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Appl Environ Microbiol. 1978 August; 36(2): 314-318

Occurrence of Yersinia enterocolitica in house rats.

ABSTRACT

From July 1976 to May 1977, 270 rats (259 Rattus norvegicus and R. rattus) in Sapporo were examined for the presence of Yersinia enterocolitica in house rats. The organism was isolated in 55 rats (54 R. norvegicus and 1 R. rattus). Isolated strains were determined as O group (O)3, biovar 4; O4, biovar 1; O5A, biovar 1; and O6, biovar 1. The isolation of O3, biovar 4 strains from R. norvegicus is the first in the world, as far as we know. The organism was isolated from the duodenum in 3 rats, the jejunum in 7 rats, the ileum in 8 rats, the cecum in 34 rats, the colon in 23 rats, the rectum in 16 rats, and the mesenteric lymph nodes in 5 rats. The organism was not isolated from liver, spleen, and kidneys. Isolation of the organism from the mesenteric lymph nodes was made in 1 out of 2 O3-positive rats, 1 out of 7 O5A-positive ones, and 3 out of 29 O6-positive ones. A high agglutinin titer was recorded in the two O3-positive rats and in one O6-positive animal.

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