Step I First Aid Urease Positive bugs and test

[Ronin786]

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So in the FA errata they say to add Staphylococcus saprophyticus and Staphylococcus epidermis to the list of Urease Positive bugs on page 150.

However, later on on page 198, when listing the Urease Positive UTI bugs, the Errata specifically says to add Staphylococcus (having listed saprophyticus as a UTI bug) to the list of Urease Negative bugs.

Is it possible that S. saprophyticus doesn't show up as urease positive, or is this another one of the many issues?

 

[petitedocteur]

i dont think staph.saprophyticus is urease +ve.
the urease +ve bugs are easy to remember - by knowing the urease PUNCH (Proteus, Ureaplasma, Nocardia, Cryptoccocus, and H.Pylori)

 

[Phloston]

I've encountered S. saprophyticus in practice questions as being urease-positive.

Via all of the practice questions I've done so far, I've come up with "BacK PPUNCHeS"

Bacteroides
Klebsiella
Proteus
Providencia
Ureaplasma
Nocardia
Cryptococcus
H. pylori
S. saprophyticus

The clinical relevance of S. saprophyticus being urease-positive is that, like Proteus, it can also cause staghorn calculi.

I also cannot recall 100% which source I had encountered Providencia, but it's known to grow on catheters / IV lines, with greater prevalence in nursing homes. So if S. epidermidis isn't an answer and Providencia is, go with it.

Edit: I just remembered: Zaslau's Board Buster is where I had seen Providencia (but I wouldn't recommend the text as a whole).

 

[alternatego]

I've encountered S. saprophyticus in practice questions as being urease-positive.

Via all of the practice questions I've done so far, I've come up with "BacK PPUNCHeS"

Bacteroides
Klebsiella
Proteus
Providencia
Ureaplasma
Nocardia
Cryptococcus
H. pylori
S. saprophyticus

The clinical relevance of S. saprophyticus being urease-positive is that, like Proteus, it can also cause staghorn calculi.

I also cannot recall 100% which source I had encountered Providencia, but it's known to grow on catheters / IV lines, with greater prevalence in nursing homes. So if S. epidermidis isn't an answer and Providencia is, go with it.

Edit: I just remembered: Zaslau's Board Buster is where I had seen Providencia (but I wouldn't recommend the text as a whole).

I'm DEFINITELY annotating this into my FA tomorrow morning