COVID-19 severity is often related to the exacerbation of the inflammatory process; in fact, high concentrations of cytokines [interleukin (IL)-2, IL-7, IL-10, GCSF, IP10, MCP1, MIP1A, TNFα] were observed in plasma of 13 patients admitted to the intensive care unit (ICU) of Wuhan in China. Here, IL10 is linked to COVID-19.