However, IL-6, IL-8, IL-10 and IP-10 showed either diagnostic and prognostic classification performance, with an AUC > 0.95 in at least 2 out of the 3 groups (Control vs mild + severe COVID-19; mild vs control + severe COVID-19; severe vs control + mild COVID-19) (Supplementary Table 4). Here, IL6 is linked to COVID-19.