CD40LG and COVID-19: In the current study, serological assays for COVID-19 diagnosis, including the COVID-19 IgM/IgG rapid diagnostic test (RDT), IgG nucleocapsid protein-based chemiluminescent microparticle immunoassay (CMIA), IgG and IgA spike protein-based enzyme-linked immunosorbent assays (ELISAs) were evaluated.