M133-1

Midstream urine:  ≥100 x 10^6 cfu/L  Aerococcus urinae  – Shipped November 2013

HISTORY

A sample simulating a midstream urine obtained from a symptomatic 85 year old male in a nursing home, was sent to category A, B, and C laboratories.

Participants were expected to isolate, report colony count, and identify Aerococcus urinae; antibiotic susceptibilities were not required.

MAIN EDUCATIONAL POINTS from M133-1

  1. Identification and reporting of Aerococcus species from urine culture is of particular importance due to the potential for serious complications (i.e. infective endocarditis, septicemia, etc.)
  2. Due to shared macroscopic morphology, a Gram stain is essential to distinguish aerococci from viridans group streptococci before discounting growth as being of non- or minor significance.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques