CD8A and COVID-19: We noticed (Figure 5E–G, and Supplementary Table S3) that the most immature TEMRA CD8+ T cell subset—pE1—was significantly decreased in peripheral blood samples from acute and convalescent COVID-19 patients compared to healthy controls (5.53% (2.70; 9.38) and 5.35% (2.34; 13.77), respectively, vs. 12.60% (8.36; 21.53), p < 0.001 in both cases).