M212-5

Blood: Clostridium tertium – Shipped August 09, 2021

HISTORY

A simulated blood culture sample collected from a 53-year old surgical patient was sent to category A laboratories. Participants were expected to identify and report Clostridium tertium.

MAIN EDUCATIONAL POINTS from M212-5

  1. Aerotoloerant clostridia can be distinguished from Bacillus based on catalase, growth pattern, and demonstration of spores under aerobic vs. anaerobic growth conditions.
  2. Complete identification as well as antimicrobial susceptibility testing should always be performed on anaerobic isolates from normally sterile body sites. Referral to another laboratory should be done when the testing laboratory does not have these capabilities.

Full critique (PDF)

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