GS184-1

Gram – Joint Fluid: 4+ (>10/oif) neutrophils; 3+ (11-50/oif) gram negative bacilli (Acinetobacter species) – Shipped February 11, 2019

HISTORY

A simulated joint fluid sample collected from a 72 year old male, knee replacement, post-op infection was sent to category A, C, and C1 laboratories.

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

 

MAIN EDUCATIONAL POINTS from GS184-1

  1. While the majority of prosthetic joint infections result from gram positive infections, gram negative infections are not uncommon, and must be on the differential.
  2. Acinetobacter may be difficult to de-stain, may pair or clump and are pleomorphic gram negative coccobacilli; care must be taken not to mistaken it for Neisseria species or gram positive organisms such as Staphylococcus or Streptococcus.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques, Gram