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Journal of Antimicrobial Chemotherapy (1999) 43, 477-481
© 1999 The British Society for Antimicrobial Chemotherapy

A comparative evaluation of Etest and broth microdilution methods for fluconazole and itraconazole susceptibility testing of Candida spp.

Estrella Martín-Mazuelosa,*, María Jesús Gutiérreza, Ana Isabel Allera, Samuel Bernala, María Angeles Martíneza, Olga Monteroa and Guillermo Quindósb

a Servicio de Microbiología Clínica, Hospital Universitario de Valme, Carretera de Cádiz s/n, E-41014 Sevilla; Spain b Departamento de Inmunología, Microbiología y Parasitología, Facultad de Medicina y Odontología, Universidad del País Vasco, Bilbao, Spain

The Etest strip is a promising tool of broad application in clinical microbiology. The method provides MIC readings and is easier to perform than broth microdilution. We carried out a study to compare the MICs of fluconazole and itraconazole obtained by the Etest with those obtained by broth microdilution, performed according to the guidelines of the NCCLS document M27-A, with 402 clinical isolates (360 Candida albicans, 17 Candida tropicalis, nine Candida krusei, nine Candida glabrata and seven Candida parapsilosis) and seven control isolates. The agreement between MICs by the two methods (at 6{mp} 2 dilutions) was 74.5% for fluconazole and 61.4% for itraconazole. These results suggest that further development is necessary to standardize the medium and incubation conditions before introduction of the Etest as a routine method in the clinical microbiology laboratory for fluconazole and itraconazole susceptibility testing.

* Corresponding author. Tel: +34-95-4596352; Fax +34-95-4596395.


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