Flow cytometry was used to detect apoptosis, and the results revealed that the apoptotic cell percentage (right upper quadrant and right lower quadrant represent the late-stage apoptosis rate and early stage apoptosis rate, respectively) after CHOP knockdown dramatically reduced in the P150-infected cells at 12 h after infection (p < 0.001), but did not affect P1-induced cell death (Figures 6D,E). Here, DDIT3 is linked to infection.