CXCR6 and COVID-19: In order to analyze changes in NK cells and T cells in the lung upon respiratory viral infection, we analyzed gene expression of chemokines that are ligands to CXCR3, CXCR6, CCR2, and CCR5 (Figure 4A) or total chemokines (Figure S4A) in total BAL cells as well as chemokine receptors in NK cells and CD8+ T cells (Figure 4B and Figure S4B) using a publicly available scRNAseq dataset from BAL fluid cells from COVID-19 patients with moderate or severe disease (7).