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Managemental influences on the selective proliferation of two strains of haemolytic Escherichia coli in weaned pigs

Published online by Cambridge University Press:  19 October 2009

D. J. Hampson ,
Z. F. Fu ,
K. A. Bettleheim  and
M. W. Wilson
D. J. Hampson
Affiliation:
Department of Veterinary Pathology and Public Health, Massey University, Palmerston North, New Zealand
Z. F. Fu
Affiliation:
Department of Veterinary Pathology and Public Health, Massey University, Palmerston North, New Zealand
K. A. Bettleheim
Affiliation:
National Health Institute, kenepuru Drive, Porirua, New Zealand
M. W. Wilson
Affiliation:
National Health Institute, kenepuru Drive, Porirua, New Zealand
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In an experimental study on a piggery it was found that haemolytic Escherichia coli of O-scrotypes 138 or 139 proliferated in the intestinal tracts of pigs following weaning, with E. coli of the 0-138 typo also being occasionally recovered from unwearied pigs, and onco from a sow. Organisms of the O-138 typo produced heat labile enterotoxin and their presence in weaned pigs was associated with the development of severe post-weaning diarrhoea. E. coli of O-130 type produced a vero cell cytotoxin and were associated with a milder diarrhoea in weaned pigs. Under various managemental circumstances the O-138 type E. coli almost invariably proliferated after weaning. The O-139 strain of E. coli did however proliferate rather than the O-138 strain following the movement of weaned pigs to new accommodation, after weaned pigs were returned to their sow and then weaning again 5 days later, and very occasionally in pigs weaned at 5 weeks of ago. In all theso cases earlier proliferation of the O-138 E. coli had been detected, suggesting that this may be a prerequisite for proliferation of the O-130 strain.

Type
Research Article
Information
Epidemiology & Infection , Volume 100 , Issue 2 , April 1988 , pp. 213 - 220
Copyright
Copyright © Cambridge University Press 1988

References

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