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Distribution of Antibiotic Resistance Genes among the Phylogroups of Escherichia coli in Diarrheic Calves and Chickens Affected by Colibacillosis in Tehran, Iran

AUTHORS

H. Staji 1 , * , A. Tonelli 2 , T. Zahraei Salehi 3 , A. Mahdavi 1 , E. Shahroozian 1 , M. R. Salimi Bejestani 1 , S. Mehdizade Mood 1 , M. Keywanloo 1 , M. Ahmadi Hamedani 1 , H. Emadi Chashmi 1 , I. Ashrafi Tamai 3 , E. Atefi Tabar 1

AUTHORS INFORMATION

1 Department of Pathobiology, Faculty of Veterinary Medicine, Semnan University, Semnan, Iran

2 Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise Giuseppe Caporale, Department of Research and Development, Campo Boario, 64100 Teramo TE, Italy

3 Department of Microbiology, Faculty of Veterinary Medicine, Tehran University, Tehran, Iran

ARTICLE INFORMATION

Archives of Razi Institute: 73 (2); 131-137
Published Online: March 01, 2017
Article Type: Journal Article
Received: October 23, 2016
Accepted: April 23, 2017
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Abstract

Antibiotic resistance occurs in the endogenous flora of exposed population in addition to pathogenic bacteria. This study was conducted to evaluate the distribution of antibiotic resistance genes among 63 isolates of Escherichia coli of Escherichia coli (E. coli) in diarrheic calves and poultry. According to the results, B1 and B2 were the most prevalent phylogroups of E. coli in calves and poultry carcasses, respectively. Antimicrobial resistance was observed in 76% of the isolates, and 62% of the strains were multi-drug resistant. Antibiotic resistance in E. coli strains obtained from calves strains was significantly higher than those obtained from poultries. Additionally, the strains of B1 and D phylogroups had the highest and lowest antimicrobial resistance, respectively. At least one encoding gene for integrone was detected in 23 strains (36.5%) and Class I integron had the highest prevalence. Accordingly, this study gave baseline information on the magnitude of the resistance problem and its genetic background in E. coli from domesticated animals of the Tehran, Iran. Moreover, the power of oligonucleotide array technology in the discrimination of different genotypes during a short time was confirmed in this study.

Keywords

Escherichia coli Phylogroups Integrons Resistance genes

© 2018, Archives of Razi Institute. Razi Vaccine and Serum Research Institute.
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