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Epidemiol Infect. 1999 Oct;123(2):291-8.

Prevalence of Escherichia coli O157:H7 in range beef calves at weaning.

Author information

1
Animal Health Research Unit, US Meat Animal Research Center, USDA, ARS, Clay Center, Nebraska 68933, USA.

Abstract

This study was designed to determine the prevalence of Escherichia coli O157:H7 infection of beef calves at weaning, prior to arrival at the feedlot or mixing with cattle from other sources. Fifteen range cow-calf herds, which weaned calves in October and November, were sampled in Kansas, Missouri, Montana, Nebraska and South Dakota. Faecal culture for E. coli O157:H7 was performed and anti-O157 serum antibody titres were determined by blocking ELISA. Thirteen of the 15 herds (87%) were found to have at least one positive isolation of E. coli O157:H7 in faecal samples. Within positive herds, prevalence ranged from 1.7-20.0%, with an average of 7.4+/-6.2% S.D. of individual animals shedding E. coli O157:H7 in faeces. All herds had high prevalence of anti-O157 antibodies, ranging 63-100% of individuals within herds seropositive. This study indicates that E. coli O157:H7 infection before weaning, prior to entry into feedlots, is widespread. Furthermore, serologic evidence suggests that most calves (83%) and all herds (100%) have been exposed to E. coli O157.

PMID:
10579450
PMCID:
PMC2810762
DOI:
10.1017/s0950268899002757
[Indexed for MEDLINE]
Free PMC Article

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