Treatment considerations for recurrent MRSA bacteremia leading to cholecystitis.

We present an end-stage renal disease patient with acute cholecystitis caused by a recurrence of methicillin-resistant Staphylococcus aureus (MRSA) bacteremia. Timely antibiotic therapy with vancomycin did not eradicate the patient's infection. In this patient, the minimum inhibitory concentration (MIC) of the organism for vancomycin was at the upper limit of susceptibility. The ability to thoroughly understand and interpret mean inhibitory concentrations is crucial in antibiotic selection. For high-risk patients with Staphylococcus aureus infection with reduced susceptibility to vancomycin as demonstrated by an MIC of 2 mg/L or greater, we suggest further investigation into linezolid as an alternative antibiotic to vancomycin therapy. Compared to vancomycin, linezolid has similar effectiveness in patients with MRSA bacteremia as well as improved penetration, particularly in bile.