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The activities of three antibiotics in both Mueller-Hinton broth (MHB) and pooled human urine were compared by using an in vitro pharmacodynamic model. Clinical and reference strains of Escherichia coli were exposed to antibiotics at concentrations achievable in human urine. The rate of bacterial killing (time to a reduction of 3 log10 CFU/ml) and the extent of bacterial killing at 24 h were examined. Between MHB and urine, there were no significant differences in the rate or extent of bacterial killing for both ampicillin and ciprofloxacin. For trimethoprim-sulfamethoxazole there was no significant difference in the extent of bacterial killing in urine compared with that in MHB (P &gt; 0.1); however, there was a significant decrease in the rate of bacterial killing in urine compared with that in MHB (P &lt; 0.001). We conclude that with ampicillin and ciprofloxacin, activity against E. coli in MHB is predictive of the effects in human urine. The activity of trimethoprim-sulfamethoxazole in MHB predicts the extent but not the rate of bacterial killing in human urine.

Antibiotic activity in microbiological media versus that in human urine: comparison of ampicillin, ciprofloxacin, and trimethoprim-sulfamethoxazole