If about 70% RT-PCR positivity (sensitivity) is taken as reference in acute infection in some cases; IgM, IgG, or total SARS CoV-2 antibody response between 77.9% and 93.0% in COVID-19-positive cases in our study can be accepted as evidence of high rates of seropositivity from the tests [13,36]. Here, CD40LG is linked to COVID-19.