M113-2

Joint fluid: Haemophilus influenzae b + gram negative bacillus (contaminant) – Shipped November 2011

HISTORY

A simulated joint fluid sample collected from a 3 year old female with an inflamed knee was sent to category A and B laboratories.

Participants were expected to isolate Haemophilus influenzae b, perform susceptibility testing or refer for testing. CMPT quality control revealed the presence of a contaminant gram negative bacillus.

MAIN EDUCATIONAL POINTS from M113-2

  1. It is important to process specimens in a timely fashion. Small amounts of contaminants can outgrow the actual pathogen in a sample making the interpretation of results very difficult or the actual pathogen may be missed altogether.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques