Significantly up-regulated levels of cytokines and chemokines including IL1-β, IL1RA, IL10, IL9, IL8, IL7, basic FGF2, GCSF, GMCSF, IFNγ, IP10, MCP1, MIP1α, MIP1β, PDGFB, TNFα, and VEGFA in blood, have been confirmed in COVID-19 patients. Here, CCL4 is linked to COVID-19.