Ch. 9 Infection

Question 1

Which of the following is NOT a stage of pathologic infection?
  Colonization
  Invasion
  Death 
  Spread

Answer 1

Death

Question 2

Which of the following terms describes an agent’s ability to produce disease?
  Virulence
  Pathogenicity
  Infectivity
  Immunogenicity

Answer 2

Pathogenicity

Question 3

A person is exposed to group A beta-hemolytic Streptococcus, a bacterium. Which of the following statements regarding the immune system and its response is TRUE?
C3b is effective in adhering bacteria to the phagocytic receptor.
C5b-C9 kills viruses.
Antibodies phagocytose microorganisms.
Natural killer cells attack bacteria.

Answer 3

C3b is effective in adhering bacteria to the phagocytic receptor

Question 4

Which of the following is NOT a mechanism of antigenic variation?
  Siderophoric switching 
  Mutation
  Recombination
  Gene switching

Answer 4

Siderophoric switching

Question 5

Which of the following is a TRUE statement regarding bacteremia?
It occurs with a normal defense system of the body.
It is always caused by gram-positive bacteria.
Endotoxins often cause symptoms such as vasodilation.
Symptoms include increased blood pressure.

Answer 5

Endotoxins often cause symptoms such as vasodilation

Question 6

A person presents with a virus. Which of the following statements regarding viruses is TRUE?
Viruses are less common than bacterial infections.
Viruses actively produce exotoxins.
Viruses bypass many defense mechanisms by developing intracellularly.
Viruses contain all their genetic information in RNA.

Answer 6

Viruses bypass many defense mechanisms by developing intracellularly

Question 7

A person presents with a bacterial infection and a temperature of 40º C (104º F). Which of the following statements regarding fever is TRUE?
Fever is a failure of the body to regulate temperature.
An endogenous pyrogen may produce fever.
The body’s central thermostat is the pituitary gland.
Fever is a failure of the body’s defense system.

Answer 7

An endogenous pyrogen may produce fever

Question 8

Which of the following is NOT a mechanism used by viruses to evade the immune response?
  Rapid division
  Intracellular survival
  Self-protein coat
  Lipopolysaccharide

Answer 8

Lipopolysaccharide

Question 9

Which of the following contributes to antibiotic-resistant pathogens?
  Inadequate sanitation
  Genetic mutation
  Loss of multidrug transporters
  Limited use of antibiotics

Answer 9

Genetic mutation