IL6 and COVID-19: Along the same lines, Qin et al. (5) reported significantly different IL-6 levels between severe and non-severe COVID-19 cases (25.2 pg/mL vs. 13.3 pg/mL, p < 0.001) as well as significantly different IL-10 levels between these cases (6.6 pg/mL vs. 5.0 pg/mL; p < 0.001).