16. Helminths 2 - Cestodes (Tapeworms) Helminths (Cestodes...

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Helminths (Cestodes and Trematodes) Cestodes (Tapeworms) • flat, segmented bodies consisting of a head (scolex) and series of segments (proglottids) • adults are all parasitic • in humans, occur in either of 2 forms: i) mature tapeworms in g.i. tract ii) larval cysts embedded in liver, lungs, muscles, brain, eye, or other tissues Common Cestodes of Humans Infection Developmental Stage in Humans Transmission Source Mode of Transmission Taenia saginata Tapeworm Beef Ingestion of cysts Taenia solium Tapeworm Pork Ingestion of cysts Cysticercosis Cysticerci Humans Ingestion of eggs Diphyllobothriasis Tapeworm Freshwater fish Ingestion of fish Echinococcosis Larval cysts Dogs / canines Ingestion of eggs Taenia saginata (Beef tapeworm) • areas of cattle husbandry where humans feces are not disposed of properly: Africa, Mexico, Argentina, Middle Europe, Central Asia • most cases in Canada are imported • can grow up to 10 metres; lives in upper half of small intestine • most infected individuals harbour only one adult worm Clinical Manifestations • most people are asymptomatic • mild abdominal cramps or malaise • proglottids are motile - may be found in perineum or on clothing or in feces
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This note was uploaded on 05/09/2010 for the course LMP 232 taught by Professor Crandall during the Spring '10 term at University of Toronto- Toronto.

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16. Helminths 2 - Cestodes (Tapeworms) Helminths (Cestodes...

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