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Updated: Jul 19, 2026

Broth Microdilution In Vitro Screening: An Easy and Fast Method to Detect New Antifungal Compounds
Published on: February 14, 2018
[Methods for in vitro antifungal susceptibility testing]
1Centre National de Référence Mycologie et Antifongiques, Institut Pasteur, Paris, France. dannaoui@pasteur.fr
Abstract:
During the last years, a large amount of work has been completed to improve the methods used for in vitro antifungal susceptibility testing. Reference techniques are currently available both for yeasts and filamentous fungi, but in some instances, technical improvement are needed. Etest is another well standardized method that can be used as an alternative on a routine basis in the clinical microbiology laboratory. Studies of in vitro-in vivo correlations have led to the definition of susceptibility breakpoints for yeasts for fluconazole, itraconazole, and flucytosine.
Insights
Standardized methods for in vitro antifungal susceptibility testing are available for yeasts and filamentous fungi. Further improvements are needed, but Etest offers a reliable alternative for clinical microbiology labs.
Area of Science:
- Mycology
- Microbiology
- Pharmacology
Context:
- Significant advancements in in vitro antifungal susceptibility testing methods have been achieved.
- Established reference techniques exist for both yeasts and filamentous fungi.
- Ongoing efforts focus on refining existing methods and exploring alternatives.
Purpose:
- To review the current state of in vitro antifungal susceptibility testing methods.
- To highlight the availability and standardization of reference techniques.
- To discuss the utility of Etest as a routine clinical microbiology tool.
- To report on the establishment of susceptibility breakpoints for key antifungal agents.
Summary:
- Reference methods for in vitro antifungal susceptibility testing are available for yeasts and filamentous fungi, though technical improvements are still required.
- The Etest method is a standardized and viable alternative for routine use in clinical microbiology laboratories.
- In vitro-in vivo correlation studies have successfully defined susceptibility breakpoints for fluconazole, itraconazole, and flucytosine in yeasts.
Impact:
- Provides an overview of current antifungal susceptibility testing methodologies.
- Facilitates informed selection of appropriate antifungal agents in clinical settings.
- Supports accurate diagnosis and treatment of fungal infections.
- Contributes to the standardization of antifungal drug efficacy assessment.
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