M214-2

Tissue biopsy: Proteus mirabilis  – Shipped February 07, 2022

HISTORY

A simulated tissue biopsy collected from a 79 year old quadriplegic, long-term care resident, with bed sore ulcer was sent to category A laboratories. Participants were expected to report Proteus mirabilis and test susceptibility to the following agents ampicillin or amoxicillin, amoxicillin/clavulanate, cefazolin, third generation cephalosporins, gentamicin, piperacillin-tazobactam, ciprofloxacin, and trimethoprim-sulfamethoxazole.

MAIN EDUCATIONAL POINTS from M214-2

  1. Although superficial swabs of ulcers are often not helpful, biopsies can provide useful information.
  2. Proteus mirabilis may be susceptible to ampicillin, while being intermediate or resistant to cefazolin. The results of testing these agents should be reported as they appear.

Full critique (PDF)

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