CD40LG and COVID-19: Sera were collected approximately 3 weeks following exposure for the detection of antibodies againstSARS-CoV-2. EDI Novel Coronavirus COVID-19 lgG and IgM ELISA (Epitope Diagnostics, Inc., SanDiego, CA, USA) were used for initial testing, and supplemented with tests from DiaSorin (LIAISONSARS-CoV-2 S1/S2 IgG test), Abbott (Alinity i SARS-CoV-2 IgG), Roche (Elecsys Anti-SARS-CoV-2) andWantai (WANTAI SARS-CoV-2 Ab ELISA).