[A comparative study between broth dilution and agar dilution technics in antibiograms for Candida]

Area of Science:

• Clinical Microbiology
• Mycology
• Pharmacology

Background:

• Accurate antifungal susceptibility testing is crucial for guiding therapy against Candida infections.
• Standardized methods like broth dilution and agar dilution are used to determine drug efficacy.
• Understanding the concordance between these methods is essential for reliable clinical interpretation.

Purpose of the Study:

• To compare the performance of broth dilution and agar dilution methods for antifungal susceptibility testing of Candida strains.
• To evaluate the concordance between minimal inhibitory concentration (MIC) and minimal fungicidal concentration (MFC) values obtained from both methods.
• To assess the drug-dependent variability in concordance for polyene and imidazole antifungal agents.

Main Methods:

• Candida strains were tested against polyene and imidazole antifungal agents using both broth dilution and agar dilution methods.
• Minimal Inhibitory Concentration (MIC) and Minimal Fungicidal Concentration (MFC) were determined for each drug and method combination.
• Concordance percentages between the two methods were calculated and analyzed.

Main Results:

• The concordance between broth dilution and agar dilution methods was found to be dependent on the specific antifungal drug tested.
• Higher concordance rates were observed when testing polyene antifungal agents compared to imidazole agents.
• Variability in MIC and MFC results highlights challenges in yeast antifungal sensitivity testing.

Conclusions:

• Both broth dilution and agar dilution methods can be employed for Candida antifungal susceptibility testing, but method choice impacts results.
• Polyene antifungals show better agreement between the two methods, suggesting greater reliability for these agents.
• Further investigation into optimizing yeast antifungal sensitivity testing protocols is warranted to address observed discrepancies.