Bacterial Virulence Factors Quiz
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Questions and Answers

Which type of hemolysis is associated with Group B Streptococcus?

  • Beta-hemolysis
  • Gamma-hemolysis
  • Delta-hemolysis
  • Alpha-hemolysis (correct)

    • What is the estimated number of invasive cases of Group A Streptococcus pyogenes infections with a mortality rate of 25%?

  • Over 650,000 cases (correct)
  • Over 500,000 cases
  • Over 600,000 cases
  • Over 750,000 cases

    • Which virulence factor allows Group A Streptococcus to destroy red blood cells and harvest iron from them?

  • Staphylococcal alpha toxin
  • Exfoliative toxin
  • Streptolysin S
  • Streptolysin O (correct)

    • What differentiates S.pyogenes from S.aureus in terms of hemolysin production?

    <p>Production of Streptolysin O</p> Signup and view all the answers

    What is the function of exfoliative toxin produced by S. aureus?

    <p>Causes the upper layers of skin to slough off</p> Signup and view all the answers

    Which enzyme allows S. aureus to penetrate deeper into the body by breaking down connective tissue integrity?

    <p>Hyaluronidase</p> Signup and view all the answers

    What is the role of coagulase or staphylokinase produced by S. aureus?

    <p>Clots blood and may hide bacteria from phagocytes</p> Signup and view all the answers

    Which virulence factor allows S. aureus to resist β-lactam antibiotics?

    <p>Protein A</p> Signup and view all the answers

    What is the most common way for bacteria to enter the skin and cause cellulitis?

    <p>Via open wounds such as blisters and bites</p> Signup and view all the answers

    Which bacteria are responsible for approximately 2/3rds of cellulitis cases?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

    What is the analogy used to describe the effect of cellulitis on the skin?

    <p>A bacterial burn</p> Signup and view all the answers

    What is a common risk factor for recurrent cellulitis according to the text?

    <p>Presence of skin abnormalities such as trauma or fungal infection</p> Signup and view all the answers

    What is the function of streptokinases in Streptococcus pyogenes?

    <p>Dissolving blood clots</p> Signup and view all the answers

    Which virulence factor of Streptococcus pyogenes allows for the spread of the bacteria through tissues?

    <p>Hyaluronidase</p> Signup and view all the answers

    How do exotoxin A and C produced by S. pyogenes exert their pyrogenic properties?

    <p>Acting directly on the hypothalamus</p> Signup and view all the answers

    What is the function of C5a peptidase in Streptococcus pyogenes?

    <p>Destroying C5a compliment protein</p> Signup and view all the answers

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