Volume 3, Issue 4 (Nov 2015)                   Res Mol Med (RMM) 2015, 3(4): 28-34 | Back to browse issues page

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Ashrafian F, Fallah F, Hashemi A, Erfanimanesh S, Amraei S, Tarashi S. First Detection of 16S rRNA Methylase and blaCTX-M-15 Genes among Klebsiella pneumoniae Strains Isolated from Hospitalized Patients in Iran . Res Mol Med (RMM). 2015; 3 (4) :28-34
1- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2- Pediatric Infectious Research Center, Mofid Children Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3- 1Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran ,
Abstract:   (4074 Views)

Background: The increasing pattern of Multi-Drug Resistant (MDR) bacteria has limited therapeutic options especially for nosocomial isolates of Klebsiella pneumoniae. Therefore, the aim of this study was the molecular detection of 16S rRNA methylase and blaCTX-M-15 among K. pneumoniae strains isolated from hospitalized patients in Mofid, Imam Hossein and Taleghani hospitals.

Materials and Methods:This study was done with 110 K.pneumoniae isolated of hospitals in Tehran, Iran. Antibiotic susceptibility tests were carried out by Kirby-Bauer disc diffusion and broth microdilution methods according to CLSI guidelines. ESBL, AmpC and KPC enzymes were detected by CDDT and MHT methods and the armA, rmtB, rmtC, rmtD and blaCTX-M-15 genes were detected by PCR and sequencing techniques. Typing of antibiotic resistance isolates was carried out by PFGE technique.

Results: In this study, Fosfomycin, colistin and tigecycline were more active than other antibiotics. Among the 110 K. pneumoniae strains, 60(54.5%), 33(30%) and 5(4.5%) were ESBL, Amp-C and KPC positive, respectively. The existence of blaCTX-M-15, armA and rmtC was detected in 40(36.3%), 15 (13.6%) and 2 (1.8%) respectively. Of 15 representative armA-producing K. pneumoniae isolates analyzed by PFGE, 9 different pulsotypes (PF1–9) were identified with Dice coefficients of &ge90% similarity.

Conclusions: High-level aminoglycoside resistance in human pathogens result of 16S rRNA methylases is one of the serious concerns in Iran.

Full-Text [PDF 350 kb]   (1634 Downloads)    
Type of Study: Research | Subject: Microbiology
Received: 2015/07/2 | Accepted: 2015/11/1 | Published: 2015/11/1

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