Med parasit larval cestodes2010 - Taenia asiatica Pork...

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Taenia asiatica Pork Liver Tapeworm Cyclophyllidea
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T. asiatica: The pork liver worm ± T. saginata -like tapeworm occurring in the livers of pigs ± However… ± intermediate host is the pig rather than cattle ± cysticerci localize within the liver tissue and other viscera of pigs (not musculature and brain as with the other pork tapeworm T. solium ) ± Almost strictly a human-pig cycle ± Taeniid eggs (infectious when passed) ingested by pigs ± hexacanth embryo makes its way to the liver ± Cysticerci develop and become infectious ± human ingests the raw viscera ± Taenia asiatica is found in East Asia, i.e., China, Korea, Taiwan, the Philippines, Indonesia, and Thailand
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T. asiatica: The pork liver worm ± This species does not appear to cause cysticercosis in people ± Typically no signs associated with the infection ± nausea, dizziness, increased appetite, and various other general feelings of malaise maybe present ± Diagnosis by finding segments similar to those of Taenia saginata ± Treatment is praziquantel
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Larval Cestode (tapeworm) Infections CESTODA (the tapeworms)
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Today ± Cover tapeworms that can be present as larvae in humans (i.e. where humans can act as an intermediate host): ± Spirometra mansonoides ± Mesocestoides variabilis ± Taenia spp ± T. solium ± T. crassiceps ± T. multiceps ± T. serialis ± T. taeniaeformis ± Echinococcus spp ± E. granulosus ± E. multilocularis
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At the end of the lecture you should… ± Be able to: ± Describe the types of larval tapeworms there are (depending on species of tapeworm) ± Recognize terminology associated with cestodes and cestode infection ± Explain how humans get infected with larval tapeworms
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Big Picture ± Depending on the type of tapeworm, different larval stages are formed ± Larval tapeworms can cause disease in people ± The holdfast of the final larval stage is like that of the adult
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Larval tapeworms ± Stages in intermediate host(s): ± Diphyllobothrium and Spirometra : ± Procercoid (in copepod) ± Plerocercoid/spargana (in vertebrate) ± Mesocestoides ± ? (1 st host unknown) ± Tetrathyridia (in 2 nd intermediate host, vertebrate) ± Taeniids: Taenia and Echinococcus ± Cysticercus (in mammal) ± Strobilocercus (in mammal) ± Coenurus (in mammal) ± Hydatid cyst (unilocular or alveolar) (in mammal)
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Pseudophyllidea ± Part of the life cycle is aquatic ± Have 2 intermediate hosts ± 1 st : copepod ± 2 nd : Vertebrate ± Use paratenic hosts ± 2 most important genera: ± Diphyllobothrium, uses fish (not humans) as intermediates ± Spirometra, uses vertebrates (including humans) as intermediates
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Spirometra mansonoides: sparganosis Pseudophyllidea
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Spirometra mansonoides ± Domestic and wild felids are the definitive hosts ± can also infect dogs and raccoons ± The adult worms are found in the small intestine of the definitive host (e.g. raccoons) ± The life cycle is similar to that of Diphyllobothrium latum
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Life cycle
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Spirometra mansonoides: sparganosis ± Humans and other
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Med parasit larval cestodes2010 - Taenia asiatica Pork...

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