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Mutant selection window and characterization of allelic diversity for ciprofloxacin-resistant mutants of Rhodococcus equi. | LitMetric

Mutant selection window and characterization of allelic diversity for ciprofloxacin-resistant mutants of Rhodococcus equi.

Antimicrob Agents Chemother

Microbiology Division, Epizootic Research Center, Equine Research Institute, Japan Racing Association, Shimotsuke, Japan.

Published: August 2010

AI Article Synopsis

Article Abstract

The mutant prevention concentration (MPC) for ciprofloxacin was determined for two Rhodococcus equi strains. The MPC for both strains was 32 mug/ml, which is above the peak serum concentration of ciprofloxacin obtainable by oral administration in humans. Nine single nucleotide changes corresponding to eight amino acid substitutions in the quinolone resistance-determining regions of DNA gyrase subunits A and B were characterized. Only mutants with amino acid changes in Ser-83 of GyrA were highly resistant (>or=64 microg/ml). Our results suggest that ciprofloxacin monotherapy against R. equi infection may result in the emergence of ciprofloxacin-resistant mutants.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2916315PMC
http://dx.doi.org/10.1128/AAC.01670-09DOI Listing

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