Next, in these three groups: COVID-19(+), HC, and COVID-19(−) virus group we analyzed median proportion and GMF intensity of: CD25, CD45RO, CD38, and HLA-DR markers on CD4 and CD8 lymphocytes T. We compared the differences in expression of these antigens between these three groups (Figure 1, Table 4). The gene discussed is CD8A; the disease is COVID-19.