We detected significant differences in IL-2, IL-6, IL-17A, and IFN-γ in COVID-19 (IL-2: 1.6 ± 0.46 pg/mL, IL-6: 9.7 ± 2.0, IL-17A: 84 ± 20, IFN-γ: 0.66 ± 0.20) and PCC (IL-2: 0.67 ± 0.23 pg/mL, IL-6: 3.5 ± 0.56, IL-17A: 29 ± 6.0, IFN-γ: 0.57 ± 0.16) patients when compared to the CTL group (IL-2: 0.38 ± 0.05 pg/mL, IL-6: 1.4 ± 0.25, IL-17A: 0.40 ± 0.20, IFN-γ: 0.34 ± 0.09) (Figure 5). The gene discussed is IFNG; the disease is COVID-19.