[The dynamics of the indices of opisthorchiasis invasion of the population of the Chulym River basin].

Based on the findings of a 20-year follow-up, the authors analyze the incidence of opisthorchiasis in one of the regions of the Krasnoyarsk Territory, the Chulym River region. They analyze the time course of the major parameters, i.e. incidence rate, absolute and relative increment of this value and the significance of a 1% increment as exemplified by this region. They emphasize that a complex of sanitary and hygienic measures should be implemented to control and prevent opisthorchiasis in this region.