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An investigation of field outbreaks of transmissible gastroenteritis occurring in Ontario in 1967 and 1968 is described. Bacteria-free intestinal filtrates obtained from these outbreaks produced a clinical syndrome in pigs infected per os identical to that seen in field cases. The epizootilogical, pathomorphological and clinical signs in field cases and in experimental pigs were similar to those described in transmissible gastroenteritis in other countries.
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