[Characteristics of the adaptation of the dwarf tapeworm to new hosts].

Studies of the inbred lines of mice A/He, AKR and CBA infected with different strains of H. nana have shown that the helminth, when changing the host for another one of the same species but with different hereditary characters, happens to be insufficiently adapted to the new host. However it does not prevent the start of the infectious process. With increasing number of passages the parasite's adaptation level to the organism of the new host rises gradually. Possibilities and the adaptation level of the agent to the new host are defined as well by the adaptational mechanisms common to each specific strain of H. nana and the host's characters.