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JAC Advance Access originally published online on August 17, 2006
Journal of Antimicrobial Chemotherapy 2006 58(4):861-863; doi:10.1093/jac/dkl335
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© The Author 2006. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Comparative study of disc diffusion and microdilution methods in susceptibility testing of micafungin against Candida species

M. Ramírez1, M. C. Serrano1, C. Castro1, E. López1, C. Almeida2, A. Fernández2, A. Romero1 and E. Martín-Mazuelos1,*

1 Servicio de Microbiología Clínica, Hospital Universitario de Valme Seville 41014, Spain 2 Servicio de Bioestadística, Unidad Investigación, Hospital Universitario de Valme Seville, Spain

Received 19 May 2006; returned 4 July 2006; revised 18 July 2006; accepted 19 July 2006

*Corresponding author. Tel: +34-955015480; Fax: +34-955015481; E-mail: estrella.martin.sspa{at}juntadeandalucia.es

Objectives: To compare the Clinical Laboratory Standards Institute CLSI M44-A disc diffusion (DD) and M27-A2 broth microdilution (MD) methods for determining the susceptibility of Candida spp. to micafungin (FK463).

Patients and methods: A total of 355 clinical yeast isolates including 270 Candida albicans, 45 Candida glabrata, 24 Candida krusei, 11 Candida tropicalis and 5 Candida parapsilosis were studied. The MIC of micafungin was determined by following the CLSI M27-A2 guidelines (MD). Endpoints were defined as the lowest concentration of micafungin resulting in partial inhibition (IC50) of visual growth after 24/48 h of incubation at 35°C. Final concentrations were 0.008–4 mg/L of micafungin. DD testing was performed using a CLSI M44-A document with 2.5 µg micafungin discs. Zone diameter endpoints were read after 24/48 h of incubation at 35°C. Arbitrary breakpoints were 4 mg/L for MD and 15 mm for DD.

Results: The best correlation was observed when we read MD 48 h/DD 24 and 48 h (97%). When the reading was MD 24 h/DD 24 and 48 h the percentage of correlation was 95.2%.

Conclusions: The DD method performs well for testing the susceptibility of Candida spp. to micafungin. More studies involving more Candida strains with elevated MIC values are needed.

Keywords: susceptibility testing , antifungals , lipopeptides


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