First, cytokines (e.g., IL1B, IL1RA, IL7, IL8, IL9, IL10, FGF, GCSF, GMCSF, IFNG, IP10, MCP1, MIP1A, MIP1B, PDGF, TNF, and VEGF) in plasma were significantly increased in patients with COVID-19 compared with the healthy control group. The gene discussed is CCL2; the disease is COVID-19.