Figure 2.

Timeline of IgM, IgG and total antibody kinetics during SARS-CoV-2 infection. The level of IgM in an individual with the activated humoral immune response against SARS-CoV-2 continues to rise until it peaks at the third week following infection. By the end of the third week, IgM levels decrease with a concomitant elevation in the level of IgG from the third to the seventh week postonset symptom (POS). For the total antibody, it peaks at the middle of the second week and reaches a plateau in the middle of the third week. The blood concentration persists for several weeks and months postinfection (image made with Biorender.com).