CD40LG and COVID-19: Regarding RDTs specificities, except for the PanbioTM COVID-19 IgG/IgM (Abbott) (Sp: 93.33%), the evaluated tests, showed good specificity in the detection of SARS-CoV-2 antibodies (specificity ≥ 95% compared to WANTAI SARS-CoV-2 Ab ELISA).