Occurrence of Yersinia enterocolitica in the throat of swine.

Yersinia enterocolitica serotype 0 3 was isolated from 84 (30%) of 282 throat swab cultures from bacon pigs at slaughter. Other serotypes of Y.e. were not isolated. All the isolations were made by the cold-enrichment method. The serum agglutinin titres against serotype 0 3 were low in most of the pigs examined. The rate of isolation of the organism increased with rising serum titre. In Denmark, Y.e. serotype 0 3 would appear to be a common inhabitant of the throat of swine.