[The role of population migration in the spread of opisthorchiasis from an Ob'-Irtysh invasion focus].

The first quantitative indicators of opisthorchiasis irradiation from the invasion focus at the social level are obtained. It was demonstrated that 114.000 out of 1 mln. people leaving the helminthiasis invasion focus had suffered from opisthorchiasis. Invasion irradiation may be limited by means of reduction of emigration from the area by improvement of working and living conditions and reduction of the invasion rate, which can be attained by creation of a system of immigrants' protection and activization of preventive measures and medical treatment of local population.