IL6 and COVID-19: To date, several studies have reported increased levels of cytokines concurrent with SARS-CoV-2 infection; for example, levels of pro-inflammatory cytokines TNF-α, IFN-γ, and IL-6 and levels of anti-inflammatory cytokines IL-2, IL-4, and IL-10 were reported to be higher in COVID-19 patients than healthy individuals [46].