CXCL8 and COVID-19: Similarly, the concentrations of IL-6, IL-8 and TNFα correlated with the surface expression of CD11b and CD66b in the pooled analysis (Supplementary Figures 5A–F), whereas only IL-8 and TNFα (but not IL-6) correlated with the percentage of CD49d+ neutrophils when the COVID-19 and Control groups were combined for analysis (Supplementary Figures 6A–C).