Routine laboratory blood tests, including Eosinophils (EO) (20, 21), C-reactive protein (CRP) (22–24), interleukin 6 (IL-6) (25, 26), Prothrombin time (PT) (27), and lactate dehydrogenase (LDH) (21, 28), have been implicated in the pathogenesis of COVID-19 and are used as indicators of disease severity. Here, IL6 is linked to COVID-19.