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Updated: May 29, 2026

A Reference Broth Microdilution Method for Dalbavancin In Vitro Susceptibility Testing of Bacteria that Grow Aerobically
Published on: September 9, 2015
Relationships between vancomycin minimum inhibitory concentration, dosing strategies, and outcomes in
Evan C Clemens1, Jeannie D Chan, John B Lynch
1Department of Pharmacy, Harborview Medical Center and School of Pharmacy, University of Washington, Seattle, WA 98104, USA.
Abstract:
Retrospective study aimed to examine outcomes of methicillin-resistant Staphylococcus aureus (MRSA) bacteremia in relationship to vancomycin minimum inhibitory concentration (VAN MIC) and serum trough concentrations among subjects who had ≥1 blood culture positive for MRSA between April 2008 and August 2009. Treatment failure occurred in 7/24 (29%) subjects with VAN MIC = 2 mg/L versus 20/94 (21%) subjects with VAN MIC ≤1.5 mg/L (adjusted OR 1.11, 95% confidence interval [CI] 0.24-5.14). Among subjects who had documented VAN serum trough concentrations, treatment failure occurred in 5/26 (19%) subjects with concentrations <15 mg/L versus 18/68 (27%) subjects with concentrations ≥15 mg/L (adjusted OR 0.91, 95% CI 0.21-3.84). In conclusion, treatment outcomes were similar regardless of VAN MIC, although there was a non-statistically significant trend towards decreased clinical efficacy among patients with VAN MIC = 2 mg/L. Optimization of VAN pharmacokinetic indices did not appear to correlate with clinical responses.
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