M124-5

Foot ulcer: group B streptococcus (non-hemolytic) – Shipped February 2013

HISTORY

The challenge was sent to category A laboratories. The sample was a simulated wound swab taken from a 60 year old diabetic man with a foot ulcer.

Laboratories were expected to isolate, identify, and report group B streptococcus.

MAIN EDUCATIONAL POINTS from M124-5

  1. The presence or absence of beta-hemolysis approach to identification may make it difficult to correctly identify non-hemolytic strains of streptococcal species that are usually supposed to be beta-hemolytic.
  2. Non-hemolytic strains are as equally virulent as the beta hemolytic strains.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques