Managemental influences on the selective proliferation of two strains of haemolytic Escherichia coli in weaned pigs
Hampson, D.J., Fu, Z.F., Bettleheim, K.A. and Wilson, M.W. (1988) Managemental influences on the selective proliferation of two strains of haemolytic Escherichia coli in weaned pigs. Epidemiology and Infection, 100 (02). p. 213.
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In an experimental study on a piggery it was found that haemolytic Escherichia coli of O-serotypes 138 or 139 proliferated in the intestinal tracts of pigs following weaning, with E. coli of the O-138 type also being occasionally recovered from unweaned pigs, and once from a sow. Organisms of the O-138 type produced heat labile enterotoxin and their presence in weaned pigs was associated with the development of severe post-weaning diarrhoea. E. coli of O-139 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 age. In all these cases earlier proliferation of the O-138 E. coli had been detected, suggesting that this may be a prerequisite for proliferation of the O-139 strain.
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|Publisher:||Cambridge University Press|
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