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- W1996054346 abstract "The aim of the study was to compare the prevalence of extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli bovine isolates on a conventional dairy cattle farm with high consumption of parenteral and intramammary cephalosporins (farm A) and on an organic dairy farm with no cephalosporin use (farm B). ESBL-producing E. coli were isolated from rectal swabs and milk filters by selective cultivation on MacConkey agar with cefotaxime (2 mg/l). ESBL genes were identified by polymerase chain reaction (PCR) and sequencing, and the genetic diversity of the isolates was determined by XbaI pulsed field gel electrophoresis (PFGE). Conjugative transfer, incompatibility group, and restriction fragment length polymorphism (RFLP) profiles of the ESBL-carrying plasmids were studied. Higher prevalence (39%, nrectal samples in cows = 309) of CTX-M-1-producing E. coli isolates was found on farm A compared to farm B (<1%, nrectal samples in cows = 154; 0%, nrectal samples in calves = 46). Using PFGE, the isolates from farm A were divided into nine pulsotypes. In all ESBL-positive isolates, the blaCTX-M-1 gene was carried on 40 kb IncN conjugative plasmids of three related HincII restriction profiles. Horizontal gene transfer through transmission of IncN plasmids harboring blaCTX-M-1 as well as clonal dissemination of a particular clone seems to be involved in dissemination of CTX-M-1-producing E. coli isolates in cows on the farm using cephalosporins in treating bacterial infections. The study demonstrates a possible role of cephalosporin use in the widespread occurrence of CTX-M-1-producing E. coli on the conventional dairy cattle farm compared to the organic farm." @default.
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- W1996054346 date "2011-05-01" @default.
- W1996054346 modified "2023-10-01" @default.
- W1996054346 title "IncN plasmids carrying blaCTX-M-1 in Escherichia coli isolates on a dairy farm" @default.
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- W1996054346 doi "https://doi.org/10.1016/j.vetmic.2010.11.032" @default.
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