In vitro activity of antimicrobial agents against oxacillin resistant staphylococci with special reference to Staphylococcus haemolyticus

Indian J Med Microbiol. 2007 Jan;25(1):50-2. doi: 10.4103/0255-0857.31062.

Abstract

One hundred and sixty seven isolates of staphylococci isolated from the inpatients of a tertiary care referral hospital in South India were speciated and activity of oxacillin, glycopeptides, linezolid and quinupristin/dalfopristin against these isolates was tested by broth microdilution method. Of the 114 coagulase negative staphylococci (CoNS), 49.1 % were S. haemolyticus, isolated predominantly from urine (64.6%), while the rest belonged to 11 other species. More than half the isolates of S. aureus (52.8%) and 68.4% of the CoNS were oxacillin resistant. All the strains were uniformly susceptible to vancomycin, linezolid and quinupristin/dalfopristin; but 25.6% isolates of S. haemolyticus showed reduced susceptibility to teicoplanin (MIC: 8-16 mg/L). Our study demonstrates the high prevalence of oxacillin resistance among hospital isolates of S. aureus and CoNS in India. Vancomycin, along with the newer agents like linezolid and quinupristin/dalfopristin remains the drug of choice for treating multi drug resistant staphylococcal infections.

MeSH terms

  • Acetamides / pharmacology
  • Anti-Bacterial Agents / pharmacology*
  • Drug Resistance, Multiple, Bacterial
  • India
  • Linezolid
  • Microbial Sensitivity Tests
  • Oxacillin / pharmacology*
  • Oxazolidinones / pharmacology
  • Staphylococcus / drug effects*
  • Staphylococcus haemolyticus / drug effects*
  • Teicoplanin / pharmacology
  • Vancomycin / pharmacology
  • Virginiamycin / analogs & derivatives
  • Virginiamycin / pharmacology

Substances

  • Acetamides
  • Anti-Bacterial Agents
  • Oxazolidinones
  • Virginiamycin
  • quinupristin
  • Teicoplanin
  • Vancomycin
  • Linezolid
  • dalfopristin
  • Oxacillin