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Infection of MDBK cells with cpBVDV causes apoptosis. (A) Immunoblot analysis during a time course of BVDV infection. Virus-induced PARP cleavage initiates at ∼20 h postinfection (h.p.i.). (B) Single-stranded DNA ELISA of MDBK cells mock infected or infected with BVDV. Infections were performed in triplicate. The apoptotic index represents the change in ELISA signal relative to mock-infected samples.
