[Epidemiologic characteristics of diphyllobothriasis in the lower Amur River valley].

Results of epidemiological studies of diphyllobothriasis in the Lower part of the Amur watershed have demonstrated that the disease nosogeographic range covered the entire region. Potential risk of invasion of humans and animals by the tapeworms exists all over the aforementioned area. Season of invasion coincides with the period of migration of calico and humpback salmon which are additional hosts of Diphyllobothriidae. Invasion occurs outside the Amur freshwater area; thus the real disease foci are absent in the Lower part of the Amur watershed. This is due to the fact that the disease is not induced by wide fish tapeworm, but by a marine or estuarine-marine species.