The production of bacteriocin-like substances by strains of Yersinia frederiksenii, Y. kristensenii and Y. intermedia in broth culture was established. These substances showed a selective activity against Y. enterocolitica, Y. frederiksenii, Y. kristensenii and Y. intermedia strains. Electron micrographs revealed the presence of phage tails in culture media. The production of these substances was detected in cultures grown at 25 degrees C but not in those grown at 37 degrees C, while these bacteriocin-like substances were active at 25 and 37 degrees C. Y. enterocolitica serogroups 0:3 and 0:9 were more susceptible to these bacterin-like substances than strains of Yersinia isolated from environmental sources.

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