Antibody levels will be evaluated by hemagglutination inhibition (HI) assay from sera obtained pre-vaccination (Day 0) and 21 days post-vaccination, for antigens from the 2004-2005 influenza virus strains: A/New Caledonia/20/99 (H1N1), A/Wyoming/03/2003 (H3N2), and B/Jiangsu/10/2003.