The incidence of invasive fungal infections has risen significantly in recent decades as medical interventions have become increasingly aggressive. These infections are extremely difficult to treat due to the extremely limited repertoire of systemic antifungals, the development of drug resistance, and the extent of to which the patient's immune function is compromised. Even when the appropriate antifungal therapies are administered in a timely fashion, treatment failure is common, frequently even in the absence of in vitro microbial resistance. In this study, we screened a small collection of FDA approved oncolytic agents for compounds that impact the efficacy of the two most widely used classes of system antifungals against Candida albicans, Candida glabrata, and Aspergillus fumigatus. We have identified several drugs that enhance fungal growth in the presence of the azole antifungals and examine the potential that these drugs directly affect fungal fitness, specifically antifungal susceptibility, and may be contributing to clinical treatment failure.
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