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Improved method for azole antifungal susceptibility testing.

M A Gordon1, E W Lapa, P G Passero

  • 1Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany 12201.

Journal of Clinical Microbiology
|September 1, 1988
PubMed
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This study presents a reproducible method for determining antifungal Minimum Inhibitory Concentrations (MICs) for yeasts and molds. The novel semisolid medium ensures sharp endpoints and simplifies antifungal susceptibility testing.

Area of Science:

  • Mycology
  • Antimicrobial Susceptibility Testing
  • Pharmaceutical Sciences

Background:

  • Accurate determination of Minimum Inhibitory Concentrations (MICs) is crucial for effective antifungal therapy.
  • Existing methods for antifungal susceptibility testing can lack reproducibility and clear endpoints, especially for diverse fungal pathogens.
  • Standardization of antifungal MIC testing is needed for reliable clinical and research applications.

Purpose of the Study:

  • To describe a reproducible method for determining the MICs of common azole antifungals against yeasts and molds.
  • To establish sharp, reliable endpoints for antifungal susceptibility testing using a novel semisolid medium.
  • To provide a user-friendly and stable medium for routine laboratory use.

Main Methods:

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  • Development and validation of a semisolid agar medium with controlled pH.
  • Utilization of a standardized inoculum for consistent test performance.
  • Emphasis on the critical timing for reading results to ensure sharp endpoints.

    • Main Results:

    • The described method yields reproducible MIC values for ketoconazole, miconazole, fluconazole, and itraconazole.
    • Sharp endpoints are consistently achieved for both yeast and mold species.
    • The semisolid medium demonstrates ease of preparation and a long shelf life.

    Conclusions:

    • A reproducible and reliable method for antifungal MIC determination has been established.
    • The novel semisolid medium facilitates accurate susceptibility testing of yeasts and molds.
    • This method offers a practical solution for laboratories performing antifungal susceptibility testing.