| [rivers of the orenburg region: maintenance of the life cycle of opisthorchis felineus]. | specific hydrological and climatic features contribute to the functioning of the parasitic system egg--mollusk--fish--man parasitic in the orenburg region. four types of areas, such as floodplain, suprafloodplain-terrace, valley-ravine, and near-lake ones, are adequate for the formation of a natural opisthorchiasis focus. the periods of active functioning of a natural opisthorchiasis focus have been established in the orenburg region. these include the emergence of the first cercariae and, there ... | 2007 | 17912826 |