CD40LG and COVID-19: The results showed that the positive rate of detection with the rapid antibody test kit with N protein was 92.59 % (25/27) for patients with COVID-19 and was 0.00 % (0/27) for health professionals; the positive rate of the IgM assay with S1 protein was 40.74 % (11/27) for patients with COVID-19 and 6.89 % (4/58) for health professionals (Table 1).