Moreover, the expression level of genes encoding for IFN-γ, IL-2, IL-4, IL-6, IL-17, TGF-B, IL-8, and IL-1β was significantly higher in hospitalized COVID-19 patients compared to healthy controls; however, there was no significant difference in the expression level between intensive care unit (ICU)-admitted and non-ICU admitted patients in reported data [30]. This evidence concerns the gene IL2 and COVID-19.