Novartis: US interim data show lower doses of antigen may suffice to generate a protective immune response against A(H1N1)
The data also showed a single 3.75µg dose of MF59-adjuvanted A(H1N1) 2009 vaccine met serologic protection criteria against influenza A(H1N1) in children ages 3 to 8, adults ages 18 to 64, and the elderly. All A(H1N1) 2009 influenza study vaccines were manufactured using the Novartis established seasonal Fluvirin® manufacturing platform. Novartis has discussed these new data with the US Food and Drug Administration (FDA) and is performing additional statistical analysis suggested by the agency. It is still under evaluation whether the antigen content per dose can be reduced in the US.
Current US guidelines for A(H1N1) 2009 vaccine use state that adolescents, adults and the elderly are required to receive one 15µg dose to achieve adequate protective antibody levels against the A(H1N1) virus, and children 9 years of age and under are required to receive two 15µg doses four weeks apart.
These interim data were generated from pivotal clinical studies designed to evaluate the immunogenicity, safety and reactogenicity of both MF59-adjuvanted and unadjuvanted, inactivated novel swine origin A(H1N1) 2009 monovalent subunit influenza virus vaccine in 4,080 US subjects. In the pediatric trial, the findings are based on 80% of first dose data from 1,360 subjects ages 3 to 8 at day 22. In the adult trial, the findings are based on 95% of first dose data at day 1 and day 8 and approximately 40% of first dose data at day 22 from 1,360 adult subjects and 1,360 elderly subjects. Second dose data and data in ages 6-36 months of age are expected in December 2009.
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