Abstract

Incubation of Yersinia pseudotuberculosis cells grown on a solid medium with pseudotuberculous diagnostic bacteriophage for 20 min at 37oC led to a significant decrease in the concentration of both components of the system. This effect was absent when the bacteria were grown in a fluid medium. At the same time, this incubation regimen promoted vesicle formation and typical morphological changes in bacteria grown in both surface and suspension cultures. Co-incubation of the bacteriophage with suspension of vesicles isolated from the suspension culture of Y. pseudotuberculosis grown at 10oC (but not 37oC) led to a decrease in plaque-forming activity of the bacteriophage.

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