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Hemagglutination inhibition (HAI) serum antibody titer induced by H1N1 viral infection. Ferrets were infected intranasally (106 PFU) with A/Singapore/6/1986 H1N1 influenza virus. At days 14 (A) and 81 (B), ferret sera were collected. HAI titers of pooled sera were tested against a panel of 9 H1N1 influenza viruses. Values are log2 HAI titers, and dotted lines indicate the 1:40 to 1:80 HAI titer range.
