Molecular epidemiology of ceftiofur-resistant Escherichia coli isolates from dairy calves.

@article{Donaldson2006MolecularEO,
  title={Molecular epidemiology of ceftiofur-resistant Escherichia coli isolates from dairy calves.},
  author={Sarah C Donaldson and Beth A Straley and Narasimha V Hegde and Ashish A. Sawant and Chitrita DebRoy and Bhushan M. Jayarao},
  journal={Applied and environmental microbiology},
  year={2006},
  volume={72 6},
  pages={3940-8}
}
Healthy calves (n = 96, 1 to 9 weeks old) from a dairy herd in central Pennsylvania were examined each month over a five-month period for fecal shedding of ceftiofur-resistant gram-negative bacteria. Ceftiofur-resistant Escherichia coli isolates (n = 122) were characterized by antimicrobial resistance (disk diffusion and MIC), serotype, pulsed-field gel electrophoresis subtypes, beta-lactamase genes, and virulence genes. Antibiotic disk diffusion assays showed that the isolates were resistant… CONTINUE READING

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