Throat: group A streptococcus (bacitracin resistant) – Shipped February 2013
The challenge was sent to category A, B, and C laboratories. The sample was a simulated throat swab obtained from a 5 year old male with pharyngitis.
Laboratories were expected to isolate, identify, and report group A streptococcus.
MAIN EDUCATIONAL POINTS from M124-1
- Although they occur infrequently bacitracin resistant S. pyogenes are significant. Therefore, bacitracin susceptibility tests cannot be used as the sole means to identify S. pyogenes.
- More sensitive and rapid methods of identification should be used for S. pyogenes.