title: An investigation of the presence of Escherichia coli O149:K91:F4 on pig farms in southern Ontario and the use of antimicrobials and risk factors associated with the presence of this serogroup.
abstract: Prevalence, causative factors, treatment, and preventative measures for O149:K91:F4 Escherichia coli infection of postweaning pigs was determined by using a cross-sectional study including 70 farms in Ontario. Surveys were distributed and samples cultured bacteriologically, resulting in 30% of farms testing positive to E. coli 0149:K91:F4. Possible causative factors, such as housing or nutrition, were not significantly different between positive and negative farms. Use of injectable antibiotics (P = 0.05) and zinc oxide (P = 0.003) was higher on E. coli O149:K91:K88 (F4)-positive farms. A higher level of biosecurity and the presence of other diseases may be associated with an increased risk of isolating E. coli O149:K91:F4 from weanling pigs.
authors.affiliation: Department of Population Medicine, Ontario Veterinary College, University of Guelph.
authors.forename: Rocio
authors.initials: R
authors.lastname: Amezcua
authors.forename: Robert M
authors.initials: RM
authors.lastname: Friendship
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Dewey
mesh_terms: D000822:Animal Husbandry / Q000379:methods*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D003430:Cross-Sectional Studies; D024881:Drug Resistance, Bacterial; D054307:Enterotoxigenic Escherichia coli / Q000187:drug effects / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000188:drug therapy / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary*; D005260:Female; D008297:Male; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D009864:Ontario / Q000453:epidemiology; D015995:Prevalence; D012307:Risk Factors; D012703:Serotyping / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000188:drug therapy / Q000453:epidemiology* / Q000517:prevention & control
chemical_list: D000900:Anti-Bacterial Agents