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- W2115382007 abstract "ABSTRACT The goal of this study was to follow ceftiofur-treated and untreated cattle in a normally functioning dairy to examine enteric Escherichia coli for changes in antibiotic resistance profiles and genetic diversity. Prior to treatment, all of the bacteria cultured from the cows were susceptible to ceftiofur. Ceftiofur-resistant E. coli was only isolated from treated cows during and immediately following the cessation of treatment, and the 12 bla CMY-2 -positive isolates clustered into two genetic groups. E. coli bacterial counts dropped significantly in the treated animals ( P < 0.027), reflecting a disappearance of the antibiotic-susceptible strains. The resistant bacterial population, however, did not increase in quantity within the treated cows; levels stayed low and were overtaken by a returning susceptible population. There was no difference in the genetic diversities of the E. coli between the treated and untreated cows prior to ceftiofur administration or after the susceptible population of E. coli returned in the treated cows. A cluster analysis of antibiotic susceptibility profiles resulted in six clusters, two of which were multidrug resistant and were comprised solely of isolates from the treated cows immediately following treatment. The antibiotic treatment provided a window to detect the presence of ceftiofur-resistant E. coli but did not appear to cause its emergence or result in its amplification. The finding of resistant isolates following antibiotic treatment is not sufficient to estimate the strength of selection pressure nor is it sufficient to demonstrate a causal link between antibiotic use and the emergence or amplification of resistance." @default.
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- W2115382007 date "2008-11-15" @default.
- W2115382007 modified "2023-10-12" @default.
- W2115382007 title "Effects of Therapeutic Ceftiofur Administration to Dairy Cattle on <i>Escherichia coli</i> Dynamics in the Intestinal Tract" @default.
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- W2115382007 doi "https://doi.org/10.1128/aem.01241-08" @default.
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