In vitro development and stability of tolerance to cloxacillin and vancomycin inStaphylococcus aureus

  • G. P. Voorn
  • J. Thompson
  • W. H. F. Goessens
  • W. C. Schmal-Bauer
  • P. H. M. Broeders
  • M. F. Michel
Article

Abstract

The stability of tolerance ofStaphylococcus aureus during subculturing at 37°C and development of this property after repeated exposure to cloxacillin or vancomycin were investigated in vitro. Four of five tolerant strains lost this property during repeated subculturing at 37°C for 50 days. Conversely, tolerance emerged in two of four nontolerant strains after repeated cycles of exposure to 25 µg of cloxacillin/ml or 10 µg of vancomycin/ml alternating with growth in antibiotic-free medium. Previous in vivo exposure to cloxacillin did not enhance the development of tolerance in vitro. MICs of both cloxacillin and vancomycin did not change significantly during this procedure. Whether the conversion of nontolerant strains to the tolerant state can also occur during antibiotic exposure in treatment of patients remains to be determined.

Keywords

Internal Medicine Vancomycin Repeated Exposure Repeated Cycle Cloxacillin 

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1994

Authors and Affiliations

  • G. P. Voorn
    • 1
  • J. Thompson
    • 1
  • W. H. F. Goessens
    • 2
  • W. C. Schmal-Bauer
    • 1
  • P. H. M. Broeders
    • 1
  • M. F. Michel
    • 2
  1. 1.Department of Infectious DiseasesUniversity Hospital LeidenLeidenThe Netherlands
  2. 2.Department of Clinical Microbiology and Antimicrobial TherapyErasmus UniversityRotterdamThe Netherlands

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