16 Questions
Which of the following is a key difference between staphylococci and streptococci?
Staphylococci produce catalase, while streptococci do not.
What distinguishes S. aureus from S. epidermidis and S. saprophyticus?
Coagulase production
Which of the following is a characteristic of S. aureus?
Ferments mannitol
Which genus of bacteria produces a yellow pigment called staphyloxanthin?
Staphylococcus
What distinguishes S. epidermidis and S. saprophyticus from S. aureus?
Production of catalase
What is the role of coagulase in the pathogenicity of S. aureus?
Causes plasma to clot
Where is S. aureus commonly found as normal flora?
Nasopharyngeal cavity
Which species is part of the normal vaginal flora and predominantly implicated in genitourinary tract infections in sexually active young women?
S. saprophyticus
Which species can cause severe endogenous infections in immunosuppressed patients and those with central venous catheters?
S. epidermidis
Which species is resistant to novobiocin?
S. saprophyticus
Which species ferments mannitol?
S. aureus
Which Staphylococcus species is predominantly associated with UTIs in sexually active young women?
S. saprophyticus
Which species is commonly found as part of the normal flora of human skin?
S. aureus
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?
S. epidermidis
Which species survives for long periods on dry surfaces?
S. aureus
Which Staphylococcus species is predominantly implicated in genitourinary tract infections in sexually active young women?
S.saprophyticus
Test your knowledge on gram-positive cocci, focusing on the medically important genera: Staphylococcus and Streptococcus. Learn about their distinguishing characteristics and key differences.
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