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Effect of antibiotic treatment on the concentrations of facultative Gram-negative bacilli in stool by culture. Mice received oral vancomycin for 10 days, vancomycin taper and pulsed regimen for 42 days, fidaxomicin for 10 days, or sterile water (control). Results for five mice from each treatment group are shown at each time point. Error bars show the standard errors. *, P < 0.05.
