CD40LG and infection: Prior infection by SARS-CoV2 was ascertained by measuring total antibodies (IgM+ IgG) using theSARS-CoV-2 Total (COV2T) Advia Centaur – Siemens chemiluminescent immunoassay (CLIA). Sera from149 patients with SARS-CoV-2 infection, confirmed by RT-PCR and obtained less than 14 days after theonset of symptoms, were used as positive controls.