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Propidium iodide-stained bovine macrophages. (A) M. bovis-infected macrophages (MOI, 25:1) 12 h postinoculation, demonstrating nuclei of M. bovis-containing (bright dots) and bystander (uninfected) macrophages with chromatin condensation (arrows). (B) Noninfected macrophages with normal nuclei. (C) Chromatin condensation of macrophages treated with camptothecin (10 μg/ml) for 72 h. Magnification, ×800.
