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Rate of positive SARS-CoV-2 IgM (dotted red curve with triangles), IgG (dotted blue curve with rhombus), and IgM or IgG (solid purple curve) tested by an ELISA according to the days from symptom onset. A total of 116 samples from 35 patients were tested. From day 15 (D15) onwards, all samples were positive for IgM or IgG. ELISA, enzyme-linked immunosorbent assay; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2 [Colour figure can be viewed at wileyonlinelibrary.com]
