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Article Abstract
The classic definition of antimicrobial susceptibility to antifungal drugs ignores the persistence of subpopulations that survive in the presence of a drug. Even in entirely clonal populations, small subpopulations of yeast can grow in the presence of a drug, sometimes up to extremely high drug concentrations, such that they may be clinically relevant. Identifying and quantifying the incidence with which these subpopulations arise is an essential step in understanding how pathogenic yeast, such as Candida species (i.e., C. albicans, C. glabrata, C. auris, C. tropicalis, C. parapsilosis, and others) as well as Cryptococcus species, behave in response to antifungal therapeutics. Here we describe simple in vitro protocols for the quantification of drug responses with subpopulation resolution.
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