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Survival of mid-log-phase anaerobic cells of B. fragilis strains shifted to aerobic conditions. Cultures of mid-log-phase cells at an optical density at 550 nm of 0.3 were divided at time zero; one half was shaken at 250 rpm in air at 37°C, and the other half was maintained anaerobically. Viable cell counts were determined at the times shown. For clarity, data for the anaerobic control cultures are not shown.
