The plasma levels of an array of cytokines (Type 1—interferon [IFN]γ, interleukin [IL]‐2, and tumor necrosis factor [TNF]α, Type 2—IL‐4, IL‐5, IL‐13, IFNs—IFNα and IFNβ), regulatory cytokines—IL‐10, IL‐25, and IL‐33 and other pro‐inflammatory cytokines—IL‐1α, IL‐1β, IL‐6, IL‐12, IL‐15, IL‐17A, IL‐3, IL‐7, granulocyte ‐colony stimulating factor, granulocyte macrophage‐colony stimulating factor, IL‐1Ra) were analyzed in COVID‐19 children and elderly patients. The gene discussed is IL15; the disease is COVID-19.