CXCL8 and COVID-19: To better understand the relationship between IL-26 and these other cytokines, we now performed correlation analyses and found that the concentration of IL-26 displayed a strong positive correlation (r = 0.73) with that of IL-8 (Figure 1B), and a modest positive correlation (r = 0.39) with that of TNFα (Figure 1C), in the COVID-19 group.