Rapid Evaluation of Pandemic H1N1 Influenza Vaccines in Young Children

The goal of this study is to determine if one or two doses of the H1N12009 influenza vaccine are needed in young children, a population group at high risk of influenza infection and subsequent hospitalization. The objectives of this study are two-fold: 1. To compare the safety and immunogenicity of 1 and 2 doses of adjuvanted H1N12009 influenza vaccine in children 6-35 months of age. 2. To conduct the trial soon after the vaccines become available and share the observations with health officials and the public as soon as possible.