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Comparative evaluation of minocycline susceptibility testing methods in carbapenem-resistant Acinetobacter baumannii
Authors
P. Dimitriadis Protonotariou, E. Varlamis, S. Poulou, A. Vasilaki, O. Metallidis, S. Tsakris, A. Malisiovas, N. Skoura, L. Pournaras, S.
Publication date
1 January 2016
Publisher
Abstract
In this study, the performance of two commonly used routine antimicrobial susceptibility testing methods, the automated VITEK®2 system and Etest (bioMérieux, Marcy-l'Étoile, France), was compared with the standard broth microdilution (BMD) method on 87 multidrug- and carbapenem-resistant Acinetobacter baumannii clinical isolates. Clinical and Laboratory Standards Institute (CLSI) 2015 breakpoints (susceptible, ≤4 mg/L; intermediate, 8 mg/L; and resistant, ≥16 mg/L) were used. Minocycline showed excellent activity, with 94.3% of isolates susceptible by BMD (VITEK®2, 73.6%; Etest, 63.2%). The MIC50/90 values (minimum inhibitory concentrations required to inhibit 50% and 90% of the isolates, respectively) were as follows: BMD, 1/4 mg/L; VITEK®2, ≤1/8 mg/L; and Etest, 4/16 mg/L. Etest produced 14.9% major/20.7% minor errors and VITEK®2 produced 3.4% major/17.2% minor errors. These data indicate that VITEK®2 may be more reliable than Etest for routine susceptibility testing of minocycline for A. baumannii isolates. As both VITEK®2 and Etest produced higher minocycline MICs compared with the reference method, BMD may be needed to validate the categorisation of carbapenem-resistant A. baumannii by these assays as minocycline non-susceptible. © 2016 Elsevier B.V. and International Society of Chemotherap
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Last time updated on 10/02/2023