[The spread and evaluation of the potential for the formation of new foci of opisthorchiasis and diphyllobothriasis in the Yenisei basin].

Current epidemiological situation on opisthorchiasis and bothriocephaliasis and possibility of its alteration due to hydro construction is characterized. Construction of the Bratsk and Krasnoyarsk reservoirs led to development of new large foci of bothriocephaliasis. There is a possibility of developing new foci near other operating reservoirs or near those under construction and design. Foci of bothriocephaliasis on the Yenisei reservoirs are supposed to be more intensive than foci on the Angara reservoirs. Some opisthorchiasis foci are found in the Biryusa basin, local cases of human invasion are registered in regions on the Taseyeva river, down the Angara, and in one of the Yenisei regions where invasion foci of low intensity are supposed to exist. Reservoir construction on the Yenisei and Angara will not promote the development of new opisthorchiasis foci.