Virulence and antimicrobial resistance of Enterococcus faecium isolated from water samples.

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Virulence and antimicrobial resistance of Enterococcus faecium isolated from water samples.

Lett Appl Microbiol. 2015 Aug 6;

Authors: Enayati M, Sadeghi J, Nahaei MR, Aghazadeh M, Pourshafie MR, Talebi M

Abstract
The aim of this study was to determine the incidence of Enterococcus species and six virulence factors of Enterococcus faecium which were isolated from surface water and wells. Fifteen different water samples, which were used for drinking as well as agricultural irrigation, were collected from nine private wells and surface water from six rivers located at the east of Tehran. The E. faecium isolates were tested for their resistance to 10 antibiotics and their virulence factors were detected using multiplex PCR for esp, acm, gelE, asa1, cylA, and hyl genes. The most predominant species in 315 isolates were E. faecium (n=118) followed by E. galinarom (n=110), E. mundeti (n=18), E. hirea (n=37) and E. casselifelavus (n=32). The resistance rates were observed in 41.5%, 27.1%, 12.7%, 6.8%, and 1.7% isolates for tetracycline, erythromycin, ampicillin, ciprofloxacin and chloramphenicol respectively. None of the E. faecium isolates were resistant to vancomycin, teicoplanin, linezolid, gentamicin, and quinuspristin-dalfopristin. Virulence determinant was found in 84.7%, 33.9%, 16.1% and 2.5% of isolates for acm, asa1, esp, cylA, respectively. None of the isolates carried hyl and gelE gene. The presence of virulence factors and antibiotic resistance indicated that water might be an important source of dissemination of virulent enterococci. This article is protected by copyright. All rights reserved.

PMID: 26249819 [PubMed - as supplied by publisher]