Safety and Long-term Humoral Immune Response in Adults After Vaccination With an H INI 2009 Pandemic Influenza Vaccine With or Without AS03 Adjuvant

Background. In this study (NCT00985088) we evaluated different formulations of an H1N1 2009 pandemic influenza vaccine that deliver various viral hemagglutinin (HA) doses with or without AS03 (a tocopherol-based oil-in-water adjuvant system). Methods. A total of 1340 healthy subjects aged ≥18 years...

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Bibliographic Details
Published in:The Journal of infectious diseases 2012-03, Vol.205 (5), p.733-744
Main Authors: Ferguson, Murdo, Risi, George, Davis, Matthew, Sheldon, Eric, Baron, Mira, Li, Ping, Madariaga, Miguel, Fries, Louis, Godeaux, Olivier, Vaughn, David
Format: Article
Language:English
Subjects:
Age
Antigens
Blood
Dosage
H1N1 subtype influenza A virus
Immune response
Influenza vaccines
Older adults
Pandemics
Vaccination
VIRUSES
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Summary:Background. In this study (NCT00985088) we evaluated different formulations of an H1N1 2009 pandemic influenza vaccine that deliver various viral hemagglutinin (HA) doses with or without AS03 (a tocopherol-based oil-in-water adjuvant system). Methods. A total of 1340 healthy subjects aged ≥18 years were randomized to receive 1 or 2 doses of an adjuvanted (3.75-μg HA/AS03 A or 1.9 μg HA/AS03 B ) or nonadjuvanted vaccine formulation. Safety and immunogenicity (by hemagglutination-inhibition [HI] assay) after each dose and 6 months after dose 1 are reported here. Results. A single dose of AS03 A -adjuvanted 3.75- μg HA H1N1 2009 induced the strongest immune responses in subjects aged 18-64 years (seroprotection rate [SPR], 97.2%; seroconversion rate [SCR], 90.1%) as well as in subjects aged >64 years (SPR, 91.1%; SCR, 78.2%) 21 days after vaccination. Six months after dose 1, subjects who received 2 doses of either the adjuvanted formulation or 1 dose of the adjuvanted 3.75^ g HA formulation continued to meet all Center for Biologies Evaluation and Research and Committee for Medicinal Products for Human Use criteria. All formulations had clinically acceptable safety profiles. Conclusion. A single dose of the 3.75-μg HA AS03 A -adjuvanted H1N1 2009 influenza vaccine was highly immunogenic in both age strata (18— 64 and >64 years), inducing long-term persistence of the immune response until at least 6 months after dose 1.
ISSN:0022-1899