Gram-Positive Cocci: Staphylococcus vs Streptococcus
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Questions and Answers

Which of the following is a key difference between staphylococci and streptococci?

  • Staphylococci produce catalase, while streptococci do not. (correct)
  • Staphylococci form spores, while streptococci do not.
  • Staphylococci are motile, while streptococci are nonmotile.
  • Staphylococci form grapelike clusters, while streptococci form chains.

What distinguishes S. aureus from S. epidermidis and S. saprophyticus?

  • Mannitol fermentation
  • Production of yellow pigment
  • Ability to form spores
  • Coagulase production (correct)

Which of the following is a characteristic of S. aureus?

  • Produces catalase
  • Forms chains
  • Produces coagulase
  • Ferments mannitol (correct)

Which genus of bacteria produces a yellow pigment called staphyloxanthin?

<p>Staphylococcus (B)</p> Signup and view all the answers

What distinguishes S. epidermidis and S. saprophyticus from S. aureus?

<p>Production of catalase (A)</p> Signup and view all the answers

What is the role of coagulase in the pathogenicity of S. aureus?

<p>Causes plasma to clot (C)</p> Signup and view all the answers

Where is S. aureus commonly found as normal flora?

<p>Nasopharyngeal cavity (B)</p> Signup and view all the answers

Which species is part of the normal vaginal flora and predominantly implicated in genitourinary tract infections in sexually active young women?

<p>S. saprophyticus (B)</p> Signup and view all the answers

Which species can cause severe endogenous infections in immunosuppressed patients and those with central venous catheters?

<p>S. epidermidis (A)</p> Signup and view all the answers

Which species is resistant to novobiocin?

<p>S. saprophyticus (B)</p> Signup and view all the answers

Which species ferments mannitol?

<p>S. aureus (A)</p> Signup and view all the answers

Which Staphylococcus species is predominantly associated with UTIs in sexually active young women?

<p>S. saprophyticus (B)</p> Signup and view all the answers

Which species is commonly found as part of the normal flora of human skin?

<p>S. aureus (D)</p> Signup and view all the answers

Which species is a commensal of the skin but can cause severe endogenous infections in immunosuppressed patients and those with central venous catheters and Foley catheters?

<p>S. epidermidis (D)</p> Signup and view all the answers

Which species survives for long periods on dry surfaces?

<p>S. aureus (A)</p> Signup and view all the answers

Which Staphylococcus species is predominantly implicated in genitourinary tract infections in sexually active young women?

<p>S.saprophyticus (A)</p> Signup and view all the answers

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