FIG 1.
Seropositivity and antibody levels of IgM and IgG against SARS-CoV-2 versus days after symptom onset at follow-up. (A and B) The blue and yellow part of the histogram represents the number of IgM- and IgG-positive participants, respectively, while the gray part represents the total number of individuals in each quartile of days after symptom onset (shown in the left y axis); the blue and yellow lines are connected by the same color triangles and denote the positive rate of IgM and IgG in each quartile group, respectively (shown in the right y axis). (C and D) Box plots of chemiluminescent immunoassay measurements of IgM and IgG for participants sampled in each quartile of days after symptom onset. Pc represents that the P value was produced by Wilcoxon rank sum (Mann-Whitney) test.