2011Dalian Yike Daxue xuebaoRequires access

Study of the effect of fluroquinolone combination on the mutant selection window(MSW) of Staphylococcus aureus

Chunfang Liu

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Abstract

[Objective] To study the effect of fluroquinolone combination on the mutant selection window(MSW) of staphylococcus aureus in vitro.[Methods] MIC for 38 clinical isolates of staphylococcus aureus and quality control(ATCC25923) were determined by the standard two fold agar dilution methods.MPC of fluoroquinolones against strains were determined by agar dilution methods.The values of MPC50,MPC90 and MPC/MIC were calculated.SPSS statistics software was used to analyze the data.[Results] After combined with cephazoline,MPC90/MIC90 of levofloxacin was down from 16 to 8,that of moxifloxacin was also down from 4 to 1.[Conclusions] Combined with cephazoline,fluoroquinolone could narrow or even close the MSW which fluoroquinolone only produces,reduce the selective enrichment of resistant mutants,and prevent development of drug resistant.

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What this paper is about

[Objective] To study the effect of fluroquinolone combination on the mutant selection window(MSW) of staphylococcus aureus in vitro.[Methods] MIC for 38 clinical isolates of staphylococcus aureus and quality control(ATCC25923) were determined by the standard two fold agar dilution methods.MPC of fluoroquinolones against strains were determined by agar dilution methods.The values of MPC50,MPC90 and MPC/MIC were calculated.SPSS statistics software was used to analyze the data.[Results] After combined with cephazoline,MPC90/MIC90 of levofloxacin was down from 16 to 8,that of moxifloxacin was also down from 4 to 1.[Conclusions] Combined with cephazoline,fluoroquinolone could narrow or even close the MSW which fluoroquinolone only produces,reduce the selective enrichment of resistant mutants,and prevent development of drug resistant.

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Available abstract

[Objective] To study the effect of fluroquinolone combination on the mutant selection window(MSW) of staphylococcus aureus in vitro.[Methods] MIC for 38 clinical isolates of staphylococcus aureus and quality control(ATCC25923) were determined by the standard two fold agar dilution methods.MPC of fluoroquinolones against strains were determined by agar dilution methods.The values of MPC50,MPC90 and MPC/MIC were calculated.SPSS statistics software was used to analyze the data.[Results] After combined with cephazoline,MPC90/MIC90 of levofloxacin was down from 16 to 8,that of moxifloxacin was also down from 4 to 1.[Conclusions] Combined with cephazoline,fluoroquinolone could narrow or even close the MSW which fluoroquinolone only produces,reduce the selective enrichment of resistant mutants,and prevent development of drug resistant.

Key concepts: Staphylococcus aureus, Agar Dilution Method, Microbiology, Moxifloxacin, Agar dilution, Agar, Mutant, Levofloxacin

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