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An enzyme-linked immunosorbent assay (ELISA) for the detection of IgG antibodies against the pandemic H1N1 2009 influenza A virus, employing a recombinant hemagglutinin protein of the virus, was compared to the hemagglutination inhibition (HI) test using 783 serum samples. The results showed a concordance of 98.4%, suggesting the utility of the ELISA in serosurveillance. Two hundred sixty-nine (100%) serum samples with an HI titer of &gt; or =20 were ELISA reactive.

Utility of Pandemic H1N1 2009 Influenza Virus Recombinant Hemagglutinin Protein-Based Enzyme-Linked Immunosorbent Assay for Serosurveillance