In another study analyzing VD in COVID-19, the patients were divided according to the severity of SARS-CoV-2 infection: (i) mild disease (n = 24, mean age 41, outpatients); (ii) moderate disease, patients with COVID-19 pneumonia with interleukin-6 levels below 40 pg/mL (n = 24, mean age 42, 72 days after leaving hospital); and (iii) severe disease, patients with COVID-19 pneumonia with interleukin-6 levels above 40 pg/mL (n = 21, mean age 44, 70 days after leaving hospital). Here, IL6 is linked to COVID-19.