Data in Fig. 3a, d show that following overnight stimulation by peptide pools, 4/18 (22.22%) and 7/18 (38.89%) of the samples from the asymptomatic patients with COVID-19 developed detectable numbers of SARS-CoV-2 specific IFNγ-producing CD4+ T cells and CD8+ T cells, respectively. This evidence concerns the gene CD4 and COVID-19.