Studies on Yersinia enterocolitica isolated from swine and dogs.

Yersinia enterocolitica serotype 03 was isolated from the colon contents of 27 (4.5%) of 599 bacon pigs on slaughter. Two (1.7%) out of 115 dogs were positive by culture for this human-athogenic serotype of Y. enterocolitica. A number of other serotypes of Y. enterocolitica were also obtained both from porcine and canine enteric contents (4b, 5a, 6, 7, 11, 12, 15, 17, 19, 26b, and non-typeable strains). All these serotypes are supposedly non-pathogenic for man and may possibly originate from the microflora of the environment. Haemolysis on bovine blood agar was observed for strains belonging to O-serotype 3.