Stratified cluster random sampling method was used to select 5 towns and 5 villages in Doumen District to investigate the situation and risk factors of Clonorchis hepatica infection; questionnaire survey was carried out for residents over 8 years old to collect the information of knowledge, credit and behavior of Clonorchis hepatica; and the infection of Clonorchis hepatica was examined by modified Kato's smear method<br>
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