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Antibody Persistence and Booster Responses to Split-Virion H5N1 Avian Influenza Vaccine in Young and Elderly Adults
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Antibody Persistence and Booster Responses to Split-Virion H5N1 Avian Influenza Vaccine in Young and Elderly Adults
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Journal Article
Antibody Persistence and Booster Responses to Split-Virion H5N1 Avian Influenza Vaccine in Young and Elderly Adults
2016
Overview
Avian influenza continues to circulate and remains a global health threat not least because of the associated high mortality. In this study antibody persistence, booster vaccine response and cross-clade immune response between two influenza A(H5N1) vaccines were compared. Participants aged over 18-years who had previously been immunized with a clade 1, A/Vietnam vaccine were re-immunized at 6-months with 7.5 μg of the homologous strain or at 22-months with a clade 2, alum-adjuvanted, A/Indonesia vaccine. Blood sampled at 6, 15 and 22-months after the primary course was used to assess antibody persistence. Antibody concentrations 6-months after primary immunisation with either A/Vietnam vaccine 30 μg alum-adjuvanted vaccine or 7.5 μg dose vaccine were lower than 21-days after the primary course and waned further with time. Re-immunization with the clade 2, 30 μg alum-adjuvanted vaccine confirmed cross-clade reactogenicity. Antibody cross-reactivity between A(H5N1) clades suggests that in principle a prime-boost vaccination strategy may provide both early protection at the start of a pandemic and improved antibody responses to specific vaccination once available.
ClinicalTrials.gov NCT00415129.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
Adjuvants, Immunologic - administration & dosage
/ Adult
/ Adults
/ Alum
/ Aluminum
/ Animals
/ Antibodies, Viral - immunology
/ Antibody Formation - immunology
/ Homology
/ Humans
/ Immunization, Secondary - methods
/ Influenza A Virus, H5N1 Subtype - immunology
/ Influenza in Birds - immunology
/ Influenza in Birds - virology
/ Influenza Vaccines - immunology
/ Influenza, Human - immunology
/ Male
/ Medicine
/ Medicine and Health Sciences
/ Neutralization Tests - methods
/ Vaccines
/ Vietnam
/ Virions
/ Viruses
