Question 1

Which of the following statements comparing Enterobius vermicularis and Diphyllobothrium latum is incorrect?

Accepted Answer

A)   D. latum has fish as an intermediate host, whereas E. vermicularis has no intermediate host.
B)   Both helminths affect primarily children.
C)   Symptoms of both infections are mild.
D)   E. vermicularis is best treated with mebendazole, whereas D. latum is susceptible to praziquantel.E) B) and D)
F) All of the above B

Question 2

Boiling will not inactivate Giardia lamblia cysts in contaminated water.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following helminths is correctly paired with its portal of entry?

Accepted Answer

A)   Schistomoma species - carried by an insect vector into human
B)   Ascaris lumbricoides - enters through the skin
C)  Taenia solium - eggs or larvae can be ingested
D)  Enterobius vermicularis - sexual transmissionE) A) and B)
F) All of the above

Question 4

The most common cause of liver cancer in the United States is hepatitis ______ virus.

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) A) and B)
F) None of the above

Question 5

Helicobacter pylori causes ______.

Accepted Answer

A)  gastritis
B)  duodenal ulcers
C)  stomach ulcers
D)  increased risk for stomach cancer
E)  All of the choices are correct.F) A) and D)
G) C) and D)

Question 6

Which of the following statements regarding Campylobacter jejuni is incorrect?

Accepted Answer

A)  It causes fever and a watery to bloody diarrhea.
B)  It produces an enterotoxin that stimulates diarrhea.
C)  It infects the stomach.
D)  It is transmitted through ingestion of contaminated chicken, meat, milk, or water.
E)  The cells are gram-negative, curved rods with darting motility.F) B) and D)
G) A) and C) C

Question 7

The most dangerous outcome of a Taenia solium infection occurs when humans ingest tapeworm eggs rather than cysticerci.This type of transmission occurs by

Accepted Answer

A)  consuming "chitlins," pig intestines from an infected animal.
B)  drinking water contaminated with feces from infected animals.
C)  consuming undercooked pork with encysted Taenia.
D)  consuming plants that haven't been thoroughly washed of soil.E) A) and B)
F) B) and C)

Question 8

Defenses of the GI tract against pathogens include ______.

Accepted Answer

A)  mucus, acid, and saliva
B)  secretory IgA and lysozyme
C)  peristalsis
D)  GALT (gut-associated lymphoid tissue) 
E)  All of the choices are correct.F) A) and D)
G) A) and E)

Question 9

Salmonella are ______.

Accepted Answer

A)  methane producers
B)  motile
C)  gram-positive bacilli
D)  lactose fermenters
E)  All of the choices are correct.F) A) and B)
G) B) and E)

Question 10

Which of the following is not a normal causative agent of acute diarrhea with vomiting (food poisoning) ?

Accepted Answer

A)  Clostridium perfringens
B)  Staphylococcus aureus
C)  Bacillus cereus
D)  Clostridium difficileE) B) and D)
F) A) and C)

Question 11

Research does not indicate a link between the numbers and types of bacteria causing periodontitis and thicker carotid arteries in an individual.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?

Accepted Answer

A)  Stomach fluid; high pH
B)  Bile; lactoferrin
C)  Pancreatic fluid; IgE
D)  Saliva; lysozymeE) B) and D)
F) A) and C)

Question 13

General symptoms of helminth infection includes all of the following except

Accepted Answer

A)  eggs, larvae, or adult worms found in feces.
B)  intense abdominal pain.
C)  increased eosinophil count.
D)  vague nausea.
E)  increased sensitivity to helminth antigens.F) B) and C)
G) A) and D)

Question 14

Pathogenicity islands are

Accepted Answer

A)  gene clusters that confer the ability to become pathogenic.
B)  closely related groups of pathogenic enteric organisms.
C)  enzymes like proteases and hemolysins that promote pathogenesis.
D)  a lymphoid tissue present in the small intestine.E) B) and D)
F) B) and C)

Question 15

Which of the following statements regarding trichinosis is incorrect?

Accepted Answer

A)  Coiled larvae are encysted in skeletal muscle.
B)  The disease can be transmitted by the fecal-oral route.
C)  Larvae migrate from intestines to blood and various body tissues.
D)  The disease is associated with undercooked pork.E) A) and B)
F) B) and D)

Question 16

The gastrointestinal microbiota has been implicated in the development of

Accepted Answer

A)  non-infectious diseases like obesity.
B)  appropriate immune responses to microbial antigens.
C)  dental plaque.
D)  All of the responses are correct.E) A) and B)
F) A) and D)

Question 17

The most definitive test to diagnose a helminth infection is

Accepted Answer

A)  a blood cell count to look for elevated levels of eosinophils.
B)  a good medical history of the patient, including recent foreign travel.
C)  an ova and parasite smear for microscopy.
D)  a serological test for the presence of anti-helminthic antibodies.E) A) and C)
F) A) and B) C

Question 18

Because the gut microbiome is a tremendously diverse population, an infection can be viewed as

Accepted Answer

A)  the presence of helminths instead of the normal bacteria in the gut.
B)  an increase in the overall number of microbes in the gut.
C)  a shift in the relative proportions of the microbes in this environment.
D)  a change in a person's enterotype.E) B) and C)
F) B) and D)

Question 19

"Rice-water stools" are associated with disease caused by which organism?

Accepted Answer

A)  Vibrio vulnificus
B)  Helicobacter pylori
C)  Vibrio cholerae
D)  Campylobacter jejuni
E)  Vibrio parahaemolyticusF) A) and B)
G) A) and C)

Question 20

Enterobius vermicularis is

Accepted Answer

A)  a whipworm.
B)  common only to the tropics and subtropics.
C)   an intestinal helminth that easily contaminates fingers and fomites.
D)  often fatal in heavy infestations.
E)  All of the choices are correct.F) A) and D)
G) All of the above

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Which of the following statements comparing Enterobius vermicularis and Diphyllobothrium latum is incorrect?

Correct AnswerverifiedB

Boiling will not inactivate Giardia lamblia cysts in contaminated water.

Correct AnswerverifiedShow Answer

Which of the following helminths is correctly paired with its portal of entry?

Correct AnswerverifiedShow Answer

The most common cause of liver cancer in the United States is hepatitis ______ virus.

Correct AnswerverifiedShow Answer

Helicobacter pylori causes ______.

Correct AnswerverifiedShow Answer

Which of the following statements regarding Campylobacter jejuni is incorrect?

Correct AnswerverifiedC

The most dangerous outcome of a Taenia solium infection occurs when humans ingest tapeworm eggs rather than cysticerci.This type of transmission occurs by

Correct AnswerverifiedShow Answer

Defenses of the GI tract against pathogens include ______.

Correct AnswerverifiedShow Answer

Salmonella are ______.

Correct AnswerverifiedShow Answer

Which of the following is not a normal causative agent of acute diarrhea with vomiting (food poisoning) ?

Correct AnswerverifiedShow Answer

Research does not indicate a link between the numbers and types of bacteria causing periodontitis and thicker carotid arteries in an individual.

Correct AnswerverifiedShow Answer

Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?

Correct AnswerverifiedShow Answer

General symptoms of helminth infection includes all of the following except

Correct AnswerverifiedShow Answer

Pathogenicity islands are

Correct AnswerverifiedShow Answer

Which of the following statements regarding trichinosis is incorrect?

Correct AnswerverifiedShow Answer

The gastrointestinal microbiota has been implicated in the development of

Correct AnswerverifiedShow Answer

The most definitive test to diagnose a helminth infection is

Correct AnswerverifiedC

Because the gut microbiome is a tremendously diverse population, an infection can be viewed as

Correct AnswerverifiedShow Answer

"Rice-water stools" are associated with disease caused by which organism?

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Enterobius vermicularis is

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B

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C

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C

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