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Candida species are the predominant fungal pathogens in humans and an important cause of mortality in immunocompromised patients. We developed a model of candidiasis in Toll (Tl)-deficient Drosophila melanogaster. Similar to the situation in humans, C. parapsilosis was less virulent than C. albicans when injected into Tl mutant flies. In agreement with findings in the mouse model of invasive candidiasis, cph1/cph1 and efg1/efg1 C. albicans mutants had attenuated virulence, and the efg1/efg1 cph1/cph1 double mutant was almost avirulent in Tl mutant flies. Furthermore, the conditional tet-NRG1 C. albicans strain displayed significantly attenuated virulence in flies fed food without doxycycline; virulence was restored to wild-type levels when the strain was injected into Tl mutant flies fed doxycycline-containing food. Fluconazole (FLC) mixed into food significantly protected Tl mutant flies injected with FLC-susceptible C. albicans strains, but FLC had no activity in flies injected with FLC-resistant C. krusei strains. The D. melanogaster model is a promising minihost model for large-scale studies of virulence mechanisms and antifungal drug activity in candidiasis.

Drosophila melanogasteras a Facile Model for Large‐Scale Studies of Virulence Mechanisms and Antifungal Drug Efficacy inCandidaSpecies