M124-1

Throat: group A streptococcus (bacitracin resistant)  – Shipped February 2013

HISTORY

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

  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.
  2. More sensitive and rapid methods of identification should be used for S. pyogenes.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques