Kinetics of cytopathogenicity of VSV-ΔM51-GFP in PDA cells. Cells were seeded in 96-well plates so that they reached 50% confluence at 24 h. The cells were then mock infected or virus infected at low (0.001 CIU/cell), intermediate (0.1 CIU/cell), or high (1 CIU/cell) MOI. MTT cell viability assays were performed at 1, 16, 24, 48, and 72 h p.i. Cell viability is expressed as the percentage of mock-infected cells at 1 h p.i. All MTT assays were done in triplicate, and the data represent means and standard deviations.