G122

Gram – Eye: gram negative diplococci and neutrophils – Shipped August 2012

HISTORY

The challenge was sent to category A, B, C, and C1 laboratories. The sample was a simulated eye swab obtained from a 3 year old patient with conjunctivitis.

Participants were expected to report the presence of neutrophils and gram negative diplococcic.

MAIN EDUCATIONAL POINTS from G122

  1. The presence of gram-negative diplococci on Gram stain of a conjunctival sample is suggestive of Neisseria or Moraxella species.
  2. Correctly identifying the predominant WBC type in the sample assists in identifying the most likely cause of conjunctivitis as neutrophils are suggestive of bacterial infection vs. lymphocytes which are suggestive of viral infection.

 

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques, Gram