The authors assess opisthorchiasis situation at settlements near compressor stations along 2000 km gas line crossing Western Siberia from North to South. The mean opisthorchiasis incidence was found to be 17.4 +/- 0.7% (from 1.6% in the Extreme North to 38% in hyperendemic regions). Judging from children invasion rate (4.4%), the risk of opisthorchiasis invasion is high in this territory. Opisthorchiasis incidence in the newcomers who lived for more than a decade in this region was up to 38.4% (52.6 in hyperendemic zone). Consumption of improperly prepared salted fish was the most important risk factor. Serologic diagnosis making use of modified enzyme immunoassay test systems is advisable for epidemiologic survey and detection of population invasion rate.
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