IL6 and COVID-19: Many proinflammation cytokines, including IL-2, IL-6, IL-7, IL-10, granulocyte colony stimulating factor (GCSF) and TNF-α, were significantly increased in the periphery of severe COVID-19 patients (Chen N. et al., 2020; Huang et al., 2020; Liu J. et al., 2020).