CCL2 and COVID-19: The main inflammatory cytokines and chemokines widely produced by patients with severe forms of COVID-19 are IL-6, IL-8, IL-1β, TNF-alpha, IFN-gamma, MIP1α and 1β, CCL2, CCL5, CCL20, CXCL1, CXCL2, CXCL8, CXCL10, and CXCL17.