When comparing DEG in both SARS-CoV-2-infected groups at day 2 (i.e., 2 days after SARS-CoV-2-only infection and 4 days after H1N1 infection in the dual-infected group), only five known genes (Cd3d, Ctsw, Kirrel2, Osbpl1a and Aurkb) were differentially expressed at padj < 0.05 (Supplementary Data S3). This evidence concerns the gene KIRREL2 and infection.