:: Volume 19, Issue 1 ( Winter 2017, 19 (1) 2017) ::
Koomesh 2017, 19(1): 207-212 Back to browse issues page
Investigation of phylogenetic diversity among Eschereshia coli isolates recovered from hospitalized patients
Omid Pajand, Khatereh Ghassemi, Fatemeh Kamali, Sahar Taghavipoor, Zoya Hojabri
Abstract:   (1874 Views)

Introduction: Eschereshia coli (E.coli) as one of the major cause of infections in hospital settings can be classified into phylogenetic groups which are different in virulence, growth rates and antibiotic susceptibility patterns. In this study, we aimed to perform phylogenetic analysis in E.coli strains to understand association between phylogroups and antibiotic susceptibility patterns.

Materials and Methods: Two hundred and sixty E. coli isolates recovered from hospitalized patients at Kosar teaching hospital in Semnan city, Iran were subjected to phylogenetic typing by a quadruplex PCR method. Antimicrobial susceptibility testing was also performed by disk agar diffusion method.

Results: Phylogroup B2 was the most predominant phylogroup (38.4%) followed by A (14.8%), F (13.4%), D (9.3%), B1 (8.8%), C and E (4.6%), unknown (4.2%), and clade I (1.9%). We found 70.4% of our isolates were multiple drug resistant (MDR). The most and the least efficient antibiotics were meropenem and trimethoprime/sulfamethoxazole with 94.4% and 27.8% of susceptibility rates, respectively.

Conclusion: Our results represent the high prevalence of MDR E. coli isolates with dominance of phylogroup B2. Phylogroup B2 not only could be considered as a virulent phylogroup but also as a genetic antibiotic resistance reservoir.

Keywords: Eschereshia coli, Bacterial Drug Resistance, Phylogeny
Full-Text [PDF 732 kb]   (463 Downloads)    
Type of Study: Research | Subject: General
Received: 2016/03/12 | Accepted: 2016/10/5 | Published: 2017/01/3

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Volume 19, Issue 1 ( Winter 2017, 19 (1) 2017) Back to browse issues page