Figure 5.

Schematic representation of the prolonged detection of SARS-CoV-2 IgM antibodies. (A) cases of continuous prolonged detection of IgM antibodies; (B) cases with alternating positive/negative/indeterminate (gray zone) results. Pink rectangles represent months with a positive result in test #4, green rectangles represent months with a negative result in test #4, gray rectangles represent an indefinite (gray zone) result in test #4. Red asterisks indicate positive results confirmed in the second IgM test #7, light green asterisks indicate negative results in test #7. The day of the last testing is indicated at the end of the columns.