Figure 4

Comparison of the specificity against “RT-PCR-negative group” with that against “Before COVID-19 group”. We compared the specificity against “RT-PCR-negative group” (n = 79) with that against “Before COVID-19 group” (n = 100), which contains healthy subjects in 2017. (A) SARS-CoV-2 IgM, (B) SARS-CoV-2 IgG.