CCL2 and infection: In addition, some studies found that the levels of IL‐2, IL‐4, IL‐6, IL‐7, IL‐10, IP‐10, MCP‐1, TNF‐α, MIP‐1α, IFN‐γ, and G‐CSF in patients with severe COVID‐19 infection were significantly higher than those in patients with mild and moderate infection.13, 53, 54