CXCL10 and COVID-19: Severe or fatal COVID-19 is indeed associated with elevated innate pro-inflammatory immune cytokines in peripheral blood including interleukin (IL)-1, IL-6, IL-8, or C–X–C motif chemokine ligand 10 (CXCL-10) (7, 10) and alterations of both innate and adaptive immunity (11–13).