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