Chapter 23 Flashcards
Which of the following is a fungus that commonly lives in the large intestine?
Candida
The bacterium ________ adheres to and grows on teeth, contributing to dental plaque formation
Streptococcus mutans
Porphyromonas gingivalis contributes to the development of
periodontitis
Most peptic ulcers are the result of colonization of the stomach by
Helicobacter pylori
Urease is an important virulence factor of which of the following?
Helicobacter pylori
The virulence factor of Vibrio cholera, which is primarily responsible for the signs and symptoms of
cholera, is
its ability to produce a potent exotoxin.
The major symptoms of cholera are attributable to which of the following?
activation of adenylate cyclase
Infection with some Salmonella enterica serotypes can progress to typhoid fever when the bacteria
enter the blood and are engulfed by phagocytes
Which of the following produce the type III secretion system virulence factor?
E. coli O157:H7, Shigella and Salmonella
Escherichia coli O157:H7 is primarily associated with which of the following foods?
ground beef
The most common cause of traveler’s diarrhea is
Escherichia coli.
Shigellosis can be differentiated from salmonellosis by the fact that Shigella
multiplies in the host cell’s cytosol.
The most common bacterial cause of diarrhea that sends people to doctors in the United States is
Campylobacter
A young woman being treated for serious burns develops severe diarrhea accompanied by intense
abdominal pain. She passes several watery, foul-smelling, bloody stools a day. A colonoscopy reveals
patches of yellowish lesions in the large intestine. The probable causative agent is
Clostridium difficile
Staphylococcal food poisoning is called an intoxication disorder because
toxins produced by the bacteria growing in the food are ingested along with the food.
Which of the following statements is TRUE with regard to oral herpes?
Lesions can be triggered by emotional stress or physiologic changes
Which of the following is the major sign or symptom of mumps?
parotitis
The viruses responsible for the majority of infant deaths resulting from diarrhea in the world are the
rotaviruses
Chronic infection with ________ may progress to hepatic cancer
both HBV and HCV
The intracellular parasite usually acquired in contaminated drinking water that causes a persistent watery diarrhea is
Cryptosporidium parvum
Which of the following conditions usually results in severe acute liver damage?
co-infection with hepatitis B and hepatitis delta viruses
The primary treatment for viral gastroenteritis is
rehydration therapy
Of the following, who is most likely to develop a chronic infection with hepatitis B virus?
newborns
A man reports to his doctor that he is tired all the time and his urine has become darker in color. He has
not experienced fever or vomiting recently. The physician notes that his eyes are yellowish and his abdomen
is swollen and tender. The man has a history of kidney transplant. The man may be infected with
hepatitis C virus
