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. Here, TNF is linked to infection.