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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 ( bla TEM-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.

journal of veterinary research

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

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