Parasitology- worms

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Author:
lacamp11
ID:
211477
Filename:
Parasitology- worms
Updated:
2013-04-04 20:12:42
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Parasitology worms
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Description:
Roundworms, hooks, whips, tapeworms
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  1. Roundworms found in canine species.
    Toxocara canis
  2. Roundworms found in feline species and in humans.
    Toxocara cati
  3. Roundworms found in canine and feline species
    Toxascaris leonina
  4. Which parasitic worm has an "arrowhead" shaped anterior portion?
    Roundworms
  5. Is the life cycle of roundworms direct or indirect?
    direct
  6. What are the four migration routes for roundworms?
    • 1.) tracheal
    • 2.) somatic
    • 3.) mucosal
    • 4.) in utero
  7. True/False: adult roundworms live in the large intestine.
    False: adult roundworms live in the small intestine.
  8. App. how many eggs can an adult female roundworm produce in one day?
    200,000
  9. What is the prepatent period for Toxocara canis?
    1 month
  10. What is the prepatent period for Toxocara cati?
    2 months
  11. The infective stage of roundworm larvae takes how long to develop inside the egg?
    2-4 weeks; longer if environmental conditions not right.
  12. List three specific clinical signs of a roundworm infestation.
    • Rough hair coat
    • Ascities
    • Stunted growth
  13. What is the main way roundworms cause harm to the host?
    block absorption of nutrients, causing clinical signs of malnutrition.
  14. What is the name of the OTC anthelmintic that is specifically made to treat roundworms, but not other types of worms?
    Piperazine
  15. What is the zoonotic potential for roundworms?
    • Toxocara can cause Visceral Larval Migrans in humans. Ocular Larval Migrans is another form of VLM.
    • Baylisascaris (racoon roundworm) can cause VLM to the CNS.
  16. What are the two genus' of hookworms?
    • Ancylostoma
    • Uncinaria
  17. Describe the apperance of an adult hookworm.
    Small (app 1/4 inch) reddish brown, anterior end bent like a hook.
  18. How many eggs can an adult female hookworm produce in one day?
    20,000
  19. What is the main way hookworms cause harm to the host?
    Bite into lining of small intestine, suck blood, leave for another site, causing significant blood loss.
  20. How much blood loss can one adult hookworm cause per day?
    1/2-1cc
  21. Do hookworms have an indirect or direct life cycle?
    Direct
  22. How long does it take for a hookworm egg to develop into larvae?
    • 12-24 hrs.
    • Larvae become infective in one week (hatch out of egg)
  23. What are the three routes of infection for hookworms?
    • Oral
    • In utero
    • Cutaneous
  24. What is the prepatent period for hookworms?
    2 weeks
  25. How do puppies and kittens usually become infected with hookworms through the mother?
    Mammary
  26. Hookworms:
    What age animals do you see peracute clinical signs in? What are these clinical signs?
    • Puppies & Kittens ~ 2 weeks old.
    • "Fading Puppy Syndrome" severe-fatal  anemia (pale MM, prolonged CRT, low PCV, lethargy, death)
  27. Hookworms:
    What age animals have acute clinical signs? What are these clinical signs?
    • Just weaned animals
    • Severe anemia, diarrhea, melena
  28. What is the zoonotic potential for hookworms?
    Hookworms can penetrate intact human skin and cause Cutaneous Larval Migrans (sandworms, creeping eruptions, plumbers itch)
  29. What is the scientifc name for whipworms in canine and feline (rare) species?
    Trichuris Vulpis
  30. Where do adult whipworms reside in the final host?
    Large intestine
  31. How many eggs can one adult female whipworm produce?
    2,000
  32. How do whipworms harm the host?
    Digest host tissue, suck blood
  33. What kind of blood would you see in the feces of an animal with a whipworm infection?
    Frank blood
  34. Do whipworms have an indirect or direct life cycle?
    Direct
  35. How long does it take for a whipworm egg to develop into an infective larvae?
    2-4 weeks (larvae remain in egg)
  36. What migration route do whipworms go through in the final host?
    Mucosal
  37. How long do whipworm larvae stay in the small intestine and mature before migrating to the large intestine?
    90 days
  38. What are some clinical signs of a whipworm infection?
    • Cyclic diarrhea with mucus and blood
    • Dehydration
    • Anemia
    • Colitis
    • Typhlitis
  39. What are three reasons that the ova of whipworms are not commonly observed in fecal exams?
    • Females are not very prolific egg layers
    • Ova take longer to float, up to 20 mins
    • Eggs shed cyclically, may not be in sample.
  40. What is the zoonotic potential of whipworms
    NONE
  41. What are the two genus' of tapeworms commonly encountered?
    • Dipylidium
    • Taenia
  42. What is the genus of the tapeworm with significant zoonotic potential?
    Echinococcus
  43. True/ False: tapeworms are hermaphroditic.
    True
  44. What is the head portion of the tapeworm called?
    Scolex
  45. What are the segment portions of the tapeworm called?
    Proglottids
  46. What is the term for a proglottid that contains ova?
    Gravid
  47. Which type of tapeworms have rectangular shaped proglottids?
    Taenia
  48. Which type of tapeworms have oval shaped proglottids?
    Dipylidium
  49. What are three reasons that tapeworm ova are difficult to detect in the fecal exam?
    • Ova are in proglottids, which are motile and not always found in the feces
    • Ova must be released from proglottids
    • Ova are heavy; don't float well
  50. Is the life cycle of a tapeworm indirect or direct?
    indirect
  51. What is the intermediate host for Taenia?
    Rabbits or rodents
  52. What is the intermediate host for Dipylidium?
    Fleas or lice
  53. What is the prepatent period of Dipylidium tapeworms?
    2-3 weeks
  54. What is the prepatent period of Taenia tapeworms?
    1-2 months
  55. What are the dewormers used specifically for tapeworms?
    • praziquantel (Droncit)
    • epsiprantel  (Cestex)

    Repeat 2 weeks 2-3 times

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