Multicenter study of anidulafungin and micafungin MIC distributions and epidemiological cutoff values for eight candida species and the CLSI M27-A3 broth microdilution method

M. A. Pfaller, A. Espinel-Ingroff, B. Bustamante, E. Canton, D. J. Diekema, A. Fothergill, J. Fuller, G. M. Gonzalez, J. Guarro, C. Lass-Flörl, S. R. Lockhart, E. Martin-Mazuelos, J. F. Meis, L. Ostrosky-Zeichner, T. Pelaez, G. St-Germain, J. Turnidge

Resultado de la investigación: Articlerevisión exhaustiva

37 Citas (Scopus)

Resumen

Since epidemiological cutoff values (ECVs) using CLSI MICs from multiple laboratories are not available for Candida spp. and the echinocandins, we established ECVs for anidulafungin and micafungin on the basis of wild-type (WT) MIC distributions (for organisms in a species-drug combination with no detectable acquired resistance mechanisms) for 8,210 Candida albicans, 3,102 C. glabrata, 3,976 C. parapsilosis, 2,042 C. tropicalis, 617 C. krusei, 258 C. lusitaniae, 234 C. guilliermondii, and 131 C. dubliniensis isolates. CLSI broth microdilution MIC data gathered from 15 different laboratories in Canada, Europe, Mexico, Peru, and the United States were aggregated to statistically define ECVs. ECVs encompassing 97.5% of the statistically modeled population for anidulafungin and micafungin were, respectively, 0.12 and 0.03 μg/ml for C. albicans, 0.12 and 0.03 μg/ml for C. glabrata, 8 and 4 μg/ml for C. parapsilosis, 0.12 and 0.06 μg/ml for C. tropicalis, 0.25 and 0.25 g/ml for C. krusei, 1 and 0.5 μg/ml for C. lusitaniae, 8 and 2 μg/ml for C. guilliermondii, and 0.12 and 0.12 μg/ml for C. dubliniensis. Previously reported single and multicenter ECVs defined in the present study were quite similar or within 1 2-fold dilution of each other. For a collection of 230 WT isolates (no fks mutations) and 51 isolates with fks mutations, the species-specific ECVs for anidulafungin and micafungin correctly classified 47 (92.2%) and 51 (100%) of the fks mutants, respectively, as non-WT strains. These ECVs may aid in detecting non-WT isolates with reduced susceptibility to anidulafungin and micafungin due to fks mutations.

Idioma originalEnglish (US)
Páginas (desde-hasta)916-922
Número de páginas7
PublicaciónAntimicrobial agents and chemotherapy
Volumen58
N.º2
DOI
EstadoPublished - feb. 2014

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases

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