CXCL8 and COVID-19: Incubation of platelets from COVID-19 patients with monocytes from healthy donors triggers the release of IL-1β, IL-6, IL-8, MIP-1α, MCP-1, TNF-α, PF4, and PDGF [12,39], and elevated levels of these factors were observed in clinical samples from COVID-19 patients [45].