Journal
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
Volume 45, Issue 4, Pages 1305-1308Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.45.4.1305-1308.2001
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A multidrug-resistant Salmonella enterica serotype [4,5,12:i:-] clone carried a class 1 integron harboring dfrA12. and aadA2 gene cassettes and bla(TEM-1), aac(3)-IV, cmlA1, and tetA genes located in large plasmids of about 140 kb (carrying spy) or 120 kb (lacking spy). Several segregants, lacking multidrug resistance, contained a plasmid smaller than the parental one and no longer hybridized with probes for the lost resistances. The genes mediating resistance to ampicillin, chloramphenicol, and tetracycline in the [4,5,12:i:-] clone are different from those found in the pentadrug-resistant serotype Typhimurium DT104 clone.
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