We determined the plasma levels of various growth factors (vascular endothelial growth factor [VEGF], EGF, fibroblast growth factor‐2 [FGF‐2], platelet‐ derived growth factors‐AA [PDGF‐AA], platelet‐derived growth factor‐BB [PDGF‐BB], transforming growth factor [TGF]α, Flt‐3L, GZB, PDL‐1, TRAIL, and CD40L) in children and elderly COVID‐19 individuals. The gene discussed is FLT3LG; the disease is COVID-19.