FIGURE 6.

SARS-CoV-2 IgM (hatched red plots) and IgG (filled blue plots) titers tested by an ELISA, according to the days from symptom onset. IgM and IgG levels increased significantly over time. Antibody levels are presented as the measured S/CO. The dotted line represents the cutoff value (1.1). The boxplots show medians (middle line) and first and third quartiles (boxes), whereas the whiskers indicate minimum and maximum values. ELISA, enzyme-linked immunosorbent assay; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; S/CO, absorbance values divided by the cutoff [Colour figure can be viewed at wileyonlinelibrary.com]