[Screening by questionnaire in opisthorchiasis].

On the basis of answers to questionnaires distributed among 338 opisthorchiasis patients and 123 healthy persons in the Komi-Permiak Autonomous Okrug of Perm Province the risk factors leading to contacting opisthorchiasis were studied. As a result, a more complete characterization of the focus of this infection was obtained and a table was made, permitting the screening of population with the use of questionnaires and the determination of risk groups in this disease.