Treatment Failure of Isavuconazole in a Patient with Cryptococcosis.

Isavuconazole is a broad-spectrum azole that is FDA-approved for the treatment of aspergillosis and mucormycosis; data on the use of isavuconazole for the treatment and prevention of other invasive fungal infections are limited. Here, we report a patient with pulmonary cryptococcosis treated with isavuconazole who experienced progression to disseminated infection with Cryptococcus while on isavuconazole. Caution is advised when using isavuconazole in situations where there is a paucity of data to recommend its use.