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Titers of hemagglutinin (HA)‐specific IgG antibodies in mice immunized with HAB1(H1), HAB1(H3), or HAF1(B). Mice were immunized with a HA antigen three times, at days 0, 14, and 28, and serum samples were collected prior to each immunization and 2 weeks after the third dose (study day 42). Data are shown as the mean serum IgG titers ± SE.
