Stool: Escherichia coli O157 – Shipped August 2013
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
- Some strains of enterohemorrhagic E. coli O157 and non O157 may not be detected if using Sorbitol MacConkey (SMAC) agar.
- Chromogenic agars have been developed which allow for detection of sorbitol and non-sorbitol fermenting isolates.