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abdomen adult worm Africa alcohol Ancylostoma animals antigen arthropods Ascaris bite blood body cavity cells cent cercariae chitinous clinical Clonorchis Clonorchis sinensis containing cutaneous cycle cysts definitive host diagnosis differentiated digestive tract Dipylidium caninum disease dogs dorsal duct eggs elongate encysted endemic eosinophilia esophagus excretory experimental Fasciola hepatica feces female fever fish flagellates flies free-living genital genus glands granules hairs helminthic histolytica hookworm immunity infection ingested intermediate hosts intestinal larvae Leishmania length lesions liver malaria male mammals mansoni mature membrane method microfilariae miracidium mosquitoes mucosa nematodes nucleus oral organs oval ovary ovum pair parasite patients Plasmodium posterior end produce proglottides proglottis Protozoa rats reaction redia redrawn Schistosoma scolex Section VII segments sinensis skin snail sodium species sporocyst stage stain surface symptoms thorax ticks tion tissues toxic transmission treatment trematodes trophozoite trypanosomes usually uterus vectors vein ventral sucker vivax