Additionally, in non-severe COVID-19—although significantly lower than severe ones—blood-cytokine levels (for example IL-1β, IL-1RA, IL-2R, IL-6, IL-7, IL-8, IL-9, IL-10, IFN-γ, TNF-α, G-CSF, GM-CSF, IP10, MCP1), can be increased [48,58,59]. Here, TNF is linked to COVID-19.