Changes in antimicrobial susceptibility in a population of Escherichia coli isolated from feedlot cattle administered ceftiofur crystalline-free acid.

@article{Lowrance2007ChangesIA,
  title={Changes in antimicrobial susceptibility in a population of Escherichia coli isolated from feedlot cattle administered ceftiofur crystalline-free acid.},
  author={T Courtney Lowrance and Guy H. Loneragan and David J Kunze and Tammy M Platt and Samuel E. Ives and Harvey Morgan Scott and Bo Norby and Alejandro Echeverry and Mindy M. Brashears},
  journal={American journal of veterinary research},
  year={2007},
  volume={68 5},
  pages={501-7}
}
OBJECTIVE To determine effects of administration of ceftiofur crystalline-free acid (CCFA) on antimicrobial susceptibility of Escherichia coli in feedlot cattle. ANIMALS 61 feedlot steers. PROCEDURES A cohort study was conducted. Steers were housed in pens (5 pens with 10 steers and 1 pen with 11 steers). Five steers in each pen were administered CCFA, and 5 served as control steers (1 pen had 6 control steers). The CCFA administration included a single-dose regimen (6.6 mg/kg, SC, on day 0… CONTINUE READING

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