Diffusion-mediated quantification of dose-dependent antifungal drug tolerance
Rasouli Koohi, S.; Charlebois, D. A.
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Antimicrobial resistance is a global health problem, with drug-resistant fungi posing major challenges for the treatment of immunocompromised patients. Antifungal tolerance is a recently discovered phenomenon whereby pathogenic fungi, including the multidrug-resistant pathogenic yeast Candidozyma (Candida) auris, grow slowly above minimum inhibitory drug concentrations. We combine physics-based spatiotemporal models with microbiology experiments to quantitatively investigate the emergence of tolerance to all three major classes of antifungal drugs in C. auris. Specifically, we use a finite element computational model based on Ficks second law to simulate drug diffusion and experimental disk diffusion assays to determine the concentrations at which antifungal-tolerant C. auris colonies emerge. Our study advances antimicrobial resistance research by providing a method to quantify antifungal tolerance and demonstrating that tolerance is a dose-dependent phenomenon in a multidrug-resistant fungal pathogen.
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