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HAI serum antibody titers induced by A/Singapore/6/1986 (Sing/86) infection of ferrets. HAI titers were determined for ferrets (n = 32) at day 14 (A) and day 84 (B) postinfection. Collected sera were tested for HAI activity against a panel of 15 H1N1 viruses isolated from 1934 to 2013. The values for each individual titer are geometric mean titers plus the standard errors of the means (SEM) (indicated by error bars). The gray bar indicates the 1:40 to 1:80 HAI titer range.
