Vaccine. 2010 Apr 19;28(18):3076-9. Epub 2010 Mar 1.

AF03-adjuvanted and non-adjuvanted pandemic influenza A (H1N1) 2009 vaccines induce strong antibody responses in seasonal influenza vaccine-primed and unprimed mice.

Caillet C, Piras F, Bernard MC, de Montfort A, Boudet F, Vogel FR, Hoffenbach A, Moste C, Kusters I.

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Research Department, Sanofi Pasteur, Marcy L'Etoile, France. catherine.caillet@sanofipasteur.com

Abstract

Pandemic influenza vaccines have been manufactured using the A/California/07/2009 (H1N1) strain as recommended by the World Health Organization. We evaluated in mice the immunogenicity of pandemic (H1N1) 2009 vaccine and the impact of prior vaccination against seasonal trivalent influenza vaccines (TIV) on antibody responses against pandemic (H1N1) 2009. In naïve mice, a single dose of unadjuvanted H1N1 vaccine (3 microg of HA) was shown to elicit hemagglutination inhibition (HI) antibody titers >40, a titer associated with protection in humans against seasonal influenza. A second vaccine dose of pandemic (H1N1) 2009 vaccine strongly increased these titers, which were consistently higher in mice previously primed with TIV than in naïve mice. At a low immunization dose (0.3 microg of HA), the AF03-adjuvanted vaccine elicited higher HI antibody titers than the corresponding unadjuvanted vaccines in both naïve and TIV-primed animals, suggesting a potential for antigen dose-sparing. These results are in accordance with the use in humans of a split-virion inactivated pandemic (H1N1) 2009 vaccine formulated with or without AF03 adjuvant to protect children and young adults against influenza A (H1N1) 2009 infection.

PMID:: 20193791; [PubMed - indexed for MEDLINE]

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