Risk factors for infection with verocytotoxigenic Escherichia coli in cattle on Ontario dairy farms

Risk factors for prevalent infection with verocytotoxigenic Escherichia coli (VTEC) were studied in a random sample of 886 cows and 592 calves under 3 months of age on 80 randomly selected dairy farms in southern Ontario. Fecal-culture supernatants from each animal were screened for verocytotoxicity...

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Bibliographic Details
Published in:Preventive veterinary medicine 1998-02, Vol.34 (2), p.227-236
Main Authors: Wilson, J.B., Renwick, S.A., Clarke, R.C., Rahn, K., Alves, D., Johnson, R.P., Ellis, A.G., McEwen, S.A., Karmali, M.A., Lior, H., Spika, J.
Format: Article
Language:English
Subjects:
Age Factors
Animal Husbandry - standards
Animals
Bacterial Toxins - biosynthesis
Bacterial Toxins - toxicity
BOVIN LAITIER
Cattle
Cattle Diseases - epidemiology
Cell Survival - drug effects
Cercopithecus aethiops
DAIRY CATTLE
Dairy farms
Data Interpretation, Statistical
Databases as Topic
Enterotoxins - biosynthesis
Enterotoxins - toxicity
ESCHERICHIA COLI
Escherichia coli - isolation & purification
Escherichia coli Infections - diagnosis
Escherichia coli Infections - epidemiology
Escherichia coli Infections - veterinary
Feces - microbiology
Female
GANADO DE LECHE
INFECCION
INFECTION
MORBIDITE
MORBIDITY
MORBOSIDAD
Multivariate Analysis
ONTARIO
Ontario - epidemiology
Polymerase Chain Reaction
RIESGO
RISK
Risk factors
RISQUE
Shiga Toxin 1
Software
TOXICIDAD
TOXICITE
TOXICITY
Vero Cells - drug effects
Verocytotoxigenic E. coli
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Summary:Risk factors for prevalent infection with verocytotoxigenic Escherichia coli (VTEC) were studied in a random sample of 886 cows and 592 calves under 3 months of age on 80 randomly selected dairy farms in southern Ontario. Fecal-culture supernatants from each animal were screened for verocytotoxicity using a Vero cell assay (VCA) and for verocytotoxin (VT) genes by a polymerase chain reaction (PCR) procedure. Up to 20 E. coli isolates from positive samples were tested for VT production using VCA and PCR. VTEC isolates were serotyped. Farm managers were interviewed using a standardized questionnaire to obtain information on farm- and individual animal-level management practices and characteristics. There was a significant ( P
ISSN:0167-5877
1873-1716
DOI:10.1016/S0167-5877(97)00010-X