Th1 cells observed in individuals with COVID-19 demonstrated a distinctive expression of CXCR3 and CCR6, in addition to transcripts encoding cytokines and chemokines with anti-viral properties, such as CD154, IFN-γ, IL-2 (interleukin-2), and TNF (tumor necrosis factor) [44]. This evidence concerns the gene IFNG and COVID-19.