According to the study of Yong Xiong et al., relatively lower expression levels of IL-6 receptor were observed in bronchoalveolar lavage fluid (BALF) of patients with COVID-19 in comparison with healthy individual, and there are no significant differences in peripheral blood mononuclear cells (PBMC), suggests that IL-6/IL6R axis of cells in BALF and PBMC might not be involved in the COVID-19 pathophysiology [13]. Here, IL6R is linked to COVID-19.