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(A) Fecal E. coli concentration over time after treatment with either a single dose (12.5 mg/kg once) or multiple dose (5 mg/kg once a day for 3 days) of enrofloxacin. Mean ± SD. * indicates a significant difference from time 0, p < 0.05. (B) Comparison of culturable E. coli concentration and the frequency of the E. coli 16S sequence variant.
