[The role of various intermediate and definitive host species in the dissemination of Opisthorchis felineus from the Ob-Irtysh focus of opisthorchiasis].

Opisthorchiasis irradiation from the Ob-Irtysh focus is possible at the social level only: migration of invaded humans, fish export. Invasion irradiation from the endemic area through intermediate hosts is practically impossible, while through the definite hosts, wild fish-eating mammals, it is limited.