M144-2

Sputum: Haemophilus influenzae   – Shipped February 2015

HISTORY

A simulated sputum specimen collected from a 67 year old male patient, smoker, was sent to category A and B laboratories.

Participants were expected to isolate and report Haemophilus influenzae. It was also expected the laboratories would perform a β-lactamase test on the isolate.

MAIN EDUCATIONAL POINTS from M144-2

  1. H. influenzae is the most common bacterial cause of exacerbations of Chronic Obstructive Pulmonary Disease (COPD).
  2. A positive β-lactamase test reliably indicates ampicillin/amoxicillin resistance in H. influenzae and further testing of sputum isolates is generally not required.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques