Tissue biopsy: Proteus mirabilis – Shipped February 07, 2022
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
- Although superficial swabs of ulcers are often not helpful, biopsies can provide useful information.
- 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.