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Apoptosis of alveolar macrophages after infection with attenuated or virulent Mycobacterium bovis. C57BL/6 mice were intratracheally infected with attenuated or virulent M. bovis. After 3 and 7 days of infection, alveolar macrophages were stained with annexin V and 7-aminoactinomycin D for analysis of apoptosis by flow cytometry. Each bar represents mean ± SE. Results from one representative experiment of three with similar results is shown. *P < 0.05 versus control, #P < 0.05.
