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Questions and Answers
What is a distinguishing characteristic of Staphylococcus saprophyticus compared to Staphylococcus epidermidis?
What is a distinguishing characteristic of Staphylococcus saprophyticus compared to Staphylococcus epidermidis?
- Coagulase positive
- Novobiocin resistant (correct)
- Urease negative
- Ferments mannitol
Which property would you not find in both Staphylococcus epidermidis and Staphylococcus saprophyticus?
Which property would you not find in both Staphylococcus epidermidis and Staphylococcus saprophyticus?
- Coagulase-negative
- Urease-positive
- Ferments mannitol (correct)
- Catalase-positive
Which organism is most commonly associated with infections of prosthetic devices and IV catheters?
Which organism is most commonly associated with infections of prosthetic devices and IV catheters?
- E. coli
- Staphylococcus saprophyticus
- Staphylococcus aureus
- Staphylococcus epidermidis (correct)
Which of the following would incorrectly identify a sample as Staphylococcus saprophyticus?
Which of the following would incorrectly identify a sample as Staphylococcus saprophyticus?
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Where is Staphylococcus saprophyticus most commonly found as a normal microbiota?
Where is Staphylococcus saprophyticus most commonly found as a normal microbiota?
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Study Notes
Staphylococcus epidermidis
- Gram-positive, catalase-positive, coagulase-negative, urease-positive cocci that form clusters
- Sensitive to novobiocin
- Does not ferment mannitol, unlike Staphylococcus aureus which can ferment it
- Normal microbiota of skin, can contaminate blood cultures
- Infects prosthetic devices (e.g. hip implant, heart valve) and IV catheters by producing adherent biofilms
Staphylococcus saprophyticus
- Gram-positive, catalase-positive, coagulase-negative, urease-positive cocci that form clusters
- Resistant to novobiocin
- Normal microbiota of female genital tract and perineum
- Second most common cause of uncomplicated UTI in young females, after E coli
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