ClonorchiasisClonorchis sinensisHeterophyidaePraziquantelAntiplatyhelmintic AgentsParasite Egg CountParagonimusParasitesTrematode InfectionsMetacercariaeFood ParasitologyAnthelminticsKoreaAntigens, HelminthParasitic DiseasesAntibodies, HelminthBile Ducts, IntrahepaticEndemic DiseasesBile DuctsShellfishCholangiographyHost-Parasite InteractionsRiversFisheriesParasite Load