[Opisthorchiasis at left Dnieper watersheds].

Present state of opisthorchosis infestation in the Dnieper watershed (rivers Vorskla, Psyol, Khorol, Sula, Seym, Snov, Desna water basins), situated in the Sumy, Chernigov, and Poltava regions of the Ukraine, is assessed. 7909 humans from 37 villages, 94 cats, 1134 carp fishes, 20013 mollusca and 30 soil samples were screened for the presence of Opisthorchis eggs. Opisthorchosis foci with an over 36% infection rate of population remain in the watersheds of the Dnieper left confluents (rivers Desna, Seym, Vorskla and Khorol). Infestation rate varies between various rivers as well as along one and the same river which is due to several ecological and social factors. Opisthorchis circulation is established at all the rivers but in most areas it didn't involve human population. Distribution pattern of human opisthorchosis in evidently focal and patchy which should be taken into account in the planning and implementation of opisthorchosis control measures.