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Background Vancomycin resistant enterococcus (VRE) is the third major cause of nosocomial infections in hospitals after staphylococcus and E. coli. The aim of this study was to evaluate resistance pattern of VRE to the antibiotics recommended by CLSI. Materials and Methods: In this clinical trial, 833 enterococci, obtained from urine, wound, blood, and stool, were selectively collected from hospitals in Tehran. After verification of the VRE isolates through the use of 30µg vancomycin disc and agar dilution, VREs were isolated, and their inhibiting concentrations were determined. The sensitivity of these enterococci to antibiotics was assessed at CLSI’s M100 standard. Results: Of the 833 isolated enterococci, 4% had a high level of resistance to vancomycin, and 38.5% had a low level of resistance to vancomycin. Of the VREs, 8.5%, 85%, 50%, 42%, 94%, 30%, 70%, 24%, 6%, and 97% were resistant to vancomycin, ampicilin, erythromycin, tetracycline, rifampin, chloramphenicol, gentamicin, synercid, linozolid and penicillin, respectively. All these VRE isolates were sensitive to nitrofurantoin. Conclusion: In this study, all VRE isolates were sensitive to nitroforantoin, and this antibiotic, as a drug of choice for urinary tract infections, can also be recommended in the treatment of resistant enterococci.

Keywords: Clinical sample, nitrofurantoin, VRE

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