title: AF03-adjuvanted and non-adjuvanted pandemic influenza A (H1N1) 2009 vaccines induce strong antibody responses in seasonal influenza vaccine-primed and unprimed mice.
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.
authors.affiliation: Research Department, Sanofi Pasteur, Marcy L'Etoile, France. catherine.caillet@sanofipasteur.com
authors.forename: Catherine
authors.initials: C
authors.lastname: Caillet
authors.forename: Fabienne
authors.initials: F
authors.lastname: Piras
authors.forename: Marie-Clotilde
authors.initials: MC
authors.lastname: Bernard
authors.forename: Aymeric
authors.initials: A
authors.lastname: de Montfort
authors.forename: Florence
authors.initials: F
authors.lastname: Boudet
authors.forename: Frederick R
authors.initials: FR
authors.lastname: Vogel
authors.forename: Agnès
authors.initials: A
authors.lastname: Hoffenbach
authors.forename: Catherine
authors.initials: C
authors.lastname: Moste
authors.forename: Inca
authors.initials: I
authors.lastname: Kusters
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage*; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood*; D005260:Female; D006385:Hemagglutination Inhibition Tests; D007117:Immunization, Secondary / Q000379:methods; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D014611:Vaccination / Q000379:methods*
chemical_list: D000276:Adjuvants, Immunologic; D000914:Antibodies, Viral; D007252:Influenza Vaccines