Question 1

Which is not a characteristic of Helicobacter pylori?

Accepted Answer

A)  Produces urease to buffer stomach acidity
B)  Curved rods
C)  Lives in the stomach
D)  Produces enteroxin that causes diarrhea
E)  Gram-negativeF) A) and D)
G) B) and C)

Question 2

The only body fluid that can transmit Hepatitis B virus is blood.

Accepted Answer

A) True 
 B)False

Question 3

Outbreaks of which protozoan disease have been associated with fecal-contaminated imported raspberries, fresh greens, and drinking water?

Accepted Answer

A)  Toxoplasmosis
B)  Cyclosporiasis
C)  Trichinosis
D)  CryptosporidiosisE) A) and C)
F) A) and D)

Question 4

Which of the following is not true of enterotoxigenic

Accepted Answer

A)  It causes traveler's diarrhea.
B)  It can be life-threatening in infants.
C)  It causes a high fever.
D)  Fluid replacement is vital to surviving an infection.
E)  coli (ETE
C)  ?F) C) and D)
G) None of the above

Question 5

Gingivitis

Accepted Answer

A)  involves the formation of calculus and plaque.
B)  is primarily caused by normal anaerobic biota.
C)  involves a crevice in the gum along the tooth.
D)  may involve archaeal species.
E)  All of the choices are correct.F) A) and B)
G) C) and D)

Question 6

A current news story describes a cruise ship in the Carribbean with an outbreak of diarrheal illness, affecting hundreds of people.With all of those people in a small area, opening and closing doors, using handrails, etc, you are trying to figure out what infectious agent may be the cause.Your most likely guess is that the pathogen is ______.

Accepted Answer

A)  Clostridium difficile
B)  hepatitis B
C)   norovirus
D)   cholera
E)  coliF) C) and D)
G) None of the above

Question 7

Which of the following antigen types found in gram-negative enterics is mismatched?

Accepted Answer

A)  H antigen - flagellar
B)  K antigen - capsule
C)  O antigen - cell wall
D)  All of the choices are correct matches.E) B) and D)
F) A) and D)

Question 8

Hepatitis B infection

Accepted Answer

A)  has an incubation of 2 to 3 weeks.
B)  increases risk for hepatocellular cancer.
C)  can be transmitted by the fecal-oral route.
D)  is responsible for most cases of post-transfusion hepatitis.E) B) and D)
F) A) and D)

Question 9

The fact that Salmonella has a high ID50 means that

Accepted Answer

A)  it is more pathogenic than 50% of all gut microbes.
B)  an antibiotic dose of 50 g/ml can be expected to kill the organism.
C)  consuming just a few cells of Salmonella will not result in illness.
D)  the most stringent decontamination measures must be used in food preparation facilities.E) A) and B)
F) A) and C)

Question 10

Which of the following statements regarding Clostridium difficile infection is incorrect?

Accepted Answer

A)  It is a colitis that is a superinfection.
B)  It is associated with disruption of normal biota due to broad-spectrum antimicrobials.
C)  It is due to ingestion of contaminated, improperly stored, cooked meats and gravies.
D)  It is the major cause of diarrhea in hospitals.E) B) and C)
F) A) and D)

Question 11

The most dangerous outcome of a Taenia solium infection occurs when

Accepted Answer

A)  cysticerci are ingested.
B)  larvae enter the body through intact skin.
C)  the host immune system fails to react against it.
D)  eggs are ingested.
E)  larvae cross the placenta.F) A) and E)
G) B) and E)

Question 12

Which of the following attributes is not common to the life and transmission cycles of Opisthorchis sinensis, Clonorchis sinensis, and Fasciola hepatica?

Accepted Answer

A)  Infection causes obstruction of the bile duct.
B)  Eggs are released in the feces.
C)  They are transmitted by consuming inadequately cooked fish.
D)  Fresh water snails are an intermediate host.E) All of the above
F) B) and C)

Question 13

Which of the following statements is incorrect about hepatitis A?

Accepted Answer

A)  It is transmitted by the oral-fecal route.
B)  Havrix is an inactivated vaccine for prevention.
C)  An infection predisposes a person for liver cancer.
D)  Immune globulin therapy helps decrease the severity.
E)  The virus produces flu-like symptoms with discomfort near the liver and darkened urine.F) B) and E)
G) All of the above

Question 14

There are no infectious agents that can penetrate intact skin.

Accepted Answer

A) True 
 B)False

Question 15

Shiga toxin-producing

Accepted Answer

A)  has a reservoir inside of cattle intestines.
B)  causes a bloody diarrhea.
C)   in some cases, leads to the development of hemolytic uremic syndrome (HUS)  with possible kidney failure
D)  is transmitted by ingestion of contaminated, undercooked food, especially hamburger.
E)  coli characteristics include all of the following except that itF) None of the above
G) C) and D)

Question 16

The most common bacterial cause of diarrhea in the United States is ______.

Accepted Answer

A)  Campylobacter
B)  Salmonella
C)   E.coli
D)  ShigellaE) B) and D)
F) A) and C)

Question 17

Hepatitis B virus

Accepted Answer

A)  is principally transmitted by blood.
B)  transmission risks include shared needles, anal intercourse, and heterosexual intercourse.
C)  is transmitted to newborns from chronic carrier mothers.
D)  has many chronic carriers.
E)  All of the choices are correct.F) A) and B)
G) None of the above

Question 18

Which of the following groups of microorganisms is not found among the normal gut microbiota?

Accepted Answer

A)  Firmicutes (Streptococcus, Staphylococcus, Clostridium, Bacillus) 
B)  Protozoa (Entamoeba, Trichomonas) 
C)  Enterics (Escherichia, Enterobacter) 
D)  Spirilla (Leptospira, Borrelia) 
E)  Fungi (Candida) F) A) and D)
G) D) and E)

Question 19

A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea.Which of the following would be a good practice to isolate this organism?

Accepted Answer

A)  Incubate the isolation medium adjacent to a bright full-spectrum light.
B)  Incubate the isolation medium at about 90°C.
C)  Use an anaerobic medium and incubate in a sealed container.
D)  Adjust the pH of the medium to below 5.E) B) and D)
F) B) and C)

Question 20

The virulence of Vibrio cholerae is due to its ______.

Accepted Answer

A)  neurotoxin
B)  invasive enzymes
C)  enterotoxin
D)  capsuleE) B) and C)
F) A) and C)

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Outbreaks of which protozoan disease have been associated with fecal-contaminated imported raspberries, fresh greens, and drinking water?

Correct Answer
verified

Which of the following statements regarding Clostridium difficile infection is incorrect?

Correct Answer
verified

The most common bacterial cause of diarrhea in the United States is ______.

Correct Answer
verified

Shiga toxin-producing

Correct Answer
verified

Hepatitis B infection

Correct Answer
verified

The only body fluid that can transmit Hepatitis B virus is blood.

Correct Answer
verified

Which of the following attributes is not common to the life and transmission cycles of Opisthorchis sinensis, Clonorchis sinensis, and Fasciola hepatica?

Correct Answer
verified

Gingivitis

Correct Answer
verified

Which is not a characteristic of Helicobacter pylori?

Correct Answer
verified

The virulence of Vibrio cholerae is due to its ______.

Correct Answer
verified

Which of the following is not true of enterotoxigenic

Correct Answer
verified

The fact that Salmonella has a high ID₅₀ means that

Correct Answer
verified

Which of the following antigen types found in gram-negative enterics is mismatched?

Correct Answer
verified

The most dangerous outcome of a Taenia solium infection occurs when

Correct Answer
verified

Hepatitis B virus

Correct Answer
verified

There are no infectious agents that can penetrate intact skin.

Correct Answer
verified

Which of the following groups of microorganisms is not found among the normal gut microbiota?

Correct Answer
verified

A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea.Which of the following would be a good practice to isolate this organism?

Correct Answer
verified

Correct Answer
verified

Which of the following statements is incorrect about hepatitis A?

Correct Answer
verified

Exam 22: Infectious Diseases Affecting the Gastrointestinal Tract

Outbreaks of which protozoan disease have been associated with fecal-contaminated imported raspberries, fresh greens, and drinking water?

Correct AnswerverifiedShow Answer

Which of the following statements regarding Clostridium difficile infection is incorrect?

Correct AnswerverifiedShow Answer

The most common bacterial cause of diarrhea in the United States is ______.

Correct AnswerverifiedShow Answer

Shiga toxin-producing

Correct AnswerverifiedShow Answer

Hepatitis B infection

Correct AnswerverifiedShow Answer

The only body fluid that can transmit Hepatitis B virus is blood.

Correct AnswerverifiedShow Answer

Which of the following attributes is not common to the life and transmission cycles of Opisthorchis sinensis, Clonorchis sinensis, and Fasciola hepatica?

Correct AnswerverifiedShow Answer

Gingivitis

Correct AnswerverifiedShow Answer

Which is not a characteristic of Helicobacter pylori?

Correct AnswerverifiedShow Answer

The virulence of Vibrio cholerae is due to its ______.

Correct AnswerverifiedShow Answer

Which of the following is not true of enterotoxigenic

Correct AnswerverifiedShow Answer

The fact that Salmonella has a high ID50 means that

Correct AnswerverifiedShow Answer

Which of the following antigen types found in gram-negative enterics is mismatched?

Correct AnswerverifiedShow Answer

The most dangerous outcome of a Taenia solium infection occurs when

Correct AnswerverifiedShow Answer

Hepatitis B virus

Correct AnswerverifiedShow Answer

There are no infectious agents that can penetrate intact skin.

Correct AnswerverifiedShow Answer

Which of the following groups of microorganisms is not found among the normal gut microbiota?

Correct AnswerverifiedShow Answer

A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea.Which of the following would be a good practice to isolate this organism?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements is incorrect about hepatitis A?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The fact that Salmonella has a high ID₅₀ means that

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified