As IgM and IgA decrease after approximately 30 to 90 days [20], ELISAs focusing on IgM/IgA might be of special importance to diagnose SARS-CoV-2 infections in the future, when in a population the background seroprevalence of IgG is higher, and IgM and/or IgA may distinguish between acute or past infection. This evidence concerns the gene CD40LG and infection.