In vitro activity of daptomycin against methicillin- and multi-resistant Staphylococcus haemolyticus invasive isolates carrying different mec complexes

Diagn Microbiol Infect Dis. 2008 Jun;61(2):227-31. doi: 10.1016/j.diagmicrobio.2008.01.019. Epub 2008 Mar 7.

Abstract

Fifty methicillin and multi-resistant Staphylococcus haemolyticus (MRSH) strains, were tested against daptomycin and comparators. Daptomycin showed an overall MIC(90) value of 1 mg/L, similar to that of quinopristin/dalfopristin and lower than the values for vancomycin (2 mg/L), linezolid (2 mg/L) and teicoplanin (32 mg/L). Eighteen strains showed heteroresistant subpopulations with teicoplanin, whereas two strains were also heteroresistant to vancomycin and these sub-populations retained susceptibility to daptomycin. Our results show the good in vitro activity of daptomycin in MRSH strains possessing a multi-resistant phenotype. Clinical data on daptomycin efficacy are necessary to confirm our in vitro findings.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / pharmacology*
  • Daptomycin / pharmacology*
  • Drug Resistance, Multiple, Bacterial*
  • Humans
  • Methicillin Resistance / genetics*
  • Microbial Sensitivity Tests
  • Staphylococcal Infections / microbiology*
  • Staphylococcus haemolyticus / drug effects*
  • Staphylococcus haemolyticus / isolation & purification

Substances

  • Anti-Bacterial Agents
  • Daptomycin