In one study of COVID-19 patients, a notable increase in multiple serum cytokines (e.g., TNF-α, IFN-γ, IL-2, IL-4, IL-6 and IL-10) was seen [59], while another study showed high plasma levels of IL-1β, IL-1RA, IL-7, IL-8, IL-9, IL-10, bFGF, GCSF, GM-CSF, IFN-γ, IP-10, MCP1, MIP-1α, MIP-1β, PDGF, TNF-α, and VEGF. Here, CXCL8 is linked to COVID-19.