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Objectives   Enterococcus faecalis  as part of the normal floras of human gastrointestinal and genitourinary tracts are an important cause of nosocomial infections. The present study aimed to investigate the prevalence of genes encoding antimicrobial resistance and genetic relatedness of clinical isolates of  E. faecalis  among Iranian hospitalized patients.    Results  Antibiotic susceptibility testing results indicated that 53 (22.8%) out of 232  E. faecalis  isolates were vancomycin resistant (MIC ≥ 256 μg/ml). All of the 53 vancomycin-resistant  E. faecalis  isolates carried the  vanA  and  ermB  genes; whereas  aac (6′) - Ie aph (2″) ,  msrA , and  ermA  gene were found in 96.2%, 30.2% and 3.8% of vancomycin-resistant isolates, respectively. ERIC-PCR typing revealed that 53 vancomycin-resistant isolates were classified into 14 ERIC types. In our results, the high level of resistance to gentamicin, erythromycin and vancomycin in enterococci isolates were mainly related to the presence  of aac (6′) - Ie aph (2″), ermB  and  vanA  genes, respectively. Meanwhile, ERIC-PCR analysis demonstrated that most of the evaluated isolates have a close genetic relatedness.

bmc research notes

Phenotypic and genotypic characterization of glycopeptide, aminoglycoside and macrolide resistance among clinical isolates of Enterococcus faecalis: a multicenter based study