Tracheal Wound swab: Serratia marcescens – Shipped May 10, 2021
A simulated wound sample collected from a 55 year old surgical/ICU patient with a tracheal site wound was sent to category A laboratories.
Participants were expected to identify Serratia marcescens and report its antimicrobial susceptibility.
MAIN EDUCATIONAL POINTS from M211-2
- Serratia marscecens is an important nosocomial pathogen, often acquired in the community but can spread in hospitals. Its accurate identification is important for prompt and effective treatment.
- Caution should be exercised in reporting antimicrobial susceptibilities for this micro-organism. The penicillin and first and second generations cephalosporins are intrinsically resistant, and evidence in the literature suggests that resistance – particularly to third-generation cephalosporins can develop while patients are on therapy. Repeat testing should be considered after several days of antimicrobial treatment.