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Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted Pandemic H1N1 (2009) Influenza Virus Vaccine

Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted... Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted Pandemic H1N1 (2009) Influenza Virus Vaccine Karen K. Yam a , Jyotsana Gupta a , Angela Brewer a , David W. Scheifele b , Scott Halperin c , Brian J. Ward a , d , Public Health Agency of Canada/Canadian Institute of Health Research, Influenza Research Network (PCIRN) Rapid Trial Study 3 (RT-03) Investigators Department of Experimental Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada a Vaccine Evaluation Centre, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada b Canadian Centre for Vaccinology, IWK Grace Hospital, Dalhousie University, Halifax, Nova Scotia, Canada c Vaccine Study Centre, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada d ABSTRACT During the 2009-2010 H1N1 influenza pandemic, an adjuvanted monovalent vaccine containing ∼25% of the normal antigen dose and AS03 adjuvant was widely used in Canada. This vaccine was found to be well-tolerated and immunogenic in young children (D. W. Scheifele et al., Pediatr. Infect. Dis. J. 30:402–407, 2011). We report here additional analyses to further characterize the humoral response to this vaccine. We measured standard hemagglutination inhibition (HAI) and microneutralization (MN) titers, as well as influenza virus-specific IgG avidity and subclass distribution by enzyme-linked immunosorbent assay in 73 subjects. Sera were collected before (day 0) and 3 weeks after each dose of vaccine (days 21 and 42). Most children (55/73) had undetectable HAI and MN titers at day 0 (presumed to be antigen naive) and mounted good responses at days 21 and 42. The majority of these children (43/55) had the expected pattern of an increasing IgG avidity index (AI) after each dose of vaccine (not detected (ND), 0.30, and 2.97 at days 0, 21, and 42, respectively). The avidity responses in the remaining children (12/55) were quite different, with AIs increasing abruptly after the first dose and then declining after the second dose of vaccine (ND, 8.83, and 7.15, respectively). These children also had higher concentrations of influenza virus-specific IgG1 and IgG3 antibodies at day 21. Although the antibody titers were similar, some antigen-naive children demonstrated an unusual pattern of avidity maturation after two immunizations with AS03-adjuvanted, low-dose influenza virus vaccine. These data suggest the presence of subtle differences in the quality of the antibodies produced by some subjects in response to this vaccine. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Clinical and Vaccine Immunology American Society For Microbiology

Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted Pandemic H1N1 (2009) Influenza Virus Vaccine

Clinical and Vaccine Immunology , Volume 20 (4): 459 – Apr 1, 2013

Abstract

Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted Pandemic H1N1 (2009) Influenza Virus Vaccine Karen K. Yam a , Jyotsana Gupta a , Angela Brewer a , David W. Scheifele b , Scott Halperin c , Brian J. Ward a , d , Public Health Agency of Canada/Canadian Institute of Health Research, Influenza Research Network (PCIRN) Rapid Trial Study 3 (RT-03) Investigators Department of Experimental Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada a Vaccine Evaluation Centre, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada b Canadian Centre for Vaccinology, IWK Grace Hospital, Dalhousie University, Halifax, Nova Scotia, Canada c Vaccine Study Centre, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada d ABSTRACT During the 2009-2010 H1N1 influenza pandemic, an adjuvanted monovalent vaccine containing ∼25% of the normal antigen dose and AS03 adjuvant was widely used in Canada. This vaccine was found to be well-tolerated and immunogenic in young children (D. W. Scheifele et al., Pediatr. Infect. Dis. J. 30:402–407, 2011). We report here additional analyses to further characterize the humoral response to this vaccine. We measured standard hemagglutination inhibition (HAI) and microneutralization (MN) titers, as well as influenza virus-specific IgG avidity and subclass distribution by enzyme-linked immunosorbent assay in 73 subjects. Sera were collected before (day 0) and 3 weeks after each dose of vaccine (days 21 and 42). Most children (55/73) had undetectable HAI and MN titers at day 0 (presumed to be antigen naive) and mounted good responses at days 21 and 42. The majority of these children (43/55) had the expected pattern of an increasing IgG avidity index (AI) after each dose of vaccine (not detected (ND), 0.30, and 2.97 at days 0, 21, and 42, respectively). The avidity responses in the remaining children (12/55) were quite different, with AIs increasing abruptly after the first dose and then declining after the second dose of vaccine (ND, 8.83, and 7.15, respectively). These children also had higher concentrations of influenza virus-specific IgG1 and IgG3 antibodies at day 21. Although the antibody titers were similar, some antigen-naive children demonstrated an unusual pattern of avidity maturation after two immunizations with AS03-adjuvanted, low-dose influenza virus vaccine. These data suggest the presence of subtle differences in the quality of the antibodies produced by some subjects in response to this vaccine.

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References (39)

Publisher
American Society For Microbiology
Copyright
Copyright © 2013 by the American society for Microbiology.
ISSN
1556-6811
eISSN
1556-679X
DOI
10.1128/CVI.00619-12
pmid
23345582
Publisher site
See Article on Publisher Site

Abstract

Unusual Patterns of IgG Avidity in Some Young Children following Two Doses of the Adjuvanted Pandemic H1N1 (2009) Influenza Virus Vaccine Karen K. Yam a , Jyotsana Gupta a , Angela Brewer a , David W. Scheifele b , Scott Halperin c , Brian J. Ward a , d , Public Health Agency of Canada/Canadian Institute of Health Research, Influenza Research Network (PCIRN) Rapid Trial Study 3 (RT-03) Investigators Department of Experimental Medicine, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada a Vaccine Evaluation Centre, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada b Canadian Centre for Vaccinology, IWK Grace Hospital, Dalhousie University, Halifax, Nova Scotia, Canada c Vaccine Study Centre, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada d ABSTRACT During the 2009-2010 H1N1 influenza pandemic, an adjuvanted monovalent vaccine containing ∼25% of the normal antigen dose and AS03 adjuvant was widely used in Canada. This vaccine was found to be well-tolerated and immunogenic in young children (D. W. Scheifele et al., Pediatr. Infect. Dis. J. 30:402–407, 2011). We report here additional analyses to further characterize the humoral response to this vaccine. We measured standard hemagglutination inhibition (HAI) and microneutralization (MN) titers, as well as influenza virus-specific IgG avidity and subclass distribution by enzyme-linked immunosorbent assay in 73 subjects. Sera were collected before (day 0) and 3 weeks after each dose of vaccine (days 21 and 42). Most children (55/73) had undetectable HAI and MN titers at day 0 (presumed to be antigen naive) and mounted good responses at days 21 and 42. The majority of these children (43/55) had the expected pattern of an increasing IgG avidity index (AI) after each dose of vaccine (not detected (ND), 0.30, and 2.97 at days 0, 21, and 42, respectively). The avidity responses in the remaining children (12/55) were quite different, with AIs increasing abruptly after the first dose and then declining after the second dose of vaccine (ND, 8.83, and 7.15, respectively). These children also had higher concentrations of influenza virus-specific IgG1 and IgG3 antibodies at day 21. Although the antibody titers were similar, some antigen-naive children demonstrated an unusual pattern of avidity maturation after two immunizations with AS03-adjuvanted, low-dose influenza virus vaccine. These data suggest the presence of subtle differences in the quality of the antibodies produced by some subjects in response to this vaccine.

Journal

Clinical and Vaccine ImmunologyAmerican Society For Microbiology

Published: Apr 1, 2013

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