Nematodes

1. 1A 13-year-old boy from India was brought to the emergency room with a prolapsed rectum. Examination of the rectum reveals small worms that resemble whips attached to the mucosa. A stool sample reveals eggs that are barrel shaped, with bipolar plugs. Which of the following is the most likely cause?

   1. AEchinococcus granulosus
   2. BTrichuris trichiura
   3. CAscaris lumbricoides
   4. DEnterobius vermicularis
2. 2Pigs or dogs are the source of human infection by each of the following parasites EXCEPT:
   
   

   1. AEchinococcus granulosus
   2. BTaenia solium
   3. CTrichinella spiralis
   4. DAscaris lumbricoides
3. 3At a school nurse's request, a clinic in rural South Carolina sees a 9-year-old girl who appears listless and inattentive, although hearing and visual testing has been within normal limits. The physician finds the child thin, with the "potbelly" of malnutrition, and orders a fecal exam and CBC. The CBC reveals a microcytic, hypochrornic anemia, and the fecal exam detects brown, oval nematode eggs approximately 65 microns in size, too numerous to count. What was the most likely means by which this child was infected?

   1. AIngestion of ova
   2. BIngestion of cysts in muscle
   3. CSkin penetration by larvae
   4. DMosquito transmission of sporozoites
4. 4A 4-year-old boy presents to his pediatrician with intense perianal itching. His mother explains that the child has also been extremely irritable during the day and has not been sleeping well at night. Eggs with a flattened side were identified by the laboratory technician from a piece of scotch tape brought in by the parent. Infection with which of the following organisms is most likely?

   1. ATrichuris trichiura
   2. BEnterobius vermicularis
   3. CAscaris lumbricoides
   4. DEntamoeba histolytica
5. 5The mother of a 4-year-old child notes that her child is sleeping poorly and scratching his anal area. You suspect the child may have pinworms. Which one of the following is the BEST method to make that diagnosis?

   1. AExamine transparent adhesive tape for the presence of eggs
   2. BExamine a blood smear for the presence of microfilaria
   3. CExamine the stool for the presence of trophozoites
   4. DExamine the stool for the presence of cysts
6. 6Each of the following statements concerning Ascaris lumbricoides is correct EXCEPT:

   1. AA. lumbricoides is transmitted by ingestion of eggs.
   2. BA. lumbricoides can cause pneumonia.
   3. CBoth dogs and cats are intermediate hosts of A. lumbricoides.
   4. DA. lumbricoides is one of the largest nematodes.
7. 7Each of the following statements concerning Strongyloides stercoralis is correct EXCEPT:
   
   

   1. AMigrating larvae of S. stercoralis induce a marked eosinophilia.
   2. BS. stercoralis produces filariform larvae.
   3. CS. stercoralis is acquired by ingestion of eggs.
   4. DS. stercoralis undergoes a free-living life cycle in soil.
8. 8Acute pancreatitis may be cause by

   1. AAscaris lumbricoids
   2. BEntorboius vermicularis
   3. CAncylostoma duodenale
   4. Drichuris trichiura
9. 9Digestive system of nematodes have two openings and in form of

   1. Amuscules
   2. Bneuron
   3. Cdigestive tract
   4. Dalimentary canal
10. 10There are four bands of muscles in Nematodes, two are dorso-lateral and two

    1. Aventro-lateral
    2. Bdorso-ventral
    3. Cdorso-lateral
    4. Dlatero-ventral

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MCQ for 3rd year medical students

Autor

Nada Medhat

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English

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