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J Clin Microbiol. 2012 Jul;50(7):2509-12. doi: 10.1128/JCM.00791-12. Epub 2012 Apr 25.

Comparison of dimethyl sulfoxide and water as solvents for echinocandin susceptibility testing by the EUCAST methodology.

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  • 1Mycology Department, Spanish National Center for Microbiology, Instituto de Salud Carlos III, Madrid, Spain.

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  • J Clin Microbiol. 2012 Sep;50(9):3149.


Ninety-six strains of Candida, including 29 resistant and 67 susceptible isolates with mutations in the FKS1 and FKS2 genes were tested by the European Committee on Antibiotic Susceptibility Testing EDef 7.1 and 7.2 methodologies to determine the impact on the MIC when water was replaced with dimethyl sulfoxide (DMSO) as the solvent for caspofungin and micafungin. The MICs were significantly lower and the MIC ranges were narrower when DMSO was used as the solvent. The use of DMSO may help to better discriminate between susceptible and resistant populations.

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