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Background Isavuconazole (ISZ), dosed as the pre-drug isavuconazonium (ISM), is active against a wide variety of clinically important fungal pathogens. ISM is approved for the treatment of invasive aspergillosis and mucormycosis in adults ≥18 years of age. We present our experience with ISM to treat proven or to prevent fungal infection in pediatric patients. Methods In a retrospective review of patients who received ISM at our institution between April 2016 and April 2019, we abstracted demographic information, primary diagnosis, indication for ISM therapy, ISZ serum concentrations if available, and outcomes. Results Of 16 patients who received ISM, 12 were  1 week of verified inpatient dosing, ranging from 1.0 to 7.5 mg/L, above the MIC in all cases when known. Five (42%) patients died of underlying non-mycological causes, 1 (8%) died of progressive scedosporiosis, and 6 (50%) improved. The two patients receiving ISM prophylaxis did not suffer a breakthrough fungal infection. ISM was well tolerated with no dose-limiting, drug-related toxicities noted. Conclusion ISM is a well-tolerated therapeutic option in pediatric patients at risk for or with invasive mycosis. Only 1 of our 12 patients died from progressive fungal disease. Disclosures All authors: No reported disclosures.

2122. Isavuconazonium for Invasive Fungal Therapy: Single-Center Pediatric Experience