CCL2 and COVID-19: Studies have shown increased amounts of cytokines, such as IL-1β, IL-1ra, IL-6, TNF-α, IL-7, IL-8, IL-9, IL-10, FGF basic, G-CSF, GM-CSF, IFN-γ, IP-10, MCP-1, MIP-1a, MIP-1b, in the serum of COVID-19 patients, and the cytokine storm was associated with disease severity (1, 13).