Clinical studies have shown elevated inflammatory cytokines, including tumor necrosis factor-alpha (TNF- α), interleukins (IL; IL2, IL6, IL7, IL8, IL9, and IL10), chemokines (CXCL10, CCL2, IP10, MCP1), and colony-stimulating factors (G-CSF, GM-CSF) in COVID-19 patients compared to a healthy person. Here, CCL2 is linked to COVID-19.