The Candid Test On Cestodes Review

25 Questions | Total Attempts: 63

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The Candid Test On Cestodes Review

Review cestodes


Questions and Answers
  • 1. 
    Most cyclophyllidean tapeworms are thought to be apathogenic in the definitive host.  However, recent data suggests that adults of this tapeworm may be associated with some cases of colic in horses:
    • A. 

      Anoplocephala magna

    • B. 

      Anoplocephala perfoliata

    • C. 

      Moneizia

    • D. 

      Thysanosoma

    • E. 

      Taenia pisiformis

  • 2. 
    Cats and dogs become infected with adults of Spirometra when they ingest:
    • A. 

      Eggs containing fully developed coracidia

    • B. 

      Fish containing fully developed plerocercoid larvae

    • C. 

      Non-fish vertebrates containing fully developed plerocercoid larvae

    • D. 

      Copepods containing fully developed procercoid larvae

    • E. 

      Copepods containing fully developed third-stage larvae

  • 3. 
    Which of the following tapeworm larvae in the intermediate host grows rapidly and aggressively, is invasive, and is impossible to completely remove at surgery?
    • A. 

      Multilocular hydatid cyst of Echinococcus multilocularis

    • B. 

      Unilocular hydatid cyst of Echinococcus granulosus

    • C. 

      Strobilocercus of Taenia taeniaeformis

    • D. 

      Cysticercus of Taenia saginata

    • E. 

      None of the above

  • 4. 
    Taenia solium infects humans as a definitive host and pigs as an intermediate host.  However, in some cases humans can become aberrantly infected with cysticerci of this tapeworm.  What system is most severely affected in humans due to cysticerci of Taenia solium?
    • A. 

      Renal

    • B. 

      Neurologic

    • C. 

      Pulmonary

    • D. 

      Hepatic

    • E. 

      Orthopedic (degenerative joint disease)

  • 5. 
    Prevention of re-infection of a dog with Taenia pisiformis requires:
    • A. 

      Instituting a stringent flea control program

    • B. 

      Instituting a stringent tick control program

    • C. 

      Restricting access to rodent prey

    • D. 

      Restricting access to rabbit prey

    • E. 

      Refraining from feeding the dog raw or undercooked beef

  • 6. 
    Humans become infected with Echinococcus granulosus when they:
    • A. 

      Ingest eggs from the feces of an infected dog

    • B. 

      Ingest the unilocular hydatid cyst in the liver of an infected sheep

    • C. 

      Ingest the multilocular hydatid cyst in the liver of an infected rodent

    • D. 

      Ingest the cysticercus in the liver of an infected cow

    • E. 

      Ingest the plerocercoid larvae in the muscle of any non-fish vertebrate

  • 7. 
    Ruminants become infected with Moneiza when they ingest cysticercoid laravae that have developed within:
    • A. 

      Fleas

    • B. 

      Bark lice

    • C. 

      Snails or slugs

    • D. 

      Ants

    • E. 

      Orbatid mites

  • 8. 
    Cyclophyllidean tapeworms _____________ whereas Pseudophyllidean tapeworms __________.
    • A. 

      Are terrestrial parasites/ are aquatic parasites

    • B. 

      Have a scolex with suckers/ have a scolex with bothria

    • C. 

      Cause cysticercosis/ sparganosis

    • D. 

      All of the above are correct

    • E. 

      None of the above are correct

  • 9. 
    Hydatid cysts are found in a variety of wild and domestic animals that serve effectively as intermediate hosts.  In some of these species the cysts are often sterile.  Dogs become infected with the adult tapeworms only if the cysts contain viable _______________, and, in the pastoral cycle, the normal intermediate hosts are __________.
    • A. 

      Protoscolices/ sheep

    • B. 

      Hexacanth embryos/ sheep

    • C. 

      Oncospheres/ dogs

    • D. 

      Hydatid sand/ moose

    • E. 

      Hexacanth embryos/ pigs

  • 10. 
    Tapeworms have sexually immature stages called "metacestodes." The infective metacestode found only in the cyclophyllidean family Mesocestoididae is termed a " _______" and the adults of these tapeworms are mainly found in ___________?
    • A. 

      Hydatid cyst/ herbivores

    • B. 

      Tetrathyridium/ omnivores

    • C. 

      Cycticercus/ omnivores

    • D. 

      Cysticercoid/ herbivores

    • E. 

      Coenurus/ omnivores

  • 11. 
    A ______________ is not a stage in the life cycle of a pseudophllidean tapeworm?
    • A. 

      Tetrathryidium

    • B. 

      Coracidium

    • C. 

      Procercoid

    • D. 

      Sparganum

    • E. 

      All of the above

  • 12. 
    Of the following tapeworms, only ____________ correctly matches the statement attached to it.  
    • A. 

      Echinococcus multilocularis: There are no hooks on its scolex and it is sometimes pathogenic in horses

    • B. 

      Anoplocephala perfoilata: The adult is found in the bile ducts and its proglottids are fringed on the posterior border

    • C. 

      Moniezia benedini: This is a large tapeworm of sheep that uses a grass mite as an intermediate host

    • D. 

      Thysanoma actinioides: The cysticercoides are transmitted by fleas

    • E. 

      Dipylidium caninum: The metacestodes cause cysticercosis in human beigns

  • 13. 
    All of the following tapeworms infect human beings but only ________ and ______ can do so by autoinfection
    • A. 

      Taenia saginata/ Dipylidium caninum

    • B. 

      Echinococcus granulosus/ Vampirolepis nana

    • C. 

      Taenia solium/ Taenia saginata

    • D. 

      Vampirolepis nana/ Taenia solium

    • E. 

      Dipylidium caninum/ Vampirolepis nana

  • 14. 
    Spirometra  mansonoides is a pseudophyllidean tapeworm that causes sparganosis in human beings, dogs and cats.  Considering that plerocercoids become adult tapeworms and procercoids become plerocercoids, developmental stages acquired by ingestion of infected __________ would be the most likely source of such infections.
    • A. 

      Frogs

    • B. 

      Copepods

    • C. 

      Snakes

    • D. 

      Rodents

    • E. 

      Dogs

  • 15. 
    In infections with cestodes of the family Taeniidae, the __________ causes the greater damage, and always in the ___________.
    • A. 

      Metacestode/ intermediate host

    • B. 

      Adult/ paratenic host

    • C. 

      Adult/ definitive host

    • D. 

      Metacestode/ definitive host

    • E. 

      Adult/ intermediate host

  • 16. 
    Adults tapeworms of Mesocestoides spp. often infect dogs, although certain wildlife species are preferred hosts.  Dogs sometimes become infected with a larval stage of Mesocestoides.  In such infection, __________ are typicaly found in the ___________.
    • A. 

      Procercoids/ anterior mesenteric artery

    • B. 

      Cysticercoids/ peritoneal cavity

    • C. 

      Cysticercoids/ brain

    • D. 

      Coenuri/ muscles

    • E. 

      Tetrathyridia/ peritoneal cavity

  • 17. 
    Tapeworms have sexually immature stages called "metacestodes."  Which of the following metacestodes is the transmission stage of the Family Anoplocephalidae?
    • A. 

      Hydatid cyts

    • B. 

      Tetrathyridium

    • C. 

      Cycticercus

    • D. 

      Cysticercoid

    • E. 

      Coenurus

  • 18. 
    In infections with cestodes of the family Taeniidae, the _________ stage causes the least damage, and is always found in the __________.
    • A. 

      Metacestode/ intermediate host

    • B. 

      Adult/ paratenic host

    • C. 

      Adult/ definitive host

    • D. 

      Metacestode/ definitive host

    • E. 

      Adult/ intermediate host

  • 19. 
    Thysanoma actinoides is a tapeworm that
    • A. 

      Sheep acquire from ingesting encysted metacercariae from grass

    • B. 

      Produce liver cysts that sometimes metastasize to other organs in humans infections

    • C. 

      Is transmitted as a cysticercoid in fleas

    • D. 

      Is found in the small intestine and bile ducts and has fringed proglottids

    • E. 

      Attaches near theileocecal valve and is sometimes thought to be pathogenic in horses

  • 20. 
    Hydatid cysts of Echinococcus granulosus are found in a wide variety of animals.  The infective cysts of this tapeworm contain __________, and  the normal intermediate hosts are ___________.
    • A. 

      Vermiform larvae/ dog

    • B. 

      Coracidia/ horse

    • C. 

      Protscolices/ sheep

    • D. 

      Hexacanths/ cow

    • E. 

      Coenuri/ pigs

  • 21. 
    The infective stage of a pseudophyllidean tapeworm is a _____________.
    • A. 

      Strobilocercus

    • B. 

      Hydatid cyst

    • C. 

      Plerocercoid

    • D. 

      Cysticercoid

    • E. 

      Acanthor

  • 22. 
    Considering specific habits and behaviors, which of the following definitive hosts would most likely become infected with a pseudophyllidean tapeworm?
    • A. 

      Elk

    • B. 

      Moose

    • C. 

      Grizzly bear

    • D. 

      Rabbit

    • E. 

      Squirrel

  • 23. 
    The tapeworm with a metacestode that produces a condition referred to as "sparganosis" belongs to the genus _________ and the metacestode is the __________.
    • A. 

      Mesocetoides/ tetrathyridium

    • B. 

      Spirometra/ plerocercoid

    • C. 

      Diphyllobothrium/ procercoid

    • D. 

      Taenia/ coenurus

    • E. 

      Spargana/ coracidium

  • 24. 
    The condition in cattle referred to as "measly beef" is caused by _______ of ________.
    • A. 

      Cysticerci/ Taenia saginata

    • B. 

      Coenuri/ Taenia solium

    • C. 

      Cysticerci/ Taenia pisiformis

    • D. 

      Coenuri/ Taenia saginata

    • E. 

      Cysticerci/ Taenia bovis

  • 25. 
    The extremely large tapeworms found in the small intestines of cattle and sheep belong to the genus ___________.
    • A. 

      Taenia

    • B. 

      Moniezia

    • C. 

      Anoplocephala

    • D. 

      Davainea

    • E. 

      Cittotaenia