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Disk diffusion testing using Candida sp. colonies taken directly from CHROMagar Candida medium may decrease time

Michael Klevay1, Alex Ebinger, Daniel Diekema

  • 1Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.

Journal of Clinical Microbiology
|July 8, 2005
PubMed
Summary
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Disk diffusion antifungal susceptibility testing for Candida sp. is accurate using CHROMagar. This method, following CLSI M44-A guidelines, allows reliable results for fluconazole and voriconazole.

Area of Science:

  • Clinical Microbiology
  • Mycology
  • Antimicrobial Susceptibility Testing

Background:

  • Accurate antifungal susceptibility testing (AST) is crucial for guiding treatment of Candida infections.
  • Standardized methods are needed to ensure reliable AST results.
  • CHROMagar is a selective medium used for Candida identification.

Purpose of the Study:

  • To compare the accuracy of disk diffusion antifungal susceptibility testing for Candida sp. when using inocula from CHROMagar versus potato dextrose agar.
  • To evaluate the performance of the CLSI M44-A disk diffusion method with CHROMagar-derived inocula.

Main Methods:

  • Candida sp. strains were passaged on CHROMagar and potato dextrose agar.
  • Disk diffusion antifungal susceptibility testing was performed for fluconazole and voriconazole.

Related Experiment Videos

  • Results were compared based on categorical agreement and error rates.

    • Main Results:

    • High overall categorical agreements were observed for fluconazole (95%) and voriconazole (98%).
    • Very major error rates were low: 0% for fluconazole and 0.5% for voriconazole.
    • Disk diffusion testing using inocula directly from CHROMagar demonstrated accurate results.

    Conclusions:

    • Disk diffusion antifungal susceptibility testing for Candida sp. can be reliably performed using inocula taken directly from CHROMagar.
    • The CLSI M44-A method is accurate when applied with CHROMagar, providing a viable alternative for AST.