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HAI serum antibody titers induced by two H1N1 infections of ferrets. Ferrets were infected with Sing/86, followed by either NC/99 or Bris/07 virus. At day 98 (A and B) and day 168 (C and D), serum samples were collected, and the HAI titers were determined for each group ferrets against a panel of H1N1 influenza viruses. Values are geometric mean titers plus the SEM (error bars) from antisera. The gray bar indicates the 1:40 to 1:80 HAI titer range.
