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M203-3

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Stool: Shigella sonnei – Shipped November 02, 2020

HISTORY

A simulated stool sample collected from a 10 year old boy on farm with diarrhea was sent to category A laboratories. Participants were expected to isolate, identify, and perform susceptibility testing of Shigella sonnei.

MAIN EDUCATIONAL POINTS from M203-3

  1. It is important not to confuse a Shigella species (especially S. sonnei) with E. coli since they are very closely related and some identification systems can mis-interpret the test results if the isolate is only subjected to an automated test system.
  2. Antimicrobial treatment is usually necessary for most Shigella infections since this pathogen invades the lamina propria of the intestinal tract, and fever is common.

Full critique (PDF)

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