M112-2

 Sputum: Serratia liquefaciens – Shipped August 2011

HISTORY

A sample simulating a sputum sample obtained from a 62 year old female in-patient with COPD, cough and fever was sent to category A and B laboratories.

Participants were expected to isolate and identify Serratia liquefaciens. Laboratories were also expected to test and report susceptibility to quinolones, aminoglycosides, third generation cephalospor ins , and t r imethopr imsulfamethoxazole.

The committee expected that the labs would comment on the use of third generation cephalosporins in this kind of organisms (AmpC producer).

MAIN EDUCATIONAL POINTS from M112-2

  1. Serratia species are intrinsically resistant to ampicillin, amoxicillin, amoxicillin-clavulanic acid, first generation cephalosporins, cefuroxime, and colistin.

Full critique (PDF)

Posted in Clinical Bacteriology Results, critiques