Ecological studies of Yersinia enterocolitica. III. Cross-protection against fecal excretion between Y. enterocolitica serovars 3 and 5.27 in pigs.

Yersinia enterocolitica biovar 4 serovar 3 and biovar 2 serovar 5.27 failed to establish in the intestines of pigs when challenged with the homologous or heterologous strains. After inoculation, the serum O-agglutinin titers were 1/10 or less and were not boosted by challenge with either serovar. Y. enterocolitica were not recovered in any specimens at the time of slaughter.