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Related Experiment Videos

Susceptibility testing of Cryptococcus neoformans: a microdilution technique.

M A Ghannoum1, A S Ibrahim, Y Fu

  • 1Department of Medicine, Harbor-UCLA Medical Center, Torrance 90509.

Journal of Clinical Microbiology
|November 11, 1992
PubMed
Summary

This study optimized a microtiter method for antifungal susceptibility testing of Cryptococcus neoformans. The best conditions involve yeast nitrogen base medium, a 48-hour incubation, and an initial inoculum of 10^4 cells/mL for accurate results.

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Area of Science:

  • Mycology
  • Antimicrobial Susceptibility Testing
  • Clinical Microbiology

Background:

  • Accurate susceptibility testing of Cryptococcus neoformans is crucial for effective antifungal therapy.
  • Standardized methods are needed to ensure reproducible minimum inhibitory concentration (MIC) determination.
  • Previous studies have identified variability in testing conditions impacting results.

Purpose of the Study:

  • To define optimal test conditions for Cryptococcus neoformans antifungal susceptibility testing using a microtiter system.
  • To evaluate the impact of different media, incubation times, and inoculum sizes on MIC values.
  • To establish a simple, accurate, and reproducible method for routine testing.

Main Methods:

  • Twenty-one Cryptococcus neoformans isolates were tested.

Related Experiment Videos

  • Four chemically defined media (YNB 7, RPMI 1640, SAAMF, YNB 5.4) were evaluated.
  • Incubation periods of 24 and 48 hours, and inoculum sizes ranging from 10^3 to 10^5 cells/mL were assessed.
  • MICs for fluconazole, amphotericin B, and flucytosine were determined.

    • Main Results:

    • Optimal growth and reproducibility were achieved with a 48-hour incubation period.
    • An initial inoculum of 10^4 cells/mL was found to be optimal across tested media.
    • Yeast nitrogen base (BYNB 7) medium yielded reproducible MICs, while SAAMF resulted in higher MICs.
    • Amphotericin B showed low MIC variance, unlike fluconazole and flucytosine.

    Conclusions:

    • A microtiter system using BYNB 7, 48-hour incubation, and 10^4 cells/mL inoculum provides a simple, accurate, and reproducible method for C. neoformans susceptibility testing.
    • This optimized method is suitable for determining susceptibility to fluconazole, amphotericin B, and flucytosine.
    • Standardization of these parameters is essential for reliable antifungal susceptibility data.