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HI titers of four ferret antisera with live or formalin-treated influenza A(H1N1) viruses. Only one of the A(H1N1)v pandemic strains (A/California/04/09) showed some cross-reactivity with ferret antisera against recent seasonal A(H1N1) influenza viruses. Formalin-treated A/Netherlands/602/09 and A/Paris/2590/09 viruses had too-low hemagglutination titers to be included in the HI assay (Fig. 2C). HI titers of <20 are not shown.
