Next, the CD4+ T cell level in peripheral blood samples (Figure 1B,E) from patients with acute COVID-19 was lower than in COVID-19 convalescents and healthy controls (527 (399; 743) cells per 1 μL vs. 866 (703; 960) cells per 1 μL and 775 (671; 1053) cells per 1 μL with p < 0.001 in both groups, respectively). This evidence concerns the gene CD4 and COVID-19.