Immune response after one or two doses of pandemic influenza A (H1N1) monovalent,AS03-adjuvanted vaccine in HIV infected adults |
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Authors: | Allan Bybeck Nielsen Henriette Schjønning Nielsen Lars Nielsen Søren Thybo Gitte Kronborg |
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Institution: | 1. Department for Infectious Diseases, Hvidovre Hospital, University Hospital of Copenhagen, Copenhagen, Denmark;2. Department of Virology, Statens Serum Institute, National Institute for Health Data and Disease Control, Copenhagen, Denmark;3. Department for Infectious Diseases, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark |
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Abstract: | IntroductionContinued research is needed to evaluate and improve the immunogenicity of influenza vaccines in HIV infected patients. We aimed to determine the antibody responses after one or two doses of the AS03-adjuvanted pandemic influenza A (H1N1) vaccine in HIV infected patients.MethodFollowing the influenza season 2009/2010, 219 HIV infected patients were included and divided into three groups depending on whether they received none (n = 60), one (n = 31) or two (n = 128) doses of pandemic influenza A (H1N1) vaccine. At inclusion, antibody titers for all patients were analyzed and compared to pre-pandemic antibody titers analyzed from serum samples in a local storage facility.Results4–9 months after a single immunization, we found a seroprotection rate of 77.4% and seroconversion rate of 67.7%. After two immunizations the rates increased significantly to seroprotection rate of 97.7% and seroconversion rate of 86.7%.ConclusionA single dose of AS03-adjuvanted pandemic influenza A (H1N1) vaccine created an adequate immune response in HIV infected patients lasting as long as 4–9 months. Two doses improved the immunogenicity further. |
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Keywords: | Pandemic influenza A (H1N1) Vaccination HIV infection Immune response |
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