CD40LG and infection: At the end of the first infection, which occurred in autumn 2020, he had 16.44 AU/mL SARS-CoV-2 IgG and 59.50 AU/mL SARS-CoV-2 IgM (Abbott: AdviseDx SARS-CoV-2 IgG II assay—chemiluminescent microparticle immunoassay (CMIA)).