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

<sec id="j_jvetres-2020-0061_s_005">
<h3>Introduction</h3>
<p>Integrons are mobile DNA elements that allow for acquisition and dissemination of antibiotic-resistance genes among pig farm-derived bacteria. Limited information is available on integrons of <italic>Staphylococcus aureus</italic> from pig farms. The aim of this study was to characterise and investigate the prevalence of class 1 and 2 integrons in multi-drug resistant (MDR) <italic>S. aureus</italic> isolates from pig farms.</p></sec>
<sec id="j_jvetres-2020-0061_s_006">
<h3>Material and Methods</h3>
<p>A total of 724 swabs were collected from 12 pig farms in Chongqing, China, and examined by conventional microbial and molecular methods.</p></sec>
<sec id="j_jvetres-2020-0061_s_007">
<h3>Results</h3>
<p>In total, 68 isolates were <italic>S. aureus</italic>, 57 of which were methicillin resistant (MRSA). All 68 isolates were MDR strains and carried integrons, of which 88.2% (60/68) harboured both class 1 and 2. In addition, 85.3% (58/68) of the class 2 integron-positive isolates carried the β-lactam resistance gene (<italic>bla<sub>TEM-1</sub></italic>), and 66.7% (40/60) of the class 1 integron–positive isolates carried the <italic>aadA1c</italic>, <italic>aadA1</italic> or <italic>dfrA1</italic> gene for respective streptomycin and spectinomycin or trimethoprim resistance.</p></sec>
<sec id="j_jvetres-2020-0061_s_008">
<h3>Conclusions</h3>
<p>Class 1 and 2 integrons are common among the pig farm-derived <italic>S. aureus</italic> isolates. On account of their significance for public health, the prevalence of the integrons and their associated resistance genes in pig farm-derived <italic>S. aureus</italic> isolates should be paid special attention.</p></sec></abstract>

Introduction
Integrons are mobile DNA elements that allow for acquisition and dissemination of antibiotic-resistance genes among pig farm-derived bacteria. Limited information is available on integrons of Staphylococcus aureus from pig farms. The aim of this study was to characterise and investigate the prevalence of class 1 and 2 integrons in multi-drug resistant (MDR) S. aureus isolates from pig farms.

Material and Methods
A total of 724 swabs were collected from 12 pig farms in Chongqing, China, and examined by conventional microbial and molecular methods.

Results
In total, 68 isolates were S. aureus, 57 of which were methicillin resistant (MRSA). All 68 isolates were MDR strains and carried integrons, of which 88.2% (60/68) harboured both class 1 and 2. In addition, 85.3% (58/68) of the class 2 integron-positive isolates carried the β-lactam resistance gene (blaTEM-1), and 66.7% (40/60) of the class 1 integron–positive isolates carried the aadA1c, aadA1 or dfrA1 gene for respective streptomycin and spectinomycin or trimethoprim resistance.

Conclusions
Class 1 and 2 integrons are common among the pig farm-derived S. aureus isolates. On account of their significance for public health, the prevalence of the integrons and their associated resistance genes in pig farm-derived S. aureus isolates should be paid special attention.

Prevalence and characterisation of class 1 and 2 integrons in multi-drug resistant <italic>Staphylococcus aureus</italic> isolates from pig farms in Chongqing, China

Journal of Veterinary Research

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

Prevalence and characterisation of class 1 and 2 integrons in multi-drug resistant  isolates from pig farms in Chongqing, China

Introduction
Integrons are mobile DNA elements that allow for acquisition and dissemination of antibiotic-resistance genes among pig farm-derived bacteria....

Prevalence and characterisation of class 1 and 2 integrons in multi-drug resistant Staphylococcus aureus isolates from pig farms in Chongqing, China

Published Online: Sep 16, 2020

Page range: 381 - 386

Received: Mar 04, 2020

Accepted: Aug 24, 2020

DOI: https://doi.org/10.2478/jvetres-2020-0061

Keywords
pig, antibiotic resistance, integrons, resistance gene cassettes

© 2020 C. Ye et al. published by Sciendo

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

Prevalence and characterisation of class 1 and 2 integrons in multi-drug resistant Staphylococcus aureus isolates from pig farms in Chongqing, China

Published Online: Sep 16, 2020

Page range: 381 - 386

Received: Mar 04, 2020

Accepted: Aug 24, 2020

DOI: https://doi.org/10.2478/jvetres-2020-0061

Keywordspig, antibiotic resistance, integrons, resistance gene cassettes

© 2020 C. Ye et al. published by Sciendo

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

Keywords
pig, antibiotic resistance, integrons, resistance gene cassettes