Stool: No Salmonella, Shigella, Campylobacter, E. coli O157:H7, Yersinia, Aeromonas, Plesiomonas, Vibrio or Edwarsiella tarda (NSSCEYAPVE) isolated. – Shipped November 2012


The challenge was sent to category A and B laboratories. The sample was a simulated stool obtained from a 1 year old female patient with diarrhea. The patient had no history of travel.

Participants were expected to report no pathogens in the sample.


  1. This challenge represents stool that does not have any enteric pathogen present. This is the most common outcome for stool samples submitted for enteric culture as 80% will have no bacterial pathogen.
  2. The key educational point is that it is as important to be able to report that there are no enteric pathogens as it is to accurately identify any enteric pathogens present.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques