Objective To examine the prevalence of intestinal helminthes and the effects mass anthelmintic administration among rural residents in Shandong province and to provide evidences for implementing control measures for the diseases. Methods Totally 34 384 permanent rural residents aged ≥ 3 years were recruited with cluster sampling from34 municipalities,districts or counties for a survey on intestinal helminthes infection with modified Kato-Katz method and cellophane anal swab. Mass administration of albendazo...