Production of bacteriocin-like substances byYersinia frederiksenii, Y. kristensenii, andY. intermedia strains

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Abstract
The production of bacteriocin-like substances by strains ofYersinia frederiksenii. Y. kristensenii andY. intermedia in broth culture was established. These substances showed a selective activity againstY. enterocolitica, Y. frederiksenii, Y. kristensenii andY. 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 °C but not in those grown at 37 °C, while these bacteriocin-like substances were active at 25 and 37 °C.Y. enterocolitica serogroups 0:3 and 0:9 were more susceptible to these bacteriocin-like substances than strains ofYersinia isolated from environmental sources.