M132-2

Stool:  Escherichia coli O157  – Shipped August 2013

HISTORY

The sample was a simulated stool obtained from a 50 year old male with watery diarrhea.

Participants were expected to isolate and identify Escherichia coli serotype O157.

MAIN EDUCATIONAL POINTS from M132-2

  1. Some strains of enterohemorrhagic E. coli O157 and non O157 may not be detected if using Sorbitol MacConkey (SMAC) agar.
  2. Chromogenic agars have been developed which allow for detection of sorbitol and non-sorbitol fermenting isolates.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques