[Functional phenotypic variability in a plague pathogen and plague enzootics].

In the bacterial population, phenotypic variability plays a part of structural and functional subsystem that occupies a special place in the relations of heterogenic populations by performing an important adaptive function in the common system of ecological connections of parasitocenosis. At the same time regularly varying microorganism phenotypes act as an independent system that are closely related with the conditions of the niches occupied by the causative agent. Each subsystem as part of parasitocenosis is provided by its intrinsic adaptive mechanisms, which in combination ensures the stability of biocenosis based on self-regulation of evolutionarily established ecosystems. With the total complexity of parasitocenosis, the causative agent of plague is essential in forming its focus. For objective analysis of an epizootic process, it is necessary to include the established mechanisms of phenotypic variability of the causative agent of plague as a key link of the structural and functional interaction ecosystem that determines the mechanism of plague entozootics.