Question 1

Just back from a trip to South America, you now have a severe diarrheal illness.Your symptoms, other than diarrhea, are pain, cramps, some fecal blood, and fever.These are symptoms of many of the gastrointestinal diseases, so that information does not help you or the doctors identify the infectious agent.Your doctor wants to send a fecal sample to the microbiology lab for them to look at it under the light microscope.Based upon this protocol selection, the physician believes that you have ______.

Accepted Answer

A)  salmonellosis
B)  hepatitis A
C)  rotavirus
D)  cholera
E)  amoebiasisF) B) and E)
G) A) and B)

Question 2

Your son has not had the MMR vaccine (measles, mumps, rubella)  because you are apprehensive about vaccines and their side effects.Your sister says that you are setting him up for a potentially damaging scenario.Which argument has the great scientific validity and why?

Accepted Answer

A)   Your sister is correct.Even if your son does not get the mumps now when he is young, but gets the infection later in life, there is a possibility of severe side effects.
B)   Your sister is correct in her warnings.If your son gets a severe case of mumps, he will likely develop a fatal secondary infection.
C)   You are correct in protecting your son.If you can keep him from getting mumps when young, it is no longer a problem.It is simply a childhood disease.
D)   You are correct to be apprehensive because vaccines have been the cause of autism in children.E) B) and C)
F) A) and B)

Question 3

All of the following diseases can be transmitted by drinking contaminated water except ______.

Accepted Answer

A)  trichinosis
B)   campylobacter
C)   cyclosporiasis
D)   giardiasis
E)   cryptosporidiosisF) A) and E)
G) C) and E)

Question 4

In the absence of dietary carbohydrates, bacteria do not cause tooth decay.

Accepted Answer

A) True 
 B)False

Question 5

There are vaccines for immunity to the Hepatitis B virus.

Accepted Answer

A) True 
 B)False

Question 6

The primary viral cause of chronic diarrhea globally is ______.

Accepted Answer

A)  rotavirus
B)  Cryptosporidium
C)  arbovirus
D)  adenovirus
E)  norovirusF) B) and C)
G) None of the above

Question 7

Paramyxoviruses evade the host immune system by

Accepted Answer

A)  infecting only red blood cells.
B)  entering new cells by inducing syncytia formation.
C)  producing an inhibitor specific for lymphocyte receptors.
D)  a display of host antigens on its surface.E) B) and C)
F) A) and B)

Question 8

Which of the following statements is not true regarding Clostridium difficile?

Accepted Answer

A)  Infection is precipitated by broad-spectrum antibiotic therapy.
B)  It produces "rice-water" stools.
C)  It is part of the normal intestinal biota.
D)  It is also called pseudomembranous colitis.
E)  It is a gram-positive, endospore-forming rod.F) B) and E)
G) B) and C)

Question 9

Which of the following statements is not true of enteroinvasive

Accepted Answer

A)  Blood and pus are found in the stool.
B)  High fever is present.
C)  It makes no heat-labile or heat-stable exotoxins.
D)  Prompt treatment with a broad-spectrum antibiotic is essential to recover from an infection.
E)  It invades the gut mucosa.F) All of the above
G) B) and C)

Question 10

Vibrio cholerae can be readily isolated and identified in the laboratory from stool samples by

Accepted Answer

A)  dark-field microscopy looking for motility.
B)  its ability to grow at high temperature and produce zones of clearing on blood agar.
C)  its robust chemotactic response to the presence of chitin.
D)  growth on selective media followed by PCR of its 16S rRNA gene.E) A) and B)
F) A) and D)

Question 11

Escherichia coli infections

Accepted Answer

A)  are often transmitted by fecal contaminated water and food.
B)  include EIEC that destroys gut mucosa.
C)  involve enterotoxin in traveler's diarrhea.
D)  are self-limiting with the only treatment being rehydration.
E)  All of the choices are correct.F) C) and D)
G) B) and E)

Question 12

Mumps causes permanent sterility in young male adults.

Accepted Answer

A) True 
 B)False

Question 13

It is now past the normal dinner time, but you do not even want to think about food.Only diarrhea, abdominal cramps, and vomiting are on your mind.This all started a few hours ago after having a ham sandwich for lunch purchased from a street vendor.With your microbiology knowledge, you surmise that it is a Staphylococcus aureus-related disorder.Why do you think this?

Accepted Answer

A)  Staphylococcus aureus is the most common cause of gastrointestinal disease.
B)   The toxin produced by Staphylococcus aureus was already in the ham, so the symptoms can occur quickly.
C)   Ham is notorious for being contaminated with Staphylococcus aureus bacteria.
D)   Only Staphylococcus aureus infection causes vomiting, along with cramps and diarrhea.E) A) and C)
F) All of the above

Question 14

Which of the following is not a virulence factor associated with helminths?

Accepted Answer

A)  Degradative enzymes to damage host tissue
B)  Specialized structures for attachment to host tissues
C)  Secretion of toxins
D)  Thick cuticle to escape detection from the host immune systemE) B) and D)
F) All of the above

Question 15

A common food intoxication is caused by enterotoxin-producing strains of ______.

Accepted Answer

A)  Streptococcus pyogenes
B)  Staphylococcus saprophyticus
C)  Streptococcus agalactiae
D)  Staphylococcus aureus
E)  Staphylococcus epidermidisF) A) and B)
G) B) and E)

Question 16

Which of the following statements regarding fecal transplant is correct?

Accepted Answer

A)  Donors and recipients must be carefully matched to prevent an immune reaction in the recipient.
B)  The goal is to completely eradicate Clostridium difficile from a patient's gut microbiota and replace it with a healthy community.
C)  Fecal matter must be carefully disinfected and screened for viruses, cysts, and endospores before transfer to a recipient patient.
D)  This treatment is designed to jump-start the intestinal microbiota after an infection with Clostridium difficile resuts in acute diarrhea.E) B) and C)
F) A) and B)

Question 17

GALT refers to

Accepted Answer

A)  defenses of the GI tract: Gut microbes, Adenoids, Lysozyme, Tonsils.
B)  Gut-Associated Lymphoid Tissue.
C)  Gingival Adhesive Labile Toxin, a virulence factor for gingivitis.
D)  sterile organs of the GI tract: Gingiva, Appendix, Large intestine, Tonsils.E) None of the above
F) A) and B)

Question 18

Identify the mismatch in the following list of helminths and their common names.

Accepted Answer

A)  Schistosoma mansoni; blood fluke
B)  Ascaris lumbricoides; intestinal roundworm
C)  Opisthorchis sinensis; liver fluke
D)  Trichuris trichiura; whipworm
E)  Taenia solium; pinwormF) None of the above
G) All of the above

Question 19

From the surface to the interior of a tooth, the tissues in order are

Accepted Answer

A)  enamel, pulp, and dentin.
B)  pulp, dentin, and enamel.
C)  dentin, pulp, and enamel.
D)  enamel, dentin, and pulp.
E)  dentin, enamel, and pulp.F) B) and E)
G) A) and B)

Question 20

Enteropathogenic E.coli (EPEC) causes gut effacement with shiga toxin.

Accepted Answer

A) True 
 B)False

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Which of the following statements is not true of enteroinvasive

Correct Answer
verified

Vibrio cholerae can be readily isolated and identified in the laboratory from stool samples by

Correct Answer
verified

The primary viral cause of chronic diarrhea globally is ______.

Correct Answer
verified

Enteropathogenic E.coli (EPEC) causes gut effacement with shiga toxin.

Correct Answer
verified

Escherichia coli infections

Correct Answer
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Which of the following is not a virulence factor associated with helminths?

Correct Answer
verified

Which of the following statements is not true regarding Clostridium difficile?

Correct Answer
verified

In the absence of dietary carbohydrates, bacteria do not cause tooth decay.

Correct Answer
verified

There are vaccines for immunity to the Hepatitis B virus.

Correct Answer
verified

A common food intoxication is caused by enterotoxin-producing strains of ______.

Correct Answer
verified

Your son has not had the MMR vaccine (measles, mumps, rubella) because you are apprehensive about vaccines and their side effects.Your sister says that you are setting him up for a potentially damaging scenario.Which argument has the great scientific validity and why?

Correct Answer
verified

Which of the following statements regarding fecal transplant is correct?

Correct Answer
verified

Paramyxoviruses evade the host immune system by

Correct Answer
verified

Correct Answer
verified

All of the following diseases can be transmitted by drinking contaminated water except ______.

Correct Answer
verified

Identify the mismatch in the following list of helminths and their common names.

Correct Answer
verified

GALT refers to

Correct Answer
verified

From the surface to the interior of a tooth, the tissues in order are

Correct Answer
verified

Correct Answer
verified

Mumps causes permanent sterility in young male adults.

Correct Answer
verified

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Which of the following statements is not true of enteroinvasive

Correct AnswerverifiedShow Answer

Vibrio cholerae can be readily isolated and identified in the laboratory from stool samples by

Correct AnswerverifiedShow Answer

The primary viral cause of chronic diarrhea globally is ______.

Correct AnswerverifiedShow Answer

Enteropathogenic E.coli (EPEC) causes gut effacement with shiga toxin.

Correct AnswerverifiedShow Answer

Escherichia coli infections

Correct AnswerverifiedShow Answer

Which of the following is not a virulence factor associated with helminths?

Correct AnswerverifiedShow Answer

Which of the following statements is not true regarding Clostridium difficile?

Correct AnswerverifiedShow Answer

In the absence of dietary carbohydrates, bacteria do not cause tooth decay.

Correct AnswerverifiedShow Answer

There are vaccines for immunity to the Hepatitis B virus.

Correct AnswerverifiedShow Answer

A common food intoxication is caused by enterotoxin-producing strains of ______.

Correct AnswerverifiedShow Answer

Your son has not had the MMR vaccine (measles, mumps, rubella) because you are apprehensive about vaccines and their side effects.Your sister says that you are setting him up for a potentially damaging scenario.Which argument has the great scientific validity and why?

Correct AnswerverifiedShow Answer

Which of the following statements regarding fecal transplant is correct?

Correct AnswerverifiedShow Answer

Paramyxoviruses evade the host immune system by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All of the following diseases can be transmitted by drinking contaminated water except ______.

Correct AnswerverifiedShow Answer

Identify the mismatch in the following list of helminths and their common names.

Correct AnswerverifiedShow Answer

GALT refers to

Correct AnswerverifiedShow Answer

From the surface to the interior of a tooth, the tissues in order are

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Mumps causes permanent sterility in young male adults.

Correct AnswerverifiedShow Answer

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