A multidrug efflux phenotype mutant of Streptococcus pyogenes.

Abstract excerpt

We describe a mutant of Streptococcus pyogenes NCTC 8198 with a multidrug efflux phenotype. A mutant selected with ethidium bromide showed a four-fold rise in MIC of norfloxacin, a 16-fold rise in MIC of ethidium bromide and an eight-fold rise in MIC of acriflavine when compared with the parent strain. The MICs were unaffected by the efflux pump inhibitors reserpine, rescinnamine and verapamil. The mutant's...

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