Article Text

Download PDFPDF

Infection of gnotobiotic calves with Escherichia coli 0157:H7 strain A84
  1. M. J. Woodward, BSc, PhD1,
  2. D. Gavier-Widen, DVM, PhD1,
  3. I. M. McLaren, HNC1,
  4. C. Wray, BVM&S, PhD, FRCPath, MRCVS1,
  5. M. Sozmen, DVM, PhD2 and
  6. G. R. Pearson, BVMS, PhD, MRCPath, MRCVS2
  1. 1 Department of Bacteriology, Central Veterinary Laboratory, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB
  2. 2 Department of Pathology and Microbiology, University of Bristol School of Veterinary Science, Langford, Bristol BS18 7DU


Six colostrum-deprived, hysterotomy-derived calves were maintained under sterile conditions and fed a milk replacer diet. At five days of age, five of the calves were dosed orally with 109 cfu of Escherichia coli 0157: H7 strain A84. They were killed after, one, two, six, 12 and 24 days, and samples were taken for bacteriological and pathological examination. The sixth uninfected control calf was killed at seven days of age and matched samples were taken for pathological comparison. The animals remained normal throughout the observation period. Bacteriological data indicated a heavy bacterial load of strain A84 throughout the gastrointestinal tract but the bacterium was not found in liver, kidney or muscle. No evidence of ‘attaching and effacing’ lesions in the small or large intestine was found although there was a mild inflammatory response in the intestinal tract consisting mainly of infiltrating eosinophils.

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.