CD8A and COVID-19: Finally, patients with acute COVID-19 showed decreased relative numbers of CD8+ T cells (Figure 3C,F) compared to the control (22.70% (18.23; 29.65) vs. 24.96% (21.00; 29.56), p = 0.010) and altered absolute numbers of circulating CD3+CD8+ cells compared to COVID-19 convalescents and healthy controls (285 (179; 382) cells vs. 520 (355; 600) and 444 (351; 525) cells with p < 0.001 in both cases, respectively).