title: A retrospective diagnostic laboratory survey of antimicrobial resistance in fecal Escherichia coli isolated from spring calves in western Canada.
abstract: Diagnostic laboratory data on antimicrobial susceptibility of Escherichia coli isolated from feces of spring calves were evaluated retrospectively for the 5-year period from 1999 to 2003. The antimicrobials to which resistance was most prevalent were tetracycline, ampicillin, and trimethoprim/sulphamethoxazole. Resistance to 3 or more antimicrobials was found in 52.5% [95% confidence interval (CI): 47.9 to 56.6] of the E. coli isolates. Incomplete records reduced the usefulness of the diagnostic laboratory data for surveillance. Standardized patient information submitted by veterinary clinics would increase the value of this data for surveillance.
authors.affiliation: University of Calgary, Faculty of Veterinary Medicine, NW, Calgary, Alberta T2N 4N1, USA. slcheckl@ucalgary.ca
authors.forename: Sylvia L
authors.initials: SL
authors.lastname: Checkley
authors.forename: John R
authors.initials: JR
authors.lastname: Campbell
authors.forename: Cheryl L
authors.initials: CL
authors.lastname: Waldner
authors.forename: Patricia M
authors.initials: PM
authors.lastname: Dowling
authors.forename: Manuel
authors.initials: M
authors.lastname: Chirino-Trejo
mesh_terms: D000818:Animals; D002170:Canada; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy*; D015169:Colony Count, Microbial / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D024881:Drug Resistance, Bacterial; D024901:Drug Resistance, Multiple, Bacterial; D004359:Drug Therapy, Combination; D004926:Escherichia coli / Q000187:drug effects*; D004927:Escherichia coli Infections / Q000188:drug therapy / Q000662:veterinary*; D005243:Feces / Q000382:microbiology; D005260:Female; D008297:Male; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D012189:Retrospective Studies; D016896:Treatment Outcome