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. 2014 Feb;20(2):192–200. doi: 10.3201/eid2002.131094

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Avidity analysis of antibodies in patients infected with influenza A(H7N9) virus, China, 2013. The avidities of IgG against influenza viruses were determined by ELISA assay with 4–7 mol/L urea. Shown are avidities of IgG against H1, H3, and H7 hemagglutinin of convalescent-phase serum samples collected 17–37 days (A) and 102–125 days (B) after symptom onset. Bars indicate SE.