PTPRC and infection: The IAV single infection does not cause significant cell number variation in the peripheral blood, while the SARS-CoV-2 single-infection group showed significantly lower CD45+ cells (at 5 and 7 dpi) (Fig. 3F, right), monocytes (at 2 dpi) (Fig. 3G, right), and B cells (at 7 dpi) (Fig. 3H, right) than the PBS-treated control group.