The association of IL-33 expression with increased production of inflammatory cytokines (IL-1β, IL-6, TNF-α, IL-12, and IL-23) in the serum of COVID-19 patients was demonstrated by Marković et al. in their work in which IL-33 was investigated as a possible predictor of the severity of the COVID-19 disease [36]. This evidence concerns the gene TNF and COVID-19.