Widespread presence of dfrA12 and its association with dfrA12-aadA2 cassette in Salmonella enterica isolates from swine

• Main Authors: Pawin Padungtod, Chanwit Tribuddharat, Rungtip Chuanchuen
• Format: Journal
• Published: 2018
• Subjects: Medicine
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84857683158&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/50148
• Institution: Chiang Mai University

One hundred and eighty-nine Salmonella isolates from swine were tested for susceptibility to nine antimicrobial agents, presence of dfrAll and class 1 integrons containing dfrA12-orfF-aadA2 cassette. All isolates were multidrug resistant and exhibited highest resistance prevalence to trimethoprim (93%). Most isolates (89%) were mill-positive and 107 isolates (57%) carried dfrAll, all of which were resistant to trimethoprim. Forty-eight dfrA12-harboring strains (45%) were intl1-positive together with dfrA12-aadA2 gene cassette. Fifteen isolates contained dfrA12 but not intl1 and dfrA12-aadA2 cassette. The results indicated a wide distribution of dfrA12 and its role in dissemination of trimethoprim resistance among Salmonella isolates from fattening pigs.