Gram – Joint Fluid: 1-5/oif (2+) neutrophils, 2-10/oif (2+) gram negative diplococci and gram positive bacilli (Moraxella catarrhalis and Bacillus circulans). – Shipped August 10, 2020
A simulated joint fluid sample from a 55 year old male, with prosthetic knee collected from the OR was sent to category A and C1 laboratories for Gram staining.
MAIN EDUCATIONAL POINTS from G202
- The presence of more than one species and of the morphotypes observed is more suggestive of contamination during the surgical procedure rather than true infection in this clinical setting
- The observation of a probable Bacillus species and gram negative diplococci in this clinical operating room situation generally points to contamination. However, in a prosthetic joint which may be destroyed by infection, it is important to report the microorganisms observed, so that the clinician can make a judgement based on the pathophysiology of the joint they are operating on.