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adult worm amoebae animals asexual bancrofti becomes infected blood cells blood film body breadth capsule cavity cercariae containing corpuscles coverslip cuticle cycle Cyclophyllidea Cysticercus cysts Diagnosis dogs duct eggs encysted Entamoeba examination faeces falciparum female flagella flagellum fluid fresh fresh films gametocyte genital pore genus Geographical distribution give rise glands gravid Habitat haemocoele histolytica host human faeces hydatid Infective larvae ingested intestine large numbers larvae larval stage Leishmania length lesions liver malaria male mature measures membrane merozoites metacercariae microfilariae microscope migrate miracidium Morphological characters mosquito mucosa multiply muscles nucleus occur ocular oesophagus organs oval ovary ovum parasites Pathogenicity penetrate peripheral blood plerocercoid posterior present produced protozoa rats red blood red cell rediae Schistosoma schizogony schizont scolex segment skin slide snail solium species spirochaetes sporocyst superfamily swallowed Taenia tail tissue trematodes trophozoites tropical trypanosomes tube unencysted usually uterus ventral sucker vitelline vivax