We sorted CD24 + cells from the lungs of animals: prior to infection (0 DPI), during active infection (2 DPI), and matched populations at 14 days post-infection that had either experienced direct viral infection (14 DPI tdTomato + ) or those that had never been infected (14 DPI tdTomato−) (Fig. 4a). This evidence concerns the gene CD24 and viral infectious disease.