<abstract xmlns="http://www.w3.org/1999/xhtml">

<p> The objective of the study was to examine the characteristics of the resistance profiles of Escherichia coli isolated from healthy pigs from three farms in Western Poland. The sensitivity to 13 antimicrobial agents was tested by a disk diffusion method, and the presence of 13 resistance genes was determined by PCR. The majority of the isolates were multi-resistant. The most common multi-resistance patterns were streptomycin, trimethoprim, sulfisoxazole, ampicillin, tetracycline. Although some resistance genes, such as strA/strB, bla<sub>TEM</sub>, sul1, sul2, and tetA, were equally represented in isolates from each farm, differences in the distribution of tetB and tetC, hfrV, dhfrXII, and sul1 resistance genes were observed among the isolates from different farms. Approximately one-third (35.9%) of the isolates possessed a class 1 integron. The four major different variable regions of the class 1 integron contained streptomycin (aadA1, aadA2, and aadA5) and/or trimethoprim (dhfrI, dhfrV and dhfrXVII), and/or sulphonamides (sul1) resistance genes. The results of this study emphasise that uncontrolled use of antibiotics causes the development of resistance and provides the evidence of frequent occurrence of more than one gene encoding the resistance to the same antimicrobial agent in the multi-resistant strains.</p>
</abstract>

The objective of the study was to examine the characteristics of the resistance profiles of Escherichia coli isolated from healthy pigs from three farms in Western Poland. The sensitivity to 13 antimicrobial agents was tested by a disk diffusion method, and the presence of 13 resistance genes was determined by PCR. The majority of the isolates were multi-resistant. The most common multi-resistance patterns were streptomycin, trimethoprim, sulfisoxazole, ampicillin, tetracycline. Although some resistance genes, such as strA/strB, blaTEM, sul1, sul2, and tetA, were equally represented in isolates from each farm, differences in the distribution of tetB and tetC, hfrV, dhfrXII, and sul1 resistance genes were observed among the isolates from different farms. Approximately one-third (35.9%) of the isolates possessed a class 1 integron. The four major different variable regions of the class 1 integron contained streptomycin (aadA1, aadA2, and aadA5) and/or trimethoprim (dhfrI, dhfrV and dhfrXVII), and/or sulphonamides (sul1) resistance genes. The results of this study emphasise that uncontrolled use of antibiotics causes the development of resistance and provides the evidence of frequent occurrence of more than one gene encoding the resistance to the same antimicrobial agent in the multi-resistant strains.

Phenotypic and genotypic characteristics of antibiotic resistance of commensal Escherichia coli isolates from healthy pigs

Department of Molecular Biology, Faculty of Biological Sciences

Journal of Veterinary Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The objective of the study was to examine the characteristics of the resistance profiles of Escherichia coli isolated from healthy pigs from three farms in...

Phenotypic and genotypic characteristics of antibiotic resistance of commensal Escherichia coli isolates from healthy pigs

Published Online: Jun 17, 2014

Page range: 211 - 218

Received: Nov 05, 2013

Accepted: May 20, 2014

DOI: https://doi.org/10.2478/bvip-2014-0031

Keywords
pigs, commensal E. coli, antibiotic resistance, resistance genes.

© 2014 National Veterinary Research Institute in Pulawy

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Phenotypic and genotypic characteristics of antibiotic resistance of commensal Escherichia coli isolates from healthy pigs

Published Online: Jun 17, 2014

Page range: 211 - 218

Received: Nov 05, 2013

Accepted: May 20, 2014

DOI: https://doi.org/10.2478/bvip-2014-0031

Keywordspigs, commensal E. coli, antibiotic resistance, resistance genes.

© 2014 National Veterinary Research Institute in Pulawy

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
pigs, commensal E. coli, antibiotic resistance, resistance genes.