CD4 and COVID-19: Furthermore, we also did not see any difference between severe COVID-19 and moderate COVID-19 patients in the proportion of SARS-Co-V2-specific IFNγ-producing CD4+ or CD8+ T cells expanded in vitro (p = 0.71 for CD4+, Supplementary Fig. 2e, p = 0.48 for CD8+, Supplementary Fig. 2f).