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Understanding Tapeworms: Life Cycle, Structure, and Zoonotic Infections

Explore the typical life cycle of tapeworms like Taenia spp., their structure, larval stages, and zoonotic implications. Learn about Cestodes, their larvae, intermediate hosts, and human infections.

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Understanding Tapeworms: Life Cycle, Structure, and Zoonotic Infections

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  1. worm in gut of final host (dog) egg packet voided onto pasture dog eats infected meat larva in gut of intermediate host (sheep) migrates to muscle CESTODESTYPICAL MODE OF LIFE OF TAPEWORMS eg. Taenia ovis

  2. hooks sucker neck produces proglottids head is called the scolex testes uterus genital pore ovary vitelline gland tape is called the strobila gravid proglottid full of eggs >> detaches from strobila CESTODESSTRUCTURE OF ADULT CESTODES

  3. CESTODESSTRUCTURE OF LARVAL CESTODES invaginated scolex COENURUS CYSTICERCUS fluid filled cyst HEXACANTH first stage in all types endogenous cyst HYDATID CYSTICERCOID STROBILOCERCUS

  4. human final host contamination of human food with human faeces gives human cysticercosis eating pork completes usual cycle cysticerci in pig intermediate host CESTODESTAENIA CESTODES AND CYSTICERCOSIS eg. Taenia solium

  5. CESTODESECHINOCOCCUS & HYDATID DISEASE fox or dog final host Human zoonotic infection with hydatid via dog faeces hydatid cyst in intermediate host rodent intermediate host for E.multilocularis (ruminants & horses intermediate hosts for E.granulosus )

  6. dog or cat final host dog grooms and eats flea to complete life cycle larval flea metamorphoses to adult and retains infection larval cestode develops to cysticercoid in flea egg packet ingested by larval flea as intermediate host CESTODESCESTODES WITH ARTHROPODS AS INTERMEDIATE HOSTS, eg. Dipylidium caninum

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