Chapter 9 Parasitology /Chapter 10 Parasitic Diseases

15 Questions | Total Attempts: 2854

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Chapter 9  Parasitology /Chapter 10 Parasitic Diseases

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Questions and Answers
  • 1. 
    A biology graduate student whore cently visited a tropical region of Africa presents with new visual impairment and the sensation that something is moving in her eye. She tells you that she is concerned because she had been warned about eye disease transmitted by black flies. When in Africa, she was in a river area, and despite her best efforts she received a lot of black fly bites. She also has some sub-cutaneous nodules. If her infection was acquired by black fly bite, what is the most likely causative agent?
    • A. 

      Ancylostoma braziliense

    • B. 

      Dracunculus medinensis

    • C. 

      Loaloa

    • D. 

      Onchocerca volvulus

    • E. 

      Wuchereria bancrofti

  • 2. 
    A woman who imports food from Mexico and spends several months per year in rural Mexico had to have a compound leg fracture  pinned and set in Mexico and has returned 3 days later. She now has signs of acute appendicitis and is taken to surgery in Houston. When her appendix is removed, it is found to contain a light-colored, 20.5-cm long roundworm and bile-stained, knobby eggs consistent with Ascaris. How did she acquire this infection?
    • A. 

      Ingestion of water containing filariform larvae

    • B. 

      Skin penetration by filariform larvae

    • C. 

      Skin penetration by rhabditiform larvae

    • D. 

      Ingestion of food contaminated with the eggs

    • E. 

      Inhalation of dust carrying the cysts

  • 3. 
    A patient whose major source of protein is smoked and cooked fish develops what appears to be pernicious anemia. What parasite is noted for causing a look-alike vitamin B-12 anemia in certain genetically predisposed infected individuals?
    • A. 

      Echinococcus granulosus

    • B. 

      Diphyllobothrium latum

    • C. 

      Hymenolepis nana

    • D. 

      Dipylidium caninum

    • E. 

      Taenia solium

  • 4. 
    Which of the following protozoans is free living and acquisition does not generally indicate fecal contamination?
    • A. 

      Acanthamoeba

    • B. 

      Dientamoeba fragilis

    • C. 

      Entamoeba histolytica

    • D. 

      Entamoeba coli

    • E. 

      Giardia

  • 5. 
    What is the most likely reason for a chloroquine-treated case of Plasmodium vivax relapsing?
    • A. 

      P.vivax has a significant level of chloroquine resistance

    • B. 

      P.vivax has a persistent erythrocytic stage

    • C. 

      P.vivax has a persistent exoerythrocytic stage (hypnozoite)

    • D. 

      Chloroquine is not one of the drugs of choice

  • 6. 
    How is Leishmania  donovani transmitted?
    • A. 

      Anopheles mosquito bite

    • B. 

      Black fly bite

    • C. 

      Culex mosquito bite

    • D. 

      Sand fly bite

    • E. 

      Skin penetration by trauma

  • 7. 
    How is Schistosoma haematobium transmitted?
    • A. 

      Ingestion of raw or under cooked snail, frog, or snake

    • B. 

      Invasion of filariform larvae from soil

    • C. 

      Handling aquatic birds

    • D. 

      Standing or swimming in contaminated water

    • E. 

      Tsetse fly bite

  • 8. 
    An untreated AIDS patient (CD4+count of 180 cells/mm3)  from southern California has developed progressively severe headache and mental confusion, along with ataxia and retino-choroiditis. Focal lesions are present on a computed tomography scan of his brain. No mucocutaneous lesions are found. He has been living under a bridge for the past 2 years. His level of immunoglobulin G(IgG)  to the infectious agent is high. What is the most likely explanation for how this current infection started?
    • A. 

      Earlier exposure to pigeons

    • B. 

      Earlier exposure to desert sand

    • C. 

      Reactivation of bradyzoites in cysts from an earlier infection

    • D. 

      Recent exposure to cat feces

    • E. 

      Recent exposure to bats

  • 9. 
    Which of the following is the tape worm acquired from eating undercooked pork?
    • A. 

      Dipylidium spp

    • B. 

      Echinococcus granulosus

    • C. 

      Taenia saginata

    • D. 

      Taenia solium

    • E. 

      Trichinella spiralis

  • 10. 
    What roundworm is most likely to be transmitted by ingestion of food or water contaminated with feces?
    • A. 

      Ascaris lumbricoides

    • B. 

      Enterobius vermicularis

    • C. 

      Necator americanus

    • D. 

      Taenia saginata

    • E. 

      Toxocara canis

  • 11. 
    What round worm is transmitted by filari-form larvae that are found in the soil and penetrate the skin?
    • A. 

      Dracunculus medinensis

    • B. 

      Enterobius vermicularis

    • C. 

      Strongyloides stercoralis

    • D. 

      Taenia saginata

    • E. 

      Toxocara canis

  • 12. 
    How is Clonorchis sinensis (Chinese liver fluke) most likely transmitted to humans?
    • A. 

      Fish ingestion

    • B. 

      Mosquito bite

    • C. 

      Swimming or water contact

    • D. 

      Rare beef ingestion

    • E. 

      Mango fly(Chrysops)

  • 13. 
    A rural subsistence farmer from Brazil dies of heart failure. His autopsy shows a greatly enlarged heart. What was the vector for the most likely infectious agent that may have been responsible for his death?
    • A. 

      Ixodes tick

    • B. 

      Mosquito

    • C. 

      Reduviid bug

    • D. 

      Sand fly

    • E. 

      Tsetse fly

  • 14. 
    A patient whore cently returned from camping in Canada presents with malabsorption diarrhea. How does the most likely agent cause the diarrhea?
    • A. 

      Co-infection with bacteria

    • B. 

      Enterotoxin production

    • C. 

      Suction disk attachment

    • D. 

      Tissue invasion leading to an inflammatory response and prostaglandin production

  • 15. 
    Which of the following protozoans is transmitted primarily by the motile trophozoite form?
    • A. 

      Balantidium coli

    • B. 

      Entamoeba histolytica

    • C. 

      Giardia lamblia

    • D. 

      Taenia solium

    • E. 

      Trichomonas vaginalis

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