Article
Molecular Epidemiology of Ceftiofur-Resistant <i>Escherichia coli</i> Isolates from Dairy Calves
1 Jun 2006
Abstract excerpt
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...
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