IL6 and COVID-19: The results of the present study showed that in the plasma of COVID-19 patients, the expression of pro-inflammatory cytokines—TNFα (Figure 6, Supplementary Table S1) and IL-6 (Table 1) and the anti-inflammatory interleukin—IL-10 (Figure 6, Supplementary Table S1) increases, especially in the plasma of recovered COVID-19 patients.