Question 1

The eggs of the A.lumbricoides worm are ingested and hatched in the duodenum,penetrate the intestinal wall,and migrate to the hepatic portal circulation.Its geographic distribution and infection rate are associated with:

Accepted Answer

A)  institutional crowding.
B)  poor sanitation.
C)  day care centers.
D)  moist warm soil.E) A) and B)
F) A) and C) B

Question 2

Direct penetration of which of the following worms results in tissue damage at the site of attachment,blood loss,and an acute gastrointestinal phase demonstrated by an increased eosinophilia?

Accepted Answer

A)  Whipworm
B)  Pinworm
C)  Threadworm
D)  HookwormE) A) and B)
F) B) and D)

Question 3

A 36-year-old man entered the emergency department with bleeding and weight loss several weeks after returning from a trip to South America.A stool sample was taken and microscopically examined.Barrel-shaped eggs with bipolar plugs were observed.The organism can be identified as:

Accepted Answer

A)  T.trichiura.
B)  A.duodenale.
C)  N.americanus.
D)  S.stercoralis.E) B) and C)
F) A) and B)

Question 4

Rhabditiform larvae measuring 275 mm with a long buccal capsule and a small genital primordium was identified as hookworm.Which one of the following statements explains this discrepancy?

Accepted Answer

A)  A technical error occurred in identification.
B)  The larvae characteristics represent S.stercoralis;therefore the organism was incorrectly reported out.
C)  The larvae characteristics represent pinworm;therefore the organism was incorrectly reported out.
D)  No error occurred.Hookworm is the correct identification for an organism with these characteristics.E) B) and D)
F) A) and D) D

Question 5

A 4-year-old boy attended day care 3 days per week.He was irritable,and his parents noticed that he had persistent perianal itching.A sticky paddle was pressed against the perianal region and sent to the laboratory for testing.The eggs microscopically observed would most likely have which one of the following morphologic features?

Accepted Answer

A)  Long with a short buccal cavity
B)  Thin shell with internal granules
C)  Bipolar plugs
D)  Flat-sided,football-shapedE) A) and D)
F) B) and C) D

Question 6

The larvae of the worm S.stercoralis are the most common found in human stool specimens.Depending on the fecal transit time through the intestine and the patient's condition,both rhabditiform and rare filariform may be present.The treatment of choice for uncomplicated infections is:

Accepted Answer

A)  metronidazole.
B)  ivermectin.
C)  pyrantel pamoate.
D)  combination antihelminthic and board-spectrum antibiotics.E) A) and B)
F) B) and C)

Question 7

A short buccal capsule,large bulb on the esophagus,and prominent genital primordium are all characteristics of which worm?

Accepted Answer

A)  T.trichiura
B)  Capillaria philippinensis
C)  S.stercoralis
D)  A.lumbricoidesE) B) and C)
F) C) and D)

Question 8

The infective larvae of the parasite S.stercoralis penetrate the skin and migrate through the circulatory system to the heart and lungs.The organism enters the bronchial tree and is then swallowed,entering the digestive tract,where the organism matures into an adult worm.This parasite is classified as which type of infection?

Accepted Answer

A)  Pinworm
B)  Threadworm
C)  Whipworm
D)  HookwormE) A) and D)
F) A) and B)

Question 9

The most common and largest roundworm encountered is:

Accepted Answer

A)  Trichuris trichiura.
B)  Strongyloides stercoralis.
C)  Ascaris lumbricoides.
D)  Necator americanus.E) A) and B)
F) A) and C)

Question 10

Löffler syndrome is associated with which roundworm infection?

Accepted Answer

A)  S.stercoralis
B)  Ancylostoma duodenale
C)  Trichostrongylus spp.
D)  A.lumbricoidesE) A) and D)
F) A) and B)

Exam 49: Intestinal Nematodes

The eggs of the A.lumbricoides worm are ingested and hatched in the duodenum,penetrate the intestinal wall,and migrate to the hepatic portal circulation.Its geographic distribution and infection rate are associated with:

Correct Answer
verified
B

Direct penetration of which of the following worms results in tissue damage at the site of attachment,blood loss,and an acute gastrointestinal phase demonstrated by an increased eosinophilia?

Correct Answer
verified

A 36-year-old man entered the emergency department with bleeding and weight loss several weeks after returning from a trip to South America.A stool sample was taken and microscopically examined.Barrel-shaped eggs with bipolar plugs were observed.The organism can be identified as:

Correct Answer
verified

Rhabditiform larvae measuring 275 mm with a long buccal capsule and a small genital primordium was identified as hookworm.Which one of the following statements explains this discrepancy?

Correct Answer
verified
D

Correct Answer
verified
D

The larvae of the worm S.stercoralis are the most common found in human stool specimens.Depending on the fecal transit time through the intestine and the patient's condition,both rhabditiform and rare filariform may be present.The treatment of choice for uncomplicated infections is:

Correct Answer
verified

A short buccal capsule,large bulb on the esophagus,and prominent genital primordium are all characteristics of which worm?

Correct Answer
verified

Correct Answer
verified

The most common and largest roundworm encountered is:

Correct Answer
verified

Löffler syndrome is associated with which roundworm infection?

Correct Answer
verified

Exam 49: Intestinal Nematodes

The eggs of the A.lumbricoides worm are ingested and hatched in the duodenum,penetrate the intestinal wall,and migrate to the hepatic portal circulation.Its geographic distribution and infection rate are associated with:

Correct AnswerverifiedB

Direct penetration of which of the following worms results in tissue damage at the site of attachment,blood loss,and an acute gastrointestinal phase demonstrated by an increased eosinophilia?

Correct AnswerverifiedShow Answer

A 36-year-old man entered the emergency department with bleeding and weight loss several weeks after returning from a trip to South America.A stool sample was taken and microscopically examined.Barrel-shaped eggs with bipolar plugs were observed.The organism can be identified as:

Correct AnswerverifiedShow Answer

Rhabditiform larvae measuring 275 mm with a long buccal capsule and a small genital primordium was identified as hookworm.Which one of the following statements explains this discrepancy?

Correct AnswerverifiedD

Correct AnswerverifiedD

The larvae of the worm S.stercoralis are the most common found in human stool specimens.Depending on the fecal transit time through the intestine and the patient's condition,both rhabditiform and rare filariform may be present.The treatment of choice for uncomplicated infections is:

Correct AnswerverifiedShow Answer

A short buccal capsule,large bulb on the esophagus,and prominent genital primordium are all characteristics of which worm?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The most common and largest roundworm encountered is:

Correct AnswerverifiedShow Answer

Löffler syndrome is associated with which roundworm infection?

Correct AnswerverifiedShow Answer

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified