CD40LG and COVID-19: Between 15 and 21 days after symptom onset, the diagnostic sensitivity of the four POC antibody rapid tests detecting COVID-19 infection increased to 95.7% (95% CI, 78.1–99.9%) (AllTest 2019-nCoV IgG/IgM Rapid Test), 87.0% (95% CI, 66.4–97.2%) (Dynamiker 2019-nCoV IgG/IgM Rapid Test & ASK COVID-19 IgG/IgM Rapid Test), and 91.3% (95% CI, 72.0–98.9%) (Wondfo SARS-CoV-2 Antibody Test), and reached to 100% (95% CI, 88.4–100%) after 3 weeks of symptom onset for all the four POC antibody rapid tests.