M111-1

Midstream Urine: Staphylococcus saprophyticus – Shipped May 2011

HISTORY

The challenge was sent to category A, B, and C laboratories. The sample was a simulated midstream urine obtained from a 19 year old female with dysuria.

Participants were expected to isolate, report colony count, and identify Staphylococcus saprophyticus.

MAIN EDUCATIONAL POINTS from M111-1

  1. Laboratory identification of S. saprophyticus is made on the basis of resistance to novobiocin, the absence of hemolysin and coagulase, and intense glossy, butyrous and convex colonies. S. saprophyticus is intrinsically resistant to novobiocin.

Full critique (PDF)

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