Streptococcus Classification Quiz
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Questions and Answers

What is a characteristic of Streptococcus species that grow both at 45°C and 37°C but not at 10°C?

  • They may have A, C, G, or N antigen. (correct)
  • They are part of the Lancefield group.
  • They are β-hemolytic.
  • They are normal biota in the lower respiratory tract.

    • Which Streptococcus species is non-hemolytic with Lancefield N antigen and is found in dairy products?

  • S. lactis (correct)
  • S. mutans
  • S. salivarius
  • S. anginosus

    • How can Enterococci spp. be classified based on Smith & Brown's classification?

  • Based on their Lancefield group resistance.
  • Based on their growth temperature preferences.
  • Based on the color of the RBC around colonies. (correct)
  • Based on their ability to cause alpha-hemolysis.

    • Which Streptococcus species is associated with green streptococci and is part of the normal fecal flora?

    <p>S. bovis complex</p> Signup and view all the answers

    What distinguishes β-hemolytic Streptococcus species from other groups?

    <p>Growth preferences at specific temperatures.</p> Signup and view all the answers

    Why might some Streptococcus species be able to withstand temperatures above 60°C?

    <p>As part of their normal habitat in human intestine.</p> Signup and view all the answers

    Which virulence factor of Group A Streptococci is responsible for resisting phagocytosis and adherence to mucosal cells?

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

    Which adhesion molecule of Group A Streptococci mediates epithelial cell attachment?

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

    What is the function of the Hyaluronic Acid Capsule of Group A Streptococci?

    <p>Prevents opsonized phagocytosis by PMN or macrophages</p> Signup and view all the answers

    Which Streptococcus serotype is most common in causing pharyngitis?

    <p>M1</p> Signup and view all the answers

    How are Group A Streptococci mainly acquired?

    <p>Via contaminated droplets released through coughing and sneezing</p> Signup and view all the answers

    What is the main function of the M Protein in Group A Streptococci?

    <p>Resists complement activation</p> Signup and view all the answers

    What is the main function of streptokinase?

    <p>Causes lysis of fibrin clots</p> Signup and view all the answers

    Which hemolysin is oxygen stable and nonimmunogenic?

    <p>Streptolysin S (SLS)</p> Signup and view all the answers

    What inhibits Streptolysin O (SLO)?

    <p>Cholesterol in skin lipids</p> Signup and view all the answers

    What is the main function of Deoxyribonuclease (DNase)?

    <p>Lowers viscosity of exudates</p> Signup and view all the answers

    What type of hemolysis does Streptolysin S (SLS) cause?

    <p>Extracellular hemolysis</p> Signup and view all the answers

    What is the function of Streptodornase?

    <p>Lowers viscosity of exudates</p> Signup and view all the answers

    What is the function of Streptococcal Pyrogenic Exotoxins (SPEs)?

    <p>Acting as superantigens and activating macrophages</p> Signup and view all the answers

    Which bacterial toxin degrades protein and mediates rashes seen in scarlet fever?

    <p>Exotoxin B</p> Signup and view all the answers

    What is the role of C5a peptidase in bacterial infections?

    <p>Inactivating chemotactic factors for neutrophils</p> Signup and view all the answers

    How do Streptococcal Pyrogenic Exotoxins (SPEs) contribute to shock and organ failure?

    <p>By acting as superantigens</p> Signup and view all the answers

    What is the incubation period for bacterial pharyngitis or tonsillitis?

    <p>1 to 4 days</p> Signup and view all the answers

    Which type of streptococci grow as 'satellite colonies' around other bacteria?

    <p>Granulicatella and Abiotrophia</p> Signup and view all the answers

    What characteristic feature is shared by Streptococcus-like organisms Aerococcus, Gemella, Lactococcus, Leuconostoc, and Pediococcus?

    <p>Growth in 6.5% NaCl</p> Signup and view all the answers

    Which Streptococcus-like organism is associated with infections similar to enterococci and streptococci?

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

    Which Streptococcus-like organism does not produce acid from carbohydrates?

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

    Which Streptococcus-like organism resembles viridans streptococci on culture but microscopically is similar to staphylococci?

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

    Which Streptococcus-like organism is associated with infections such as sepsis, meningitis, bacteremia, and UTIs?

    <p>Globicatella sanguinis</p> Signup and view all the answers

    'Abiotrophia' and 'Granulicatella' are formerly known as what?

    <p>&quot;The Vitamin B6-dependent Streptococci&quot;</p> Signup and view all the answers

    Which Streptococcus-like organism is associated with wound infections?

    <p>Helcococcus kunzii</p> Signup and view all the answers

    'Aerococcus urinae' is associated with which of the following infections?

    <p>UTI, endocarditis, lymphadenitis, and peritonitis</p> Signup and view all the answers

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