The article analyzes the results of studies on the first and second intermediate hosts of the clonorchosis pathogen in mountainous and coastal provinces of Northern Vietnam. Habitats of mollusks of the family Bythiniidae of the first intermediate hosts of Clonorchosis sinensis are identified. Infestation by C.sinensis larvae was detected only in clams Parafossarulus striatulus in Thác Bá reservoir 0.1% of cases. Infestation of fish with cysts of this trematode was found in 6 of 12 studied provinces. The most favorable conditions for the formation and functioning of clonorchosis foci are created in the floodplain of the Hôngkha River and its tributaries in the central and coastal provinces of North Vietnam. Key words: molluscs, fish, cercariae, metacercariae, floodplain and river systems.

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Материалы и методы. Гельминтологический материал собирали из отловленных моллюсков и рыб. Моллюсков исследовали методами прижизненной диагностики и компрессии, рыбу -методом компрессирования спинных мышц и микроскопированием по общепринятой в гельминтологии методике. Исследовано 200 экз. моллюсков и 1030 экз. рыб 6 видов из семейства Cyprinidae в возрасте от сеголеток до двух лет. Видовой состав трематод устанавливали по определителю.

The risk of infestation of the population by the opisthorchiasis causative agent in the middle and lower reaches of the Iset River was estimated. Areas with the highest risk of peoples infection by Opisthorchis felineus’ metacercaria are identified. These territories are confined to the zones of removal of the opisthorchiasis causative agent, which are river beds and large water bodies that constantly connect with rivers. Steady risk of infection of the population is determined by the loimopotential of the opisthorchiasis natural focus. The general infestation of juveniles fishes in the middle and lower current of the Iset River made 9,9 %, annuals – 21,5 %, two-year-olds – 19,5 %.