M202-3

Wound: Staphylococcus aureus, Streptococcus pyogenes – Shipped August 10, 2020

HISTORY

A simulated wound sample collected from a 4 year old male with impetigo was sent to category A laboratories.

MAIN EDUCATIONAL POINTS from M202-3

  1. In mixed cultures, especially with organisms all showing hemolysis, one must be careful not to assume that the growth is all one organism. Attention needs to be given to the colony morphologies present to properly differentiate haemolytic Staphylococcus and Streptococcus.
  2. Staphylococcus aureus skin infections are usually associated with the production of pus, while Streptococcus pyogenes skin infections lack purulence.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques