CD8A and COVID-19: We also estimated the ratios CD4+/CD8+ T cells, Th1/Th2, Th1/Th17, Th9/Th17, and Th17/Treg polarized T cells, as well as the ratios of mature/memory-like NK cells, classical/non-classical monocytes, granulocytes/lymphocytes, granulocytes/CD3+ T cells, and CD11b+/CD11b− granulocytes, as some of these ratios were reported to predict the outcome of COVID-19 patients [19,20].