IFNA1 and viral infectious disease: These results contrast sharply with what was observed in Vero cells without IFN pretreatment (Figure 6B,C), which demonstrated that WT or delNS1 virus infection induced substantial increases in apoptosis in infected cells at 36 hpi and 48 hpi (fold changes at 36 hpi and 48 hpi in Figure 6C: 5.2–6.5).