The reagents were provided in-kind: SARS-CoV-2 IgG by Abbott, Elecsys Anti-SARS-CoV-2 by Roche, ADVIA Centaur SARS-CoV-2 Total by Siemens, STANDARD F COVID-19 IgM/IgG Combo FIA and STANDARD Q COVID-19 IgM/IgG Combo by SD Biosensor, and P4DETECT COVID-19 IgG/IgM by PRIME4DIA. This evidence concerns the gene CD40LG and COVID-19.