CXCL9 and COVID-19: CXCL9, CXCL10, and CXCL11 showed the strongest correlation with CD8+ T cell marker genes, whereas STAT1, TRAIL (TNFSF10), and BAFF (TNFSF13B) also showed a strong association with CD74 and CD16A (FCGR3A), which are associated with nonclassical monocytes and have been used as markers of inflammatory monoMacs in COVID-19 (7) (Supplemental Figures 10 and 11).