Synchronization ofE. coliO157 shedding in a grass-fed beef herd: a longitudinal study

Author:

LAMMERS G. A. C.,McCONNEL C. S.,JORDAN D.,AYTON M. S.,MORRIS S.,PATTERSON E. I.,WARD M. P.,HELLER J.

Abstract

SUMMARYThis study aims to describe in detail the temporal dynamics ofE. coliO157 shedding and risk factors for shedding in a grass-fed beef herd. During a 9-month period, 23 beef cows were sampled twice a week (58 sampling points) andE. coliO157 was enumerated from faecal samples. Isolates were screened by PCR for presence ofrfbE,stx1andstx2. The prevalence per sampling day ranged from 0% to 57%. This study demonstrates that many members of the herd were concurrently sheddingE. coliO157. Occurrence of rainfall (P< 0·01), feeding silage (P< 0·01) and lactating (P< 0·01) were found to be predictors of shedding. Moving cattle to a new paddock had a negative effect on shedding. This approach, based on short-interval sampling, confirms the known variability of shedding within a herd and highlights that high shedding events are rare.

Publisher

Cambridge University Press (CUP)

Subject

Infectious Diseases,Epidemiology

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