CD40LG and COVID-19: A recent study showed that in COVID-19 patients, IgM and IgA antibodies to SARS-CoV-2 had been detected with a median of 5 (25th–75th percentiles: 3–6) days, while IgG was detected 14 (25th–75th percentiles: 10–18) days after symptom onset, with positive rates of 85.4%, 92.7%, and 77.9%, respectively [19].