IL6 and COVID-19: However, in severe COVID-19 patients, Huang et al. reported that the cytokines were higher than in SARS and MERS patients (Conti et al., 2020; Huang et al., 2020); in particular, IL-6 levels were the highest in severely ill patients affected by COVID-19 (Chen G. et al., 2020; Ruan et al., 2020; Wu et al., 2020; Zhang W. et al., 2020; Zhou F. et al., 2020).