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

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Association between antibody responses against H7 and seasonal subtypes in patients infected with influenza A(H7N9) virus, China. A) Levels of IgG against H1 and H3 in serum samples after symptom onset. IgG in samples taken at acute-phase (≤7 days), convalescent-phase (17–37days,) and 102–125 days after symptom onset were titrated by ELISA with recombinant H1 and H3 hemagglutinin antigens, respectively. IgG titers were transformed to log₁₀. Bars indicate SE. B and C) Correlation between IgG against H3 (B) and H1 (C) in acute-phase serum and against H7 in convalescent-phase serum. **p<0.01.