Heart valve swab: Methicillin Resistant Staphylococcus aureus (MRSA)  – Shipped 02 November 2015


A simulated OR heart valve swab collected from 28 year old IV drug user was sent to category A laboratories.

Participants were expected to isolate and identify MRSA. Participants were also expected to perform susceptibility testing and report isolate to infection control (IC)/public health (PH).


  1. Infective endocarditis can be a complication of injection drug use, particularly with gram positive organisms such as MRSA.
  2. Appropriate labelling of the isolate as MRSA and correct reporting to Infection Control or Public Health is important to prevent the transmission of MRSA.
  3. The antimicrobial cornerstone of native-valve MRSA infective endocarditis treatment is vancomycin in susceptible isolates, and timely, accurate susceptibility testing is critical for effective patient management.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques Tagged with: