Submitted: 11 May 2015
Accepted: 30 Jun 2015
ePublished: 23 Aug 2015
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Avicenna J Clin Microbiol Infect. 2015;2(3): 29691.
doi: 10.17795/ajcmi-29691
  Abstract View: 1084
  PDF Download: 534

Research Article

Emergence of blaCTX-M-15 Gene and Its Transferability in Enterobacter spp. Isolated From the Hospitals of Tehran, Iran

Kobra Salimian Rizi 1*, Shahin Najar Peerayeh 1, Bita Bakhshi 1, Mohammad Rahbar 2

1 Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IR Iran
2 Department of Microbiology, Iranian Reference Health Laboratory, Deputy of Health, Ministry of Health and Medical Education, Tehran, IR Iran
*Corresponding Author: Corresponding author: Kobra Salimian Rizi, Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IR Iran. Tel: +98-9382657837, Fax: +98-1288006544, Email: alimian.k@gmail.com


Background: Enterobacter spp. is increasingly recognized as an important nosocomial pathogen and implicated in many episodes of hospital acquired infections.

Objectives: The current study aimed to describe distribution and transferability of blaCTX-M-15 gene, and the antibiotic susceptibility pattern in the clinical isolates of Enterobacter spp.

Materials and Methods: A total of 110 Enterobacter isolates were collected from five hospitals in Tehran, Iran from May 2012 to April 2013. Enterobacter species were identified by API 20E system. Antibacterial susceptibility was determined by disk diffusion method, and extended spectrum beta lactamase (ESBL) production was confirmed by combined disk method. The blaCTX-M-15 gene was identified by PCR with specific primers. The transferability of the blaCTX-M-15was tested by conjugation with broth matting method.

Results: The prevalence of Enterobacter species was E. cloacae (78.2 %), E. aerogenes (6.13 %) and E. sakazakii (8.2%). They were from different clinical sources. Maximal resistance in Enterobacter isolates was noticed against Augmentin®, trimethoprim - sulfamethoxazole and cefoxitin 75.5%, 64.5%, and 59.1%, respectively. Fourteen isolates, showed ESBL phenotype. The blaCTX-M-15 gene frequency in Enterobacter isolates was 11.8%. Three conjugative plasmids containing blaCTX-M-15 were found in one Enterobacter isolate.

Conclusions: It was the first report on the blaCTX-M-15 gene emergence in clinical Enterobacter spp. in Iran. The current study demonstrated the predominant presence of the gene encoding CTX-M-15 among ESBL producing Enterobacter spp. commonly with a large plasmid, in the setting.

Copyright © 2015, Hamadan University of Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.
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