Micro Test 3: Worms 2

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Micro Test 3: Worms 2
2012-12-07 02:05:45

Worms 2
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  1. Mosquitoes can transmit which worm?
    Where does this worm live?
    • Filariasis
    • Lymphatics --> edema
  2. Acute/ Chronic Inflammatory Disease is caused by
  3. Elephantitis is caused by
  4. Chyluria
    Rupture of varices into the urinary tract.  Caused by filariasis.
  5. Filariasis tx?
    Diethylcarbamazine (DEC)- kills microfilia
  6. Transmitted via the bite of black flies or buffalo gnats
    Onchocerca volvulus
  7. What form of Onchocerca volvulus is released into skin?
    Infective larvae penetrate skin and mature into adults (fibrous subcuatneous nodules).  These release unsheated microfiliarie into skin.
  8. Diagnostic stage of Onchocerciasis
    Microfilariae migrating through the skin
  9. Hanging groin
  10. What is the most common symptoms of Onchocerciasis?
    Eye lesions ("snow flake" corneal opacities)
  11. Snow flake corneal opacities are seen in
  12. Onchocerciasis tx?
    • Ivermectin
    • Nodulectomy
  13. Dog heartworm
    Dirofilaria immitis
  14. Raccoon heartworm
    D. tenuis
  15. Mazzotti rxns?
    Seen in?
    • Intense pruritic rxn w/ erythema, edem and papules upon microfilarial death.
    • Onchocerciasis
  16. Nodules occur in lungs (coin lesions) of humans
  17. How Dirofilarisis transmitted?
    Infected larvae are introduced into man by mosquito bite.
  18. No microfilaria are seen in blood because the worms can't reach maturity in humans by
  19. How does tapeworm get nutrients?
    No digestive tract, absorbs nutrients through the skin
  20. Taenia saginata
    Beef tapeworm
  21. Taenia solium
    Pork tapeworm
  22. Tapeworm Terminology:
    Head or attachment portion of tapeworm, attachment may be by suckers, hooks (armed) or both
  23. Tapeworm Terminology:
    Projection of scolex that may or may not contain hooks
  24. Tapeworm Terminology:
    Entire chain of proglottids
  25. Tapeworm Terminology:
    Segments containing reproductive organs
  26. Tapeworm Terminology:
    Spherical, six hooked tapeworm larvae
  27. How is Taenia transmitted?
    Eating poorly cooked beef or pork containing encysted infectious larvae (cyticerci)
  28. Eatin poorly cooked beef or pork can cause
  29. Gravid proglottids passed in feces of
  30. What does Taenia pass in feces?
    Eggs, gravid proglottids
  31. Taenia saginata or Taenia solium:
    4 suckersUnarmed rostellumNO hooks
    Taenia saginata
  32. Taenia saginata or Taenia solium:
    4 suckers
    Armed rostellum
    Double row of 22-32 hooks
    Taenia solium
  33. How many lateral uterine branches?
    T. saginata:
    T. solium:
    • T. saginata: 15-30
    • T. solium: 7-12
  34. Diagnosis of Taenia
    Recovery of Taenia eggs in feces, eggs of two species are identical
  35. Taenia tx?
    • Praziquantel
    • Niclosamide
  36. Life Cycle of Cysticercosis
    • Eggs hatch in the stomach and SI. 
    • Oncospheres use 6 hooklets to penetrate intestinal epithelium and go into lymphatic and vascular systems.
    • Oncospheres develop to cyticerci- a fluid filled bladder worm with an inverted scolex
    • Most frequently symptomatic in CNS
  37. Cysticerci
    Fluid-filled bladder worm w/ an inverted scolex
  38. Cysterci develop from
    Taenia solium --> Oncospheres --> Cysticerci
  39. Cysticerci is most frequently symptomatic in the
  40. What is the most common presentation of neurocysticercosis?
  41. Can cause parenchymal cysts (majority), meningeal cysts, ventricular cysts, spinal cord cysts
  42. Cystercercosis cerebral damage results from?
    Pressure necrosis and inflammation
  43. Calcified and uncalcified cysts on x-ray or CAT scans in brain?
  44. Cysticercosis tx?
    • Albendazole (parenchymal cysts)
    • Corticosteroids (dampens inflammatory response in brain cysts)
  45. Why do you conduct an opthalmic exam prior to drug tx of Cysticercosis?
    Chemotherapy is NOT recommended for ocular cysts, surgical removal is often possible
  46. Transmission of Dipylidium caninum
    Ingestion of fleas containing infective cyticerci
  47. Infective ________ develop from eggs in flea larvae, are still present in adult fleas, and infect humans when ingested.
    Cysticercoid larvae
  48. Tx of Dipylidium caninum
    • Praziquantal
    • Niclosamide
  49. 2 species of Echinococcus
    • E. granulosus
    • E. mulitlocularis
  50. When carnivores ingest visceral organs from infected herbivores, the scolesces from teh cyst attach to the small intestine and develop to adults.
  51. Produce space occupying lesions, pressure exerted by growing cyst mimcit those of expanding tumors
    Echniococcus granulosus
  52. Chronic signs include heptomegaly, obstructive jaundice, epigastric pain, bloatin, nausea, indigesstin
    Hepatic Hydatid Disease (Echinococcus granulosus)
  53. Hepatic Hydatid Disease
    Echinococcus granulosus
  54. Cyst rupture leads to acute symptoms in
    Echinococcus granulosus
  55. Echinococcus granulosus tx?
    • Albendazole
    • Praziquantel (prior to surgery or for cyst leakage)
  56. Invasive tumor like thing w/ hylanine membrane is much thinner than E. ganulosus
    E. multilocularis
  57. Improperly cooked fish can lead to infection with
    Diphyllobothrium latum
  58. Name 3 host Diphyllobothrium latum requires
    • Definitive hosts (Humans and fish eating carnivores)
    • First Int. Hosts (Copepods)
    • Second Int. Hosts (Freshwater fish)
  59. Diphyllobothrium latum:  Develop into ____ with a rudimentary scolex withing the muscles of fish