mg/L, about 3.6-fold higher than that in the original R2YE medium, and 1.5 fold higher than that found within the native S. platensis NRRL 18993 producer. PMID:21625393

  6. High titers of transmissible spongiform encephalopathy infectivity associated with extremely low levels of PrPSc in vivo.

    Science.gov (United States)

    Barron, Rona M; Campbell, Susan L; King, Declan; Bellon, Anne; Chapman, Karen E; Williamson, R Anthony; Manson, Jean C

    2007-12-07

    Diagnosis of transmissible spongiform encephalopathy (TSE) disease in humans and ruminants relies on the detection in post-mortem brain tissue of the protease-resistant form of the host glycoprotein PrP. The presence of this abnormal isoform (PrP(Sc)) in tissues is taken as indicative of the presence of TSE infectivity. Here we demonstrate conclusively that high titers of TSE infectivity can be present in brain tissue of animals that show clinical and vacuolar signs of TSE disease but contain low or undetectable levels of PrP(Sc). This work questions the correlation between PrP(Sc) level and the titer of infectivity and shows that tissues containing little or no proteinase K-resistant PrP can be infectious and harbor high titers of TSE infectivity. Reliance on protease-resistant PrP(Sc) as a sole measure of infectivity may therefore in some instances significantly underestimate biological properties of diagnostic samples, thereby undermining efforts to contain and eradicate TSEs.

  7. Fed-Batch Enzymatic Saccharification of High Solids Pretreated Lignocellulose for Obtaining High Titers and High Yields of Glucose.

    Science.gov (United States)

    Jung, Young Hoon; Park, Hyun Min; Kim, Dong Hyun; Yang, Jungwoo; Kim, Kyoung Heon

    2017-07-01

    To reduce the distillation costs of cellulosic ethanol, it is necessary to produce high sugar titers in the enzymatic saccharification step. To obtain high sugar titers, high biomass loadings of lignocellulose are necessary. In this study, to overcome the low saccharification yields and the low operability of high biomass loadings, a fed-batch saccharification process was developed using an enzyme reactor that was designed and built in-house. After optimizing the cellulase and biomass feeding profiles and the agitation speed, 132.6 g/L glucose and 76.0% theoretical maximum glucose were obtained from the 60 h saccharification of maleic acid-pretreated rice straw at a 30% (w/v) solids loading with 15 filter paper units (FPU) of Cellic CTec2/g glucan. This study demonstrated that through the proper optimization of fed-batch saccharification, both high sugar titers and high saccharification yields are possible, even with using the high solids loading (i.e., ≥30%) with the moderate enzyme loading (i.e., high solids saccharification process in cellulosic fuel and chemical production.

  8. Choices of capture chromatography technology in antibody manufacturing processes.

    Science.gov (United States)

    DiLeo, Michael; Ley, Arthur; Nixon, Andrew E; Chen, Jie

    2017-11-15

    The capture process employed in monoclonal antibody downstream purification is not only the most critically impacted process by increased antibody titer resulting from optimized mammalian cell culture expression systems, but also the most important purification step in determining overall process throughput, product quality, and economics. Advances in separation technology for capturing antibodies from complex feedstocks have been one focus of downstream purification process innovation for past 10 years. In this study, we evaluated new generation chromatography resins used in the antibody capture process including Protein A, cation exchange, and mixed mode chromatography to address the benefits and unique challenges posed by each chromatography approach. Our results demonstrate the benefit of improved binding capacity of new generation Protein A resins, address the concern of high concentration surge caused aggregation when using new generation cation exchange resins with over 100mg/mL binding capacity, and highlight the potential of multimodal cation exchange resins for capture process design. The new landscape of capture chromatography technologies provides options to achieve overall downstream purification outcome with high product quality and process efficiency. Copyright © 2017 Elsevier B.V. All rights reserved.

  9. Antibody response to diphtheria-tetanus-pertussis immunization in preterm infants who receive dexamethasone for chronic lung disease.

    Science.gov (United States)

    Robinson, Michael J; Heal, Carrie; Gardener, Elizabeth; Powell, Peter; Sims, Douglas G

    2004-04-01

    To study the effect of dexamethasone in preterm infants with chronic lung disease (CLD) on antibody response to routine immunization against diphtheria, tetanus, and pertussis (DTP). Serum samples were obtained before and after immunization with DTP (Trivax-AD) from an unselected cohort of 93 preterm infants in the United Kingdom. Antibodies to diphtheria and tetanus and to 4 pertussis antigens (pertussis toxin, filamentous hemagglutinin, pertactin, and fimbrial agglutinogens 2 + 3) were measured by an enzyme-linked immunosorbent assay. Linear regression models were fitted to the natural log of antibody titers to compare the dexamethasone-treated and -untreated infants adjusting for potential risk factors. Sixty-seven (72%) of 93 infants received dexamethasone. Preimmunization geometric mean titers (GMTs) were comparable in both groups for all antibodies. The rise in GMT after immunization was reduced in the dexamethasone-treated group. Final GMT was significantly lower for tetanus, diphtheria, pertussis toxin, and fimbrial agglutinogens 2 + 3 but not for filamentous hemagglutinin or pertactin. Using the minimum protective titer of 0.01 IU/mL, there was no significant reduction in protection for diphtheria and tetanus in the dexamethasone-treated infants. Using the higher reference titer of 0.1 IU/mL, there was a 16% reduction in protection for diphtheria (95% confidence interval: 3%-27%) and a 9% reduction in protection for tetanus (95% confidence interval: -7% to 20%). The use of dexamethasone for CLD in preterm infants is associated with a reduction in antibody titer to routine immunization against diphtheria and tetanus. Antibody responses to 2 of 4 pertussis antigens are reduced, but the clinical significance of this observation is unclear. Protection against tetanus and diphtheria is not impaired when the lower reference value for protective antibody is used. On the basis of this study of UK preterm infants who were treated with dexamethasone for the

  10. Antigen-specific antibody response in juvenile-onset SLE patients following routine immunization with tetanus toxoid.

    Science.gov (United States)

    Kashef, Sara; Ghazizadeh, Farid; Derakhshan, Ali; Farjadian, Shirin; Alyasin, Soheila

    2008-09-01

    Infection is now the most common cause of morbidity in Systemic Lupus Erythematosus (SLE). There is lack of information regarding the specific antibody formation in response to vaccines in young SLE patients. To determine the efficacy of anti-tetanus antibody response in young patients with SLE. Forty SLE patients with mean age of 14.1 years (range: 7-21) and 60 age and sex matched normal controls were enrolled in this study over a period of one year. Diagnosis was made according to the ACR criteria and disease activity was determined based on SLE Disease Activity Index (SLEDAI). All patients and controls had received the complete schedule of tetanus vaccinations consisting of three primary doses and two boosters by the age of six. Serum immunoglobulins and anti-tetanus antibody titers were determined by Nephelometry and ELISA. Anti-tetanus antibody levels greater than 0.1 IU/ml have been suggested as protective. In all of the patients and controls anti-tetanus antibody titer was > 0.1 IU/ml. IgG, IgA, and IgM levels were in the normal range for their age. Mean disease activity score was 4.9 (range: 0-16). There was no association between SLEDAI score and anti-tetanus antibody response. School age onset and immunosuppressive therapy does not seem to interfere with development of consistent immunity to tetanus vaccine in young SLE patients.

  11. Urine inhibitory titers against resistant Escherichia coli isolates after oral amoxicillin-sulbactam

    Directory of Open Access Journals (Sweden)

    J. M. Casellas

    2003-06-01

    Full Text Available It has been previously shown that following the oral administration of amoxicillin-sulbactam (AXS the urinary activity against Escherichia coli (Ec is due to beta-lactamase inhibition (i.e.TEM-1 as well as to the intrinsic activity of sulbactam (SB. Similarly, it has been previously demonstrated in volunteers that a single oral dose of AXS 500/500 mg allows high urine inhibitory titers (UITs against resistant Ec isolates. In this in vitro and ex vivo study we assessed the urinary activity of a new AXS proportion: 875/125 mg. Urine was collected from 12 volunteers at 0-2; 2-4; 4-6 h after a single oral dose of AXS 875/125mg. Previous studies had shown that pooled urine from 12 volunteers did not differ significantly in the UIT as compared to the mean individual values. Urine pools for each period were prepared. Each pool was tested for UIT against 60 Ec isolates received from 10 different laboratories in South American countries: 10 susceptible (S to AXS; 10 intermediate (I and 40 resistant (R; the latter ranging 32/16-256/128 mg/l. Amoxicillin (AX and SB urine concentrations were determined in all the samples. UIT ranged from 1/4 to >1/32 for S and I strains and from 1/1 to 1/4 for R strains. For one strain (AXS, MIC 256/128 mg/l the UIT titer was 1/1 at 2 and 4 h but it was not inhibited at 6 h. AX mean levels ranged from 1872 (2 h to 522 mg/l (6 h while SB ranged from 1075 (2 h to 334 (6 h mg/l. It is noteworthy that 59/60 strains were inhibited by 128 mg/l SB alone. In conclusion: the AXS 875/125 proportion has a remarkable in vitro and ex vivo activity against Ec urinary isolates.Previamente fue demostrado en un grupo de voluntarios que luego de una dosis oral de 500/500 mg de amoxicilina-sulbactam (AXS la actividad de la orina frente a cepas de Escherichia coli (Ec es debida a la acción inhibitoria de beta-lactamasas (ej: TEM-1 y a la actividad intrínseca de sulbactam (SB, y que dicha administración produce elevados títulos inhibitorios

  12. Correlated effects of selection for immunity in White Leghorn chicken lines on natural antibodies and specific antibody responses to KLH and M. butyricum

    Directory of Open Access Journals (Sweden)

    Gourichon David

    2008-01-01

    Full Text Available Abstract Background The effect of selection for three general immune response traits on primary antibody responses (Ab to Mycobacterium butyricum or keyhole limpet hemocyanin (KLH was studied in four experimental lines of White Leghorn chicken. Birds underwent 12 generations of selection for one of three different general immune criteria; high antibody response to Newcastle disease virus 3 weeks after vaccination (ND3, high cell-mediated immune response, using the wing web response to phytohemglutinin (PHA and high phagocytic activity, measured as carbone clearance (CC. Line ND3-L was selected on ND3, line PHA-L was selected on PHA, and line CC-L on CC, but all lines were measured for all three traits. The fourth line was a contemporary random bred control maintained throughout the selection experiment. Principal component analysis was used to distinguish clusters based on the overall set of immune measures. Results In the KLH immunised group, no differences were present between lines for natural antibodies binding to KLH and LPS, and, lines ND3-L and PHA-L had higher titers to LTA and anti-Gal titers measured before the immunisation protocol. The measure of ND3 was correlated positively with LPS titers measured post KLH immunisation and with the difference between LPS titers measured at day 0 and 7 post immunisation. In the M. butyricum immunised group, Line ND3-L showed significantly higher specific antibody response to M. butyricum, and this result agrees well with the hypothesis that the Th-1 pathway was expected to be selected for in this line. Conclusion This study has shown that the two different antigens KLH and M. butyricum gave rise to different responses in the set of selected lines, and that the response was only enhanced for the antigen associated with the same response mechanism as that for the trait (ND3, PHA or CC for which the line was selected. Interactions between innate and acquired immunity have been observed mainly for the

  13. Antibody engineering: methods and protocols

    National Research Council Canada - National Science Library

    Chames, Patrick

    2012-01-01

    "Antibody Engineering: Methods and Protocols, Second Edition was compiled to give complete and easy access to a variety of antibody engineering techniques, starting from the creation of antibody repertoires and efficient...

  14. Anti-insulin antibody test

    Science.gov (United States)

    Insulin antibodies - serum; Insulin Ab test; Insulin resistance - insulin antibodies; Diabetes - insulin antibodies ... You appear to have an allergic response to insulin Insulin no longer seems to control your diabetes

  15. Discordance of epstein-barr virus (ebv) specific humoral and cellular immunity in patients with malignant lymphomas : Elevated antibody titers and lowered invitro lymphocyte-reactivity

    NARCIS (Netherlands)

    ten Napel, C. H. H.; The, T. Hauw; van Egten-Bijker, J; de Gast, G. C.; Halie, M. R.; Langenhuysen, M. M. A. C.

    1978-01-01

    The relationship between specific viral cellular and humoral immunity to the Epstein–Barr Virus (EBV) was investigated in thirty-one untreated patients with malignant lymphoma (ML) and sex- and age-matched controls. In vitro reactivity of peripheral blood lymphocytes to heatinactivated purified EBV,

  16. Antibody titers to vaccination are not predictive of level of protection against a BVDV type 1b challenge in Bos indicus - Bos taurus steers

    Science.gov (United States)

    Subclinical illness associated with infection is thought to reduce performance and increase production costs in feedlot cattle, but underlying components remain largely unidentified. Vaccination is frequently used in feedlot settings but producers lack metrics that evaluate the effectiveness of vacc...

  17. Prevalence of antibodies to Chlamydophila abortus in ovines in the Londrina area of Paraná state, Brazil

    Directory of Open Access Journals (Sweden)

    Bruna Azevedo de Carvalho Lima

    2014-10-01

    Full Text Available The aim of this paper was to estimate the prevalence of antibodies to Chlamydophila abortus in ewes from the Londrina region of Paraná state. Blood samples from 267 adult ewes from eight herds were submitted to complement fixation testing. Tests were considered positive when the titers ? 32. Nineteen animals (7.11% in 7 (87.50% herds tested positive for antibodies against C. abortus. The titers were 32 in 17 animals and were 64 and 128 in the other two animals. The clinical signs recorded were abortion, stillbirth, weak newborns and heat repetition. The high frequency of herds with at least one positive animal and a seroprevalence of 7.11% suggest the presence of Chlamydophila abortus in the animals of studied herds.

  18. Clinical and neuroimaging correlates of antiphospholipid antibodies in multiple sclerosis: a preliminary study

    Directory of Open Access Journals (Sweden)

    Gonzalez-Toledo Eduardo

    2007-10-01

    Full Text Available Abstract Background The presence of antiphospholipid antibodies (APLA in multiple sclerosis (MS patients has been reported frequently but no clear relationship between APLA and the clinical and neuroimaging features of MS have heretofore been shown. We assessed the clinical and neuroimaging features of MS patients with plasma APLA. Methods A consecutive cohort of 24 subjects with relapsing-remitting (RR MS were studied of whom 7 were in remission (Rem and 17 in exacerbation (Exc. All subjects were examined and underwent MRI of brain. Patients' plasma was tested by standard ELISA for the presence of both IgM and IgG antibodies using a panel of 6 targets: cardiolipin (CL, β2 glycoprotein I (β2GPI, Factor VII/VIIa (FVIIa, phosphatidylcholine (PC, phosphatidylserine (PS and phosphatidylethanolamine (PE. Results In exacerbation up to 80% of MS subjects had elevated titers of IgM antibodies directed against the above antigens. However, in remission, less than half of MS patients had elevated titers of IgM antibodies against one or more of the above antigens. This difference was significant, p Conclusion The findings of this preliminary study show that increased APLA IgM is associated with exacerbations of MS. Currently, the significance of this association in pathogenesis of MS remains unknown. However, systematic longitudinal studies to measure APLA in larger cohorts of patients with relapsing-remitting MS, particularly before and after treatment with immunomodulatory agents, are needed to confirm these preliminary findings.

  19. PREVALENCE OF ANTI-STREPTOLYSIN O ANTIBODIES AT BANKE REGION NEPAL

    Directory of Open Access Journals (Sweden)

    Salman Khan

    2012-09-01

    Full Text Available Objective: Serum levels of anti-streptolysin O antibodies (ASO in the routine evaluation of patients with rheumatic conditions. Prevalence of elevated serum ASO titer in patients which were coming in OPD & IPD of Nepalgunj Medical College & teaching hospital with various clinical conditions.Method: This was a retrospective cross sectional study, which was performed in the centrallaboratory of Microbiology at Nepalgunj Medical College and teaching Hospital, Banke, Nepal during the period of September 2010 to April 2012. The serum samples were tested for Antistreptolysin O (ASO antibodies by latex agglutination test.Results: Total 308 patients including 40.91% male and 50.09% female were tested for ASO serum levels.140 were positive and 168 were negative .In 140positive cases 57 were male and 83 were female. In 168 negative cases 69 were male and 99 were female.Conclusion: The prevalence of Anti-streptolysin O (ASO antibody in total cases was 45.45%.In male was 45.24% and in female was 45.60%.the highest percentage was found in age group 0-21years. The presence of elevated streptococcal antibody titers in such a population, which probably reflects a high background prevalence of streptococcal infections, should be taken into consideration when evaluating the role of the group A streptococcus in non-purulent complications ofinfections.

  20. Quantification of the Impact of the HIV-1-Glycan Shield on Antibody Elicitation

    Energy Technology Data Exchange (ETDEWEB)

    Zhou, Tongqing; Doria-Rose, Nicole A.; Cheng, Cheng; Stewart-Jones, Guillaume B. E.; Chuang, Gwo-Yu; Chambers, Michael; Druz, Aliaksandr; Geng, Hui; McKee, Krisha; Kwon, Young Do; O’Dell, Sijy; Sastry, Mallika; Schmidt, Stephen D.; Xu, Kai; Chen, Lei; Chen, Rita E.; Louder, Mark K.; Pancera, Marie; Wanninger, Timothy G.; Zhang, Baoshan; Zheng, Anqi; Farney, S. Katie; Foulds, Kathryn E.; Georgiev, Ivelin S.; Joyce, M. Gordon; Lemmin, Thomas; Narpala, Sandeep; Rawi, Reda; Soto, Cinque; Todd, John-Paul; Shen, Chen-Hsiang; Tsybovsky, Yaroslav; Yang, Yongping; Zhao, Peng; Haynes, Barton F.; Stamatatos, Leonidas; Tiemeyer, Michael; Wells, Lance; Scorpio, Diana G.; Shapiro, Lawrence; McDermott, Adrian B.; Mascola, John R.; Kwong, Peter D.

    2017-04-01

    While the HIV-1-glycan shield is known to shelter Env from the humoral immune response, its quantitative impact on antibody elicitation has been unclear. Here, we use targeted deglycosylation to measure the impact of the glycan shield on elicitation of antibodies against the CD4 supersite. We engineered diverse Env trimers with select glycans removed proximal to the CD4 supersite, characterized their structures and glycosylation, and immunized guinea pigs and rhesus macaques. Immunizations yielded little neutralization against wild-type viruses but potent CD4-supersite neutralization (titers 1: >1,000,000 against four-glycan-deleted autologous viruses with over 90% breadth against four-glycan-deleted heterologous strains exhibiting tier 2 neutralization character). To a first approximation, the immunogenicity of the glycan-shielded protein surface was negligible, with Env-elicited neutralization (ID50) proportional to the exponential of the protein-surface area accessible to antibody. Based on these high titers and exponential relationship, we propose site-selective deglycosylated trimers as priming immunogens to increase the frequency of site-targeting antibodies.

  1. Duration of neutralizing antibody persisting in Thai individuals after childhood vaccination against smallpox.

    Science.gov (United States)

    Kwanchum, Kannikar; Ampol, Silawun; Thongput, Anchalee; Horthongkham, Navin; Udomphunthurak, Suthiphol; Siritantikorn, Sontana; Kantakamalakul, Wannee

    2017-06-01

    Although smallpox was completely eliminated by 1980, it remains possible that variola virus could be intentionally released in an act of bioterrorism. Thus, several studies have been performed to detect antibody levels after smallpox vaccination of the current population in various countries to indicate the duration of maintenance of immunological memory. Our study endeavored to investigate the level of neutralizing (Nt) antibody responses of Thai individuals who had been immunized with smallpox vaccine during childhood. The plaque reduction neutralization test (PRNT) was used to study vaccinia Nt antibody responses in sera of individuals ranging in age from 35-4, 45-54, 55-64, 65-74, 75-84 and > 84 years old, referred to as groups 1-6, respectively. Each group included 200 sera: 100 male sera and 100 female sera. An incubation time of 15 hours for sera and vaccinia virus was confirmed to be the optimal incubation period for PRNT. Positive Nt antibody titers (≥32) were detected in 135 (11.25%) of 1,200 sera: 81 (6.75%) male sera and 54 (4.5%) female sera. There were 4 (2%), 11 (5.5%), 19 (9.5%), 16 (8%), 33 (16.5%), and 52 (26%) positive sera in groups 1-6, respectively. Interestingly, the oldest individual with positive Nt antibody was a 98-year-old female. Two males aged 96 and 91 years old had the highest Nt antibody titers. Our data suggests that the vaccinia-specific Nt antibody response in the current Thai population could be maintained for more than 90 years after vaccination. However, the majority of the Thai population aged ≥35-74 years old is still highly susceptible to infection.

  2. Immunofluorescence tests for HIV antibody and their value as confirmatory tests.

    Science.gov (United States)

    van der Groen, G; Vercauteren, G; Piot, P

    1987-08-01

    The enzyme-linked immunosorbent assay (ELISA) is currently being used as a sensitive screening test for HIV antibody. The immunoblot assay (IBA) and indirect immunofluorescence (IF) techniques are two recommended confirmation tests for EIA-positive sera. An indirect IF test has been developed by various laboratories using acetone fixed mixtures of uninfected and HIV-infected cells, which facilitated the reading, since nonspecific reactions were easily differentiated from specific staining. Similar results have been obtained with H9-, CEM-, and HUT78-HIV-infected and uninfected cells. Anti-nuclear antibodies and auto-antibodies resulting in false-positive EIA results, could easily be differentiated by the IF test. Aspecific fluorescence can be removed by absorption of the specimens with non-infected cells. However, IF is not suitable for the screening of large series of specimens. IF is especially well suited for quantitative analysis of serum antibody levels. Whereas serum antibody titers rise initially after infection, they decrease as AIDS develops. Heat inactivation of sera did not affect reactivity in IF, in contrast to a high rate of false-positive results obtained with heat inactivated sera in some ELISAs. A well characterized serum from an AIDS patient can be used to perform IF in order to monitor HIV infection of susceptible cells. It has been claimed that titers of neutralizing antibodies significantly correlate with the levels of IF anti-HIV antibodies. An overall correlation of 99% between IF and IBA was reported by different laboratories, when HIV ELISA-reactive European and North American sera were tested. The concordance with IBA was 97% when HIV ELISA-reactive African sera were tested.(ABSTRACT TRUNCATED AT 250 WORDS)

  3. ICARE improves antinuclear antibody detection by overcoming the barriers preventing accreditation.

    Science.gov (United States)

    Bertin, Daniel; Mouhajir, Yassin; Bongrand, Pierre; Bardin, Nathalie

    2016-02-15

    Antinuclear antibodies (ANA) are useful biomarkers for the diagnosis and the monitoring of rheumatic diseases. The American College of Rheumatology has stated that indirect immunofluorescence (IIF) analysis remains the gold standard for ANA screening. However, IIF is time consuming, subjective, not fully standardized and presents several issues for accreditation which is the process leading to ISO 15189 certification for medical laboratories. We propose an innovative tool for accreditation by using the quantitative evaluation of the automated image capture and analysis "ICARE" (Immunofluorescence for Computed Antinuclear antibody Rational Evaluation). We established the optimal screening dilution (1:160) and a fluorescence index (FI) cutoff for ICARE on a cohort of 91 healthy blood donors. Then, we evaluated performance of ICARE on a routine cohort of 236 patients. Precision parameters of ANA detection by IIF were evaluated according to ISO 15189. ICARE showed an excellent concordance with visual evaluation (88%, Kappa=0.76) and significantly discriminated between weak to moderate (1:160-1:320 titers) and high (>1:320 titers) ANA levels. A significant correlation was found between FI and ANA titers (Spearman's ρ=0.67; P15189 standards. ICARE offers a precious help for the accreditation of IIF qualitative methods. This innovative quantitative approach is in adequacy with the process of continuous improvement of the quality of clinical laboratories. Copyright © 2015 Elsevier B.V. All rights reserved.

  4. Monoclonal antibody "gold rush".

    Science.gov (United States)

    Maggon, Krishan

    2007-01-01

    The market, sales and regulatory approval of new human medicines, during the past few years, indicates increasing number and share of new biologics and emergence of new multibillion dollar molecules. The global sale of monoclonal antibodies in 2006 were $20.6 billion. Remicade had annual sales gain of $1 billion during the past 3 years and five brands had similar increase in 2006. Rituxan with 2006 sales of $4.7 billion was the best selling monoclonal antibody and biological product and the 6th among the top selling medicinal brand. It may be the first biologic and monoclonal antibody to reach $10 billion annual sales in the near future. The strong demand from cancer and arthritis patients has surpassed almost all commercial market research reports and sales forecast. Seven monoclonal antibody brands in 2006 had sales exceeding $1 billion. Humanized or fully human monoclonal antibodies with low immunogenicity, enhanced antigen binding and reduced cellular toxicity provide better clinical efficacy. The higher technical and clinical success rate, overcoming of technical hurdles in large scale manufacturing, low cost of market entry and IND filing, use of fully human and humanized monoclonal antibodies has attracted funds and resources towards R&D. Review of industry research pipeline and sales data during the past 3 years indicate a real paradigm shift in industrial R&D from pharmaceutical to biologics and monoclonal antibodies. The antibody bandwagon has been joined by 200 companies with hundreds of new projects and targets and has attracted billions of dollars in R&D investment, acquisitions and licensing deals leading to the current Monoclonal Antibody Gold Rush.

  5. HIV-1 binding and neutralizing antibodies of injecting drug users

    Directory of Open Access Journals (Sweden)

    E.P. Ouverney

    2005-09-01

    Full Text Available Previous studies have demonstrated a stronger seroreactivity against some synthetic peptides responsible for inducing neutralizing antibodies in injecting drug users (IDU compared to that of individuals sexually infected with HIV-1 (S, but the effectiveness in terms of the neutralizing ability of these antibodies has not been evaluated. Our objective was to study the humoral immune response of IDU by determining the specificity of their antibodies and the presence of neutralizing antibodies. The neutralization capacity against the HIV-1 isolate MN (genotype B, the primary HIV-1 isolate 95BRRJ021 (genotype F, and the seroreactivity with peptides known to induce neutralizing antibodies, from the V2 and V3 loops of different HIV-1 subtypes, were analyzed. Seroreactivity indicates that IDU plasma are more likely to recognize a broader range of peptides than S plasma, with significantly higher titers, especially of V3 peptides. Similar neutralization frequencies of the MN isolate were observed in plasma of the IDU (16/47 and S (20/60 groups in the 1:10 dilution. The neutralization of the 95BRRJ021 isolate was more frequently observed for plasma from the S group (15/23 than from the IDU group (15/47, P = 0.0108. No correlation between neutralization and seroreactivity with the peptides tested was observed. These results suggest that an important factor responsible for the extensive and broad humoral immune response observed in IDU is their infection route. There was very little difference in neutralizing antibody response between the IDU and S groups despite their differences in seroreactivity and health status.

  6. Effects of stress temperatures of germination on polyamine titers of soybean seeds

    Science.gov (United States)

    Pineda-Mejia, Renan

    High and low stress temperatures during seed germination and seedling development limit total germination and the rate of germination and growth. Changes in polyamine (PA) concentrations in seeds of different species have been associated with germination, growth and environmental stresses such as temperature, drought, oxygen, chilling injury and osmotic conditions. Two studies were conducted to determine the effect of stress temperatures during germination and seedling development on polyamine titers in soybean seeds. Three germination temperatures, 25, 30, and 36°C were used in the first study to evaluate their influence on changes in polyamine concentrations in soybean seeds germinated at 76 and 90 hours. The polyamines (PAs), cadaverine (Cad), putrescine (Put), spermidine (Spd), agmatine (Agm), and spermine (Spin) were quantified by HPLC using a cation exchange column and an electrochemical detector. Cad, Put, Agm, and Spd declined as the germination temperatures increased from 25 to 36°C. Conversely, Spin increased considerably with an increase in temperature. Total germination was reduced from 97.2 to 92.5% as germination temperatures increased from 25 to 36°C. Germination time did not affect Cad, Agm and Spm, and total germination, however, the interaction between temperature and germination time for Put and Spd concentrations was significant. In the second study, changes in PA concentrations, seedling growth, germination time (t50), fresh and dry weight, and moisture content were measured in the embryonic axis and cotyledons of soybean seeds germinated at 10 and 25°C through six stages of germination dry seed (DS), testa split (TS), radicle at 10 mm (Ra-10), root hairs visible (RHV), secondary root primordia (SRP), and complete seedling (CS). The concentrations of Cad and Put in the embryonic axis, were significantly higher in seeds germinated under low temperature than in seeds at 25°C (approximately 10 and 3 fold respectively). However, this

  7. HPV16/18 L1 VLP Vaccine Induces Cross-Neutralizing Antibodies that May Mediate Cross-Protection

    OpenAIRE

    Kemp, Troy J; Hildesheim, Allan; Safaeian, Mahboobeh; Dauner, Joseph G.; Pan, Yuanji; Porras, Carolina; Schiller, John T.; Lowy, Douglas R.; Herrero, Rolando; Pinto, Ligia A

    2011-01-01

    Human papillomavirus (HPV) L1 VLP-based vaccines are protective against HPV vaccine-related types; however, the correlates of protection have not been defined. We observed that vaccination with Cervarix™ induced cross-neutralizing antibodies for HPV types for which evidence of vaccine efficacy has been demonstrated (HPV31/45) but not for other types (HPV52/58). In addition, HPV31/45 cross-neutralizing titers showed a significant increase with number of doses (HPV31, p

  8. Antibody responses against xenotropic murine leukemia virus-related virus envelope in a murine model.

    Directory of Open Access Journals (Sweden)

    Natalia Makarova

    2011-04-01

    Full Text Available Xenotropic murine leukemia virus-related virus (XMRV was recently discovered to be the first human gammaretrovirus that is associated with chronic fatigue syndrome and prostate cancer (PC. Although a mechanism for XMRV carcinogenesis is yet to be established, this virus belongs to the family of gammaretroviruses well known for their ability to induce cancer in the infected hosts. Since its original identification XMRV has been detected in several independent investigations; however, at this time significant controversy remains regarding reports of XMRV detection/prevalence in other cohorts and cell type/tissue distribution. The potential risk of human infection, coupled with the lack of knowledge about the basic biology of XMRV, warrants further research, including investigation of adaptive immune responses. To study immunogenicity in vivo, we vaccinated mice with a combination of recombinant vectors expressing codon-optimized sequences of XMRV gag and env genes and virus-like particles (VLP that had the size and morphology of live infectious XMRV.Immunization elicited Env-specific binding and neutralizing antibodies (NAb against XMRV in mice. The peak titers for ELISA-binding antibodies and NAb were 1:1024 and 1:464, respectively; however, high ELISA-binding and NAb titers were not sustained and persisted for less than three weeks after immunizations.Vaccine-induced XMRV Env antibody titers were transiently high, but their duration was short. The relatively rapid diminution in antibody levels may in part explain the differing prevalences reported for XMRV in various prostate cancer and chronic fatigue syndrome cohorts. The low level of immunogenicity observed in the present study may be characteristic of a natural XMRV infection in humans.

  9. Association of serum antibodies with protection against rotavirus infection and disease in South Indian children.

    Science.gov (United States)

    Premkumar, Prasanna; Lopman, Ben; Ramani, Sasirekha; Paul, Anu; Gladstone, Beryl; Muliyil, Jayaprakash; Mukhopadhya, Indrani; Parashar, Umesh; Kang, Gagandeep

    2014-08-11

    Serum antibodies play an important role in natural protection from rotavirus infection and disease, but conflicting estimates of association have emerged from epidemiological studies in different geographical settings. In this study, we aim to assess the relationship between pre-existing serum immunoglobulin (Ig)G and IgA titers with protection against rotavirus infection and disease in a birth cohort of Indian children. Children were recruited at birth and followed up for 36 months. Stool samples were collected every 2 weeks and during episodes of diarrhea and serum samples were obtained at least every 6 months. The incidence rate of rotavirus infection and diarrhea was 0.9 (95% CI: 0.88, 0.99) and 0.2 (95% CI: 0.19, 0.25) episodes per child year, respectively. The risk of rotavirus infection and diarrhea decreased with age, while antibody titers (IgG and IgA) increased with age. After adjusting for age and number of previous infections, higher levels of IgG and IgA were independently associated with reduced risk of rotavirus infection. However, we did not find a clear association of IgG or IgA with rotavirus diarrhea risk or a threshold level of protection. The study supports a correlation of serum antibodies in reducing the risk of rotavirus infections, however the potential of serum antibody titer as a correlate of protection is not clear for children in lower income settings. Copyright © 2014 The Authors. Published by Elsevier Ltd.. All rights reserved.

  10. Thyroid Autoimmunity: Role of Anti-thyroid Antibodies in Thyroid and Extra-Thyroidal Diseases

    Science.gov (United States)

    Fröhlich, Eleonore; Wahl, Richard

    2017-01-01

    Autoimmune diseases have a high prevalence in the population, and autoimmune thyroid disease (AITD) is one of the most common representatives. Thyroid autoantibodies are not only frequently detected in patients with AITD but also in subjects without manifest thyroid dysfunction. The high prevalence raises questions regarding a potential role in extra-thyroidal diseases. This review summarizes the etiology and mechanism of AITD and addresses prevalence of antibodies against thyroid peroxidase, thyroid-stimulating hormone receptor (TSHR), and anti-thyroglobulin and their action outside the thyroid. The main issues limiting the reliability of the conclusions drawn here include problems with different specificities and sensitivities of the antibody detection assays employed, as well as potential confounding effects of altered thyroid hormone levels, and lack of prospective studies. In addition to the well-known effects of TSHR antibodies on fibroblasts in Graves’ disease (GD), studies speculate on a role of anti-thyroid antibodies in cancer. All antibodies may have a tumor-promoting role in breast cancer carcinogenesis despite anti-thyroid peroxidase antibodies having a positive prognostic effect in patients with overt disease. Cross-reactivity with lactoperoxidase leading to induction of chronic inflammation might promote breast cancer, while anti-thyroid antibodies in manifest breast cancer might be an indication for a more active immune system. A better general health condition in older women with anti-thyroid peroxidase antibodies might support this hypothesis. The different actions of the anti-thyroid antibodies correspond to differences in cellular location of the antigens, titers of the circulating antibodies, duration of antibody exposure, and immunological mechanisms in GD and Hashimoto’s thyroiditis. PMID:28536577

  11. TITRATION METHOD OF AB0 ANTIBODIES WITH THE USE OF MODERN GEL TECHNOLOGY IN AB0-INCOMPATIBLE TRANSPLANTATION

    Directory of Open Access Journals (Sweden)

    A. K. Porunova

    2014-01-01

    Full Text Available It is shown that developed method of titrating AB0 antibodies allows defi ning the titer of the investigational antibodies more precisely on 1–3 dilution of serum compared to the prototype method (titration method of antibodiesin saline medium on the plane. It is more obvious as it excludes hardly interpretable results due to the possibility of conducting visual assessment of agglutination reaction in the gel card thick column and requires less time foranalysis. The results can be saved for comparison with the results of further research. That is not possible under prototype titration method. Aim: our aim is to create a laboratory technique that can accurately, reliably and clearly produce titration of AB0 system antibodies, including in patients with low initial concentration of agglutinins in the blood; a technique more economical in terms of spending serum and that takes less time.Materials and methods: those modes were empirically chosen which allow titration of AB0 system agglutinins using gel technology based micro typing; to titer group antibodies 1640 serum assays of recipients in AB0-incompatibletransplantation were analyzed.The result of the use of specially developed method in organ transplantation from incompatible blood donors consists in enhancing accuracy, sensitivity of natural, complete and incomplete AB0 system immune antibodies titration, in its clarity, using of blood micro-doses for earlier detection of sensitizing of the patient, which is especially important in Pediatrics. Conclusion: the developed procedure of AB0-antibodies’ titration using modern gel technology makes possible a more precise monitoring of the titer of antibodies that is necessary to predict the graft rejection risk, to select the Protocol of preoperative preparation and postoperative management of patients, to assess the effectiveness of therapy in patients for whom it is diffi cult to fi nd a compatible blood type donor, and for whom today AB

  12. Antibodies against rabies virus in dogs with and without history of vaccination in Santa Maria - RS - Brazil

    Directory of Open Access Journals (Sweden)

    Karina Gonzalez Fernandes

    2017-10-01

    Full Text Available ABSTRACT: The present study investigated the frequency and magnitude of neutralizing antibodies to rabies virus (RABV in dogs with and without historic of vaccination in Santa Maria/RS. Group A included serum samples from 440 dogs with recent historic of vaccination against rabies, obtained during the 2015 rabies vaccination campaign. Group B included 300 serum samples from dogs submitted to the Veterinary Hospital of the Universidade Federal de Santa Maria in 2015, whose historic of rabies vaccination was unknown. Serum samples were submitted to the rapid fluorescent focus inhibition test (RFFIT to detect neutralizing antibodies against RABV. In group A, 70.6% (310/440 of the samples had neutralizing antibody titers ≥0.5 international units per milliliter (IU mL-1, considered an indicative of protection against rabies by the World Health Organization. However, approximately 30% of the dogs did not contain antibodies in adequate levels. In group B, 42.3% (127/300 of the samples contained neutralizing antibody titers ≥0.5IU mL-1 and 57.7% (173/300 were negative or contained titers below of the value considered immunized. These results demonstrate that an important proportion of vaccinated dogs (~30% did not develop adequate antibody levels, mainly those receiving a single vaccine dose. Serologic testing of animals with unknown historic of vaccination revealed relatively low vaccine coverage in the general dog population. Thus, reformulation of immunization strategies - especially the recommendation of a boost vaccination 30 days after the primary dose - and extension of vaccination campaigns are necessary to reach adequate levels and coverage of immunity against RABV in the canine population.

  13. Antithyroid microsomal antibody

    Science.gov (United States)

    ... to confirm the cause of thyroid problems, including Hashimoto thyroiditis . The test is also used to find ... positive test may be due to: Granulomatous thyroiditis Hashimoto thyroiditis High levels of these antibodies have also ...

  14. Serum herpes simplex antibodies

    Science.gov (United States)

    ... causes cold sores (oral herpes). HSV-2 causes genital herpes. How the Test is Performed A blood sample ... person has ever been infected with oral or genital herpes . It looks for antibodies to herpes simplex virus ...

  15. ANA (Antinuclear Antibody Test)

    Science.gov (United States)

    ... Testing Leptin Levetiracetam Lipase Lipid Profile Lipoprotein (a) Lithium Liver Panel Lp-PLA2 Lupus Anticoagulant Testing Luteinizing ... Scleroderma Elsewhere On The Web Lupus Foundation of America American College of Rheumatology: Antinuclear Antibodies (ANA) American ...

  16. Anti-sulfotyrosine antibodies

    Energy Technology Data Exchange (ETDEWEB)

    Bertozzi, Carolyn R [Berkeley, CA; Kehoe, John [Saint Davids, PA; Bradbury, Andrew M [Santa Fe, NM

    2009-09-15

    The invention provides anti-sulfotyrosine specific antibodies capable of detecting and isolating polypeptides that are tyrosine-sulfated. The sulfotyrosine antibodies and antibody fragments of the invention may be used to discriminate between the non-sulfated and sulfated forms of such proteins, using any number of immunological assays, such ELISAs, immunoblots, Western Blots, immunoprecipitations, and the like. Using a phage-display system, single chain antibodies (scFvs) were generated and screened against tyrosine-sulfated synthetic peptide antigens, resulting in the isolation of scFvs that specifically recognize sulfotyrosine-containing peptides and/or demonstrate sulfotyrosine-specific binding in tyrosine sulfated proteins. The VH and VL genes from one such sulfotyrosine-specific scFv were employed to generate a full length, sulfotyrosine-specific immunoglobulin.

  17. Antibody Blood Tests

    Science.gov (United States)

    Antibody Blood Tests Researchers have discovered that people with celiac disease who eat gluten have higher than normal levels of ... do I do if I have a negative blood test (or panel) but I’m still having symptoms? ...

  18. Broadly-Reactive Neutralizing and Non-neutralizing Antibodies Directed against the H7 Influenza Virus Hemagglutinin Reveal Divergent Mechanisms of Protection.

    Directory of Open Access Journals (Sweden)

    Gene S Tan

    2016-04-01

    Full Text Available In the early spring of 2013, Chinese health authorities reported several cases of H7N9 influenza virus infections in humans. Since then the virus has established itself at the human-animal interface in Eastern China and continues to cause several hundred infections annually. In order to characterize the antibody response to the H7N9 virus we generated several mouse monoclonal antibodies against the hemagglutinin of the A/Shanghai/1/13 (H7N9 virus. Of particular note are two monoclonal antibodies, 1B2 and 1H5, that show broad reactivity to divergent H7 hemagglutinins. Monoclonal antibody 1B2 binds to viruses of the Eurasian and North American H7 lineages and monoclonal antibody 1H5 reacts broadly to virus isolates of the Eurasian lineage. Interestingly, 1B2 shows broad hemagglutination inhibiting and neutralizing activity, while 1H5 fails to inhibit hemagglutination and demonstrates no neutralizing activity in vitro. However, both monoclonal antibodies were highly protective in an in vivo passive transfer challenge model in mice, even at low doses. Experiments using mutant antibodies that lack the ability for Fc/Fc-receptor and Fc/complement interactions suggest that the protection provided by mAb 1H5 is, at least in part, mediated by the Fc-fragment of the mAb. These findings highlight that a protective response to a pathogen may not only be due to neutralizing antibodies, but can also be the result of highly efficacious non-neutralizing antibodies not readily detected by classical in vitro neutralization or hemagglutination inhibition assays. This is of interest because H7 influenza virus vaccines induce only low hemagglutination inhibiting antibody titers while eliciting robust antibody titers as measured by ELISA. Our data suggest that these binding but non-neutralizing antibodies contribute to protection in vivo.

  19. Expression of Recombinant Antibodies

    OpenAIRE

    André eFrenzel; Michael eHust; Thomas eSchirrmann

    2013-01-01

    Recombinant antibodies are highly specific detection probes in research, diagnostics, and have emerged over the last two decades as the fastest growing class of therapeutic proteins. Antibody generation has been dramatically accelerated by in vitro selection systems, particularly phage display. An increasing variety of recombinant production systems have been developed, ranging from Gram-negative and positive bacteria, yeasts and filamentous fungi, insect cell lines, mammalian cells to transg...

  20. Rabies-Specific Antibodies: Measuring Surrogates of Protection against a Fatal Disease

    Science.gov (United States)

    Moore, Susan M.; Hanlon, Cathleen A.

    2010-01-01

    Antibodies play a central role in prophylaxis against many infectious agents. While neutralization is a primary function of antibodies, the Fc- and complement-dependent activities of these multifunctional proteins may also be critical in their ability to provide protection against most viruses. Protection against viral pathogens in vivo is complex, and while virus neutralization—the ability of antibody to inactivate virus infectivity, often measured in vitro—is important, it is often only a partial contributor in protection. The rapid fluorescent focus inhibition test (RFFIT) remains the “gold standard” assay to measure rabies virus–neutralizing antibodies. In addition to neutralization, the rabies-specific antigen-binding activity of antibodies may be measured through enzyme-linked immunosorbent assays (ELISAs), as well as other available methods. For any disease, in selecting the appropriate assay(s) to use to assess antibody titers, assay validation and how they are interpreted are important considerations—but for a fatal disease like rabies, they are of paramount importance. The innate limitations of a one-dimensional laboratory test for rabies antibody measurement, as well as the validation of the method of choice, must be carefully considered in the selection of an assay method and for the interpretation of results that might be construed as a surrogate of protection. PMID:20231877

  1. Antiphospholipid antibodies and non-thrombotic manifestations of systemic lupus erythematosus.

    Science.gov (United States)

    İlgen, U; Yayla, M E; Ateş, A; Okatan, İ E; Yurteri, E U; Torgutalp, M; Keleşoğlu, A B D; Turgay, T M; Kınıklı, G

    2017-01-01

    Objectives The aim of this study was to investigate the association between antiphospholipid antibodies and non-thrombotic and non-gestational manifestations of systemic lupus erythematosus. Methods Systemic lupus erythematosus patients with persistently positive antiphospholipid antibodies or lupus anticoagulant were identified and grouped as systemic lupus erythematosus with antiphospholipid syndrome (SLE-APS), systemic lupus erythematosus with positive antiphospholipid antibodies/lupus anticoagulant without antiphospholipid syndrome (SLE-aPL), and systemic lupus erythematosus with negative aPLs (SLE-No aPL). Groups were compared in terms of non-thrombotic systemic lupus erythematosus manifestations and laboratory features retrospectively. Results A total of 150 systemic lupus erythematosus patients, 26 with SLE-APS, 25 with SLE-aPL, and 99 with SLE-No aPL, were identified. Livedo reticularis, neurologic involvement, and thrombocytopenia were more common in antiphospholipid antibody positive systemic lupus erythematosus cases. Malar rash, arthritis, and pleuritis were more common in the SLE-No aPL, SLE-APS, and SLE-aPL groups, respectively. Positivity rates and titers of specific antiphospholipid antibodies did not differ between the SLE-APS and SLE-aPL groups. Conclusions Presence of antiphospholipid syndrome or persistent antiphospholipid antibodies may be related to non-thrombotic and non-gestational systemic lupus erythematosus manifestations. Patients with systemic lupus erythematosus plus antiphospholipid syndrome and persistent antiphospholipid antibodies without antiphospholipid syndrome also differ in terms of systemic lupus erythematosus manifestations.

  2. Soluble HIV-1 Envelope Immunogens Derived from an Elite Neutralizer Elicit Cross-Reactive V1V2 Antibodies and Low Potency Neutralizing Antibodies

    Science.gov (United States)

    Glenn, Jolene; Stamatatos, Leonidas; Sather, D. Noah

    2014-01-01

    We evaluated four gp140 Envelope protein vaccine immunogens that were derived from an elite neutralizer, subject VC10042, whose plasma was able to potently neutralize a wide array of genetically distinct HIV-1 isolates. We sought to determine whether soluble Envelope proteins derived from the viruses circulating in VC10042 could be used as immunogens to elicit similar neutralizing antibody responses by vaccination. Each gp140 was tested in its trimeric and monomeric forms, and we evaluated two gp140 trimer vaccine regimens in which adjuvant was supplied at all four immunizations or at only the first two immunizations. Interestingly, all four Envelope immunogens elicited high titers of cross-reactive antibodies that recognize the variable regions V1V2 and are potentially similar to antibodies linked with a reduced risk of HIV-1 acquisition in the RV144 vaccine trial. Two of the four immunogens elicited neutralizing antibody responses that neutralized a wide array of HIV-1 isolates from across genetic clades, but those responses were of very low potency. There were no significant differences in the responses elicited by trimers or monomers, nor was there a significant difference between the two adjuvant regimens. Our study identified two promising Envelope immunogens that elicited anti-V1V2 antibodies and broad, but low potency, neutralizing antibody responses. PMID:24466285

  3. Anti-Leptospira spp. antibodies in Crotalus durissus collilineatus kept in captivity and its zoonotic relevance.

    Science.gov (United States)

    Rodrigues, T C S; Santos, A L Q; Lima, A M C; Gomes, D O; Brites, V L C

    2016-06-01

    Leptospirosis is a worldwide spread zoonosis that can affect all groups of vertebrates, including reptiles. Because it has been little studied in snakes, this study focused on determining the occurrence of anti-Leptospira spp. antibodies in 64 Crotalus durissus collilineatus kept in captivity and on identifying the most common serovars in these animals, using the microscopic agglutination test. Of these, almost 90% were positive and there were reactions to the 22 serovars used in the study. The most common serovar in these snakes was Javanica, Andamana and Patoc. Most frequent titers were 25 and 50, although high titers (such as 1600) were also recorded, despite the absence of clinical symptoms. The possibility should be considered of captive snakes serving as a serious source of leptospiral infection in humans, which is why it is essential to study, prevent and control the disease in breeding centers and serpentariums. Copyright © 2016 Elsevier B.V. All rights reserved.

  4. Neutralizing Antibodies Against Adeno-Associated Virus (AAV): Measurement and Influence on Retinal Gene Delivery.

    Science.gov (United States)

    Desrosiers, Mélissa; Dalkara, Deniz

    2018-01-01

    Adeno-associated viral vectors have become widely used in the clinic for retinal gene therapy. Thanks to AAVs impeccable safety profile and positive functional outcomes in its clinical application, interest in retinal gene therapy has increased exponentially over the past decade. Although early clinical trials have shown there is little influence of neutralizing antibodies on the performance of AAV when vector is administered into the subretinal space, recent findings suggest neutralizing antibodies may play a role when AAV is delivered via the intravitreal route. These findings highlight the importance of microenvironment on gene delivery and stress the need for a versatile assay to screen subjects for the presence of AAV-neutralizing antibodies. Measuring NAb titers against AAV prior and after gene therapy will help us better understand the impact of preexisting immunity on gene transfer, especially when the vector is administered intravitreally.

  5. Anticorpos contra o citoplasma de neutrófilos Antineutrophil cytoplasmic antibodies

    Directory of Open Access Journals (Sweden)

    Ari Stiel Radu

    2005-07-01

    Full Text Available A descoberta do marcador sorológico denominado anticorpo anticitoplasma de neutrófilos revolucionou o diagnóstico e o seguimento das vasculites pulmonares, especialmente da granulomatose de Wegener. Seu padrão pode ser citoplasmático e perinuclear. Sua titulação auxilia no diagnóstico e no seguimento das vasculites pulmonares.The discovery of the serological markers known as antineutrophil cytoplasmic antibodies revolutionized the diagnosis and follow-up treatment of the various forms of pulmonary vasculitis, especially that of Wegener's granulomatosis. The antineutrophil cytoplasmic antibodies pattern can be cytoplasmic or perinuclear. Determination of antineutrophil cytoplasmic antibodies titers aids the diagnosis and follow-up treatment of pulmonary vasculitis.

  6. A liquid phase blocking ELISA for the detection of antibodies against infectious bronchitis virus

    Directory of Open Access Journals (Sweden)

    Cardoso T.C.

    1999-01-01

    Full Text Available A liquid phase blocking ELISA (LPB-ELISA was developed for the detection and measurement of antibodies against infectious bronchitis virus (IBV. The purified and nonpurified virus used as antigen, the capture and detector antibodies, and the chicken hyperimmune sera were prepared and standardized for this purpose. A total of 156 sera from vaccinated and 100 from specific pathogen-free chickens with no recorded contact with the virus were tested. The respective serum titers obtained in the serum neutralization test (SNT were compared with those obtained in the LPB-ELISA. There was a high correlation (r2 = 0.8926 between the two tests. The LPB-ELISA represents a single test suitable for the rapid detection of antibodies against bronchitis virus in chicken sera, with good sensitivity (88%, specificity (100% and agreement (95.31%.

  7. Prevalence of antibodies to Japanese encephalitis virus among pigs in Bali and East Java, Indonesia, 2008.

    Science.gov (United States)

    Yamanaka, Atsushi; Mulyatno, Kris Cahyo; Susilowati, Helen; Hendrianto, Eryk; Utsumi, Takako; Amin, Mochamad; Lusida, Maria Inge; Soegijanto, Soegeng; Konishi, Eiji

    2010-01-01

    Japanese encephalitis virus (JEV) is a fatal disease in Asia. Pigs are considered to be the effective amplifying host for JEV in the peridomestic environment. Bali Island and Java Island in Indonesia provide a model to assess the effect of pigs on JEV transmission, since the pig density is nearly 100-fold higher in Bali than Java, while the geographic and climatologic environments are equivalent in these areas. We surveyed antibodies to JEV among 123 pigs in Mengwi (Bali) and 96 pigs in Tulungagung (East Java) in 2008 by the hemagglutination-inhibition (HAI) test. Overall prevalences were 49% in Bali and 6% in Java, with a significant difference between them (P Java. In addition, 2-mercaptoethanol-sensitive antibodies were found only from Bali samples. Further, the average HAI antibody titer obtained from positive samples was significantly higher in Bali (1:52) than Java (1:10; P Java.

  8. Robust real-time cell analysis method for determining viral infectious titers during development of a viral vaccine production process.

    Science.gov (United States)

    Charretier, Cédric; Saulnier, Aure; Benair, Loïc; Armanet, Corinne; Bassard, Isabelle; Daulon, Sandra; Bernigaud, Bertrand; Rodrigues de Sousa, Emanuel; Gonthier, Clémence; Zorn, Edouard; Vetter, Emmanuelle; Saintpierre, Claire; Riou, Patrice; Gaillac, David

    2018-02-01

    The classical cell-culture methods, such as cell culture infectious dose 50% (CCID50) assays, are time-consuming, end-point assays currently used during the development of a viral vaccine production process to measure viral infectious titers. However, they are not suitable for handling the large number of tests required for high-throughput and large-scale screening analyses. Impedance-based bio-sensing techniques used in real-time cell analysis (RTCA) to assess cell layer biological status in vitro, provide real-time data. In this proof-of-concept study, we assessed the correlation between the results from CCID50 and RTCA assays and compared time and costs using monovalent and tetravalent chimeric yellow fever dengue (CYD) vaccine strains. For the RTCA assay, Vero cells were infected with the CYD sample and real-time impedance was recorded, using the dimensionless cell index (CI). The CI peaked just after infection and decreased as the viral cytopathic effect occurred in a dose-dependent manner. The time to the median CI (CITmed) was correlated with viral titers determined by CCID50 over a range of about 4-5log10 CCID50/ml. This in-house RTCA virus-titration assay was shown to be a robust method for determining real-time viral infectious titers, and could be an alternative to the classical CCID50 assay during the development of viral vaccine production process. Copyright © 2017 The Authors. Published by Elsevier B.V. All rights reserved.

  9. Developmental ecdysteroid titers and DNA puffs in larvae of two sciarid species, Rhynchosciara americana and Rhynchosciara milleri (Diptera: Sciaridae).

    Science.gov (United States)

    Soares, M A M; Hartfelder, K; Tesserolli de Souza, J M; Stocker, A J

    2015-10-01

    Ecdysteroid titers, developmental landmarks and the presence of prominent amplifying regions (DNA puffs) have been compared during late larval to pupal development in four groups of Rhynchosciara americana larvae and in R. americana and Rhynchosciara milleri. Three prominent DNA puffs (B2, C3 and C8) expand and regress sequentially on the rising phase of the 20-hydroxyecdysone (20E) titer in R. americana as a firm, cellular cocoon is being constructed. A sharp rise in 20E coincides with the regression of these puffs. The shape of the 20E curve is similar in R. milleri, a species that does not construct a massive cocoon, but the behavior of certain DNA puffs and their temporal relationship to the curve differs. Regions corresponding to B2 and C3 can be identified in R. milleri by banding pattern similarity with R. americana chromosomes and, in the case of B2, by hybridization to an R. americana probe. A B2 puff appears in R. milleri as the 20E titer rises but remains small in all gland regions. A puff similar to the R. americana C3 puff occurs in posterior gland cells of R. milleri (C3(Rm)) after the B2 puff, but this site did not hybridize to R. americana C3 probes. C3(Rm) incorporated (3)H-thymidine above background, but showed less post-puff DNA accumulation than C3 of R. americana. R. americana C8 probes hybridized to a more distal region of the R. milleri C chromosome that did not appear to amplify or form a large puff. These differences can be related to developmental differences, in particular differences in cocoon construction between the two species.

  10. High-titer measles vaccination before 9 months of age and increased female mortality: do we have an explanation?

    Science.gov (United States)

    Aaby, Peter; Jensen, Henrik; Simondon, Francois; Whittle, Hilton

    2003-07-01

    In 1989, high-titer (HT) Edmonston-Zagreb measles vaccine with a titer more than 10(4.7) plaque-forming-units was recommended by the World Health Organization for use in areas with a high incidence of measles in children younger than 9 months. In 1992, the recommendation was rescinded following reports from Guinea-Bissau, Senegal, and Haiti showing an increased incidence of female mortality occurring after administration of HT Edmonston-Zagreb vaccination. We reviewed 9 studies of HT measles vaccines that reported data on mortality. These reports included 4 randomized trials comparing HT vaccine administered to children younger than 9 months with standard-titer (ST) vaccines (10(3.0) to 10(4.0) plaque-forming-units) given at 9 months of age. Five studies from Zaire, Haiti, Senegal, Rwanda, and Zaire had no control group receiving ST vaccine at 9 months of age, but investigators were able to examine the female-to-male mortality ratio within these HT studies. Investigators have hypothesized that HT vaccine had caused immune suppression similar to that of measles infection. The present review suggests first that the HT vaccine itself is unlikely to be the cause because the effect was not found in all studies. Second, the increased mortality started only after 9 to 10 months of age when controls received ST measles vaccine, and HT groups received the "control vaccine." It was not found in the studies that provided another measles vaccine instead of control vaccine. Third, because the HT studies with excess mortality rates showed increased female mortality rates, we need to find environmental or contextual conditions associated with increased female mortality rates in some studies to explain the problem associated with HT measles vaccination.

  11. Quantification of anti-Leishmania antibodies in saliva of dogs.

    Science.gov (United States)

    Cantos-Barreda, Ana; Escribano, Damián; Bernal, Luis J; Cerón, José J; Martínez-Subiela, Silvia

    2017-08-15

    Detection of serum anti-Leishmania antibodies by quantitative or qualitative techniques has been the most used method to diagnose Canine Leishmaniosis (CanL). Nevertheless, saliva may represent an alternative to blood because it is easy to collect, painless and non-invasive in comparison with serum. In this study, two time-resolved immunofluorometric assays (TR-IFMAs) for quantification of anti-Leishmania IgG2 and IgA antibodies in saliva were developed and validated and their ability to distinguish Leishmania-seronegative from seropositive dogs was evaluated. The analytical study was performed by evaluation of assay precision, sensitivity and accuracy. In addition, serum from 48 dogs (21 Leishmania-seropositive and 27 Leishmania-seronegative) were analyzed by TR-IFMAs. The assays were precise, with an intra- and inter-assay coefficients of variation lower than 11%, and showed high level of accuracy, as determined by linearity under dilution (R2=0.99) and recovery tests (>88.60%). Anti-Leishmania IgG2 antibodies in saliva were significantly higher in the seropositive group compared with the seronegative (pLeishmania IgA antibodies between both groups were observed. Furthermore, TR-IFMA for quantification of anti-Leishmania IgG2 antibodies in saliva showed higher differences between seropositive and seronegative dogs than the commercial assay used in serum. In conclusion, TR-IFMAs developed may be used to quantify anti-Leishmania IgG2 and IgA antibodies in canine saliva with an adequate precision, analytical sensitivity and accuracy. Quantification of anti-Leishmania IgG2 antibodies in saliva could be potentially used to evaluate the humoral response in CanL. However, IgA in saliva seemed not to have diagnostic value for this disease. For future studies, it would be desirable to evaluate the ability of the IgG2 assay to detect dogs with subclinical disease or with low antibody titers in serum and also to study the antibodies behaviour in saliva during the treatment

  12. Rabbit and human antibodies to a repeated amino acid sequence of a Plasmodium falciparum antigen, Pf 155, react with the native protein and inhibit merozoite invasion.

    Science.gov (United States)

    Berzins, K; Perlmann, H; Wåhlin, B; Carlsson, J; Wahlgren, M; Udomsangpetch, R; Björkman, A; Patarroyo, M E; Perlmann, P

    1986-02-01

    The Plasmodium falciparum-derived antigen of Mr 155,000 designated Pf 155, deposited in the membrane of infected erythrocytes, contains at least two blocks of tandemly repeated amino acid sequences. The peptide Glu-Glu-Asn-Val-Glu-His-Asp-Ala, which corresponds to a subunit of a C-terminally located repeat, was synthesized. Rabbits immunized with the octapeptide conjugated with either keyhole limpet hemocyanine or tetanus toxoid formed antibodies against the octapeptide. These antibodies reacted with Pf 155 as detected by immunoblotting or a modified immunofluorescence assay. Sera from humans exposed to P. falciparum also contained antibodies binding to the octapeptide in a dot-blot immunoassay. Their anti-octapeptide titers were correlated with their immunofluorescence titers in the assay detecting Pf 155 and other parasite antigens in the membrane of infected erythrocytes. Human octapeptide-reactive antibodies were isolated on an affinity column with the octapeptide conjugated to bovine serum albumin as ligand. These human antibodies reacted with Pf 155 in immunoblotting and strongly stained the surface of infected erythrocytes in the modified immunofluorescence assay. Approximately 20% of this immunofluorescence activity in a high-titered human serum could be recovered from the octapeptide column, indicating that a significant fraction of these anti-parasite antibodies react with epitopes associated with the octapeptide. Furthermore, the human octapeptide-reactive antibodies very efficiently inhibited merozoite reinvasion into erythrocytes in vitro. Similarly purified rabbit antibodies also significantly inhibited reinvasion. Our results suggest that the C-terminal segment of repeated peptides in Pf 155 is a major antigenic region of the molecule and may contain target sites for protective immunity in P. falciparum malaria.

  13. Antibodies against vesicular stomatitis virus in horses from southern, midwestern and northeastern Brazilian States

    Directory of Open Access Journals (Sweden)

    Vinícius Leobet Lunkes

    2016-08-01

    Full Text Available ABSTRACT: Vesicular stomatitis virus (VSV is the agent of a vesicular disease that affects many animal species and may be clinically confounded with foot-and-mouth disease in ruminant and swine. Horses are especially susceptible to VSV and may serve as sentinels for virus circulation. The present study investigated the presence of neutralizing antibodies against VSV Indiana III (VSIV-3 in serum samples of 3,626 horses from six states in three Brazilian regions: Southern (RS, n = 1,011, Midwest (GO/DF, n = 1,767 and Northeast (PB, PE, RN and CE, n = 848 collected between 2013 and 2014. Neutralizing antibodies against VSIV-3 (titers ≥40 were detected in 641 samples (positivity of 17.7%; CI95%:16.5-19.0%, being 317 samples from CE (87.3%; CI95%: 83.4-90.5 %; 109 from RN (65.7%; CI95%: 57.8 -72.7%; 124 from PB (45.4%; CI95%: 39.4-51.5%; 78 from GO/DF (4.4%; CI95%: 3.5-5.5% and nine samples of RS (0.9%; CI95%: 0.4-1.7%. Several samples from the Northeast and Midwest harbored high neutralizing titers, indicating a recent exposure to the virus. In contrast, samples from RS had low titers, possibly due to a past remote exposure. Several positive samples presented neutralizing activity against other VSV serotypes (Indiana I and New Jersey, yet in lower titers, indicating the specificity of the response to VSIV-3. These results demonstrated a relatively recent circulation of VSIV-3 in northeastern Brazilian States, confirming clinical findings and demonstrating the sanitary importance of this infection.