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Background Candida auris is a growing global threat; a pathogen associated with high mortality (up to 60%), multidrug resistance, the ability to spread from person-to-person and surface-to-person, presenting high risk for outbreaks in healthcare facilities. Ibrexafungerp is a novel IV/oral glucan synthase inhibitor (triterpenoid) antifungal with activity against Candida, Aspergillus, and Pneumocystis spp., in Phase 3 development. Methods In vitro studies tested ibrexafungerp against &gt;100 clinical isolates of C. auris. Other in vitro studies evaluated the effects of ibrexafungerp against C. auris biofilms. In vivo activity against C. auris was evaluated using a disseminated murine model and a cutaneous infection guinea pig model. In humans, an ongoing open-label trial of ibrexafungerp for treatment of patients with infections caused by C. auris (the CARES study) has been initiated in the United States and India. Results In vitro and in vivo studies demonstrated that ibrexafungerp is active against C. auris, including MDR strains. The MIC mode for ibrexafungerp was 1 μg/mL and the MIC50 and MIC90 were 0.5 and 1 μg/mL, respectively. Many echinocandin-resistant C. auris isolates have shown susceptibility to ibrexafungerp. Furthermore, ibrexafungerp has been shown to reduce biofilm thickness. In animal models of C. auris infection, treatment with ibrexafungerp resulted in improved survival and reduced fungal burden in both the murine model of disseminated infection and the guinea pig model of cutaneous infection as compared with untreated controls. In humans, two patients with difficult to treat C. auris candidemias were enrolled in the CARES study and responded positively to oral ibrexafungerp with eradication of the infection. Conclusion These data demonstrate that ibrexafungerp possess potent in vitro and in vivo activity as well as promising clinical activity. Therefore, continued clinical evaluation of ibrexafungerp as an option to treat C. auris infections is warranted. Disclosures All authors: No reported disclosures.

672. Activity of Ibrexafungerp (Formerly SCY-078) Against Candida auris: In vitro, In Vivo, and Clinical Case Studies of Candidemia