In vitro efficacy of fosfomycin-based combinations against clinical vancomycin-resistant Enterococcus isolates

Hung Jen Tang, Chi Chung Chen, Chun Cheng Zhang, Bo An Su, Chien Ming Li, Tzu Chieh Weng, Shyh Ren Chiang, Wen-Chien Ko, Yin Ching Chuang

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Vancomycin-resistant (VR) enterococci (VRE) are increasingly important nosocomial pathogens, commonly causing catheter-related urinary tract infections or vascular catheter-related bloodstream infections. In this study, 10 Enterococcus faecium and 9 Enterococcus faecalis different pulsed-field gel electrophoresis genome-type VR clinical isolates were detected. The potential role of fosfomycin-based combination regimens for biofilm-related VRE infection is in vitro evaluated. Anti-VRE activities of fosfomycin, ampicillin, linezolid, minocycline, rifampicin, tigecycline, teicoplanin, vancomycin alone, or fosfomycin-based combinations were studied by time-kill method and a biofilm model. Of the fosfomycin-based combinations, a synergistic effect was particularly noted for teicoplanin against 89% of the VR E. faecalis isolates. In a biofilm model, only linezolid alone was able to reduce the bacterial loads, and the use of fosfomycin-based combinations, excluding rifampicin (40%), failed to enhance antibacterial activity against VR E. faecium. For E. faecalis, an inhibitory effect was evident using ampicillin alone or fosfomycin plus rifampicin (100%), tigecycline (56%), or teicoplanin (44%). However, an antagonistic effect was found for ampicillin plus fosfomycin against 2 of 3 of the VR E. faecalis isolates. The antibacterial activities of the drugs tested against VRE in vitro varied by species. Ampicillin exhibited potential activity against planktonic- and biofilm-embedded VR E. faecalis. Fosfomycin-based combinations may have enhanced antibacterial effects against VRE even in the biofilm model, and this observation warrants further clinical studies.

Original languageEnglish
Pages (from-to)254-257
Number of pages4
JournalDiagnostic Microbiology and Infectious Disease
Issue number3
Publication statusPublished - 2013 Nov 1

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)
  • Infectious Diseases

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