Update on diagnosis and treatment of fungal meningitis: lessons from recent outbreaks.

PURPOSE OF REVIEW: Recently, fungal meningitis outbreaks have occurred in association with neuraxial and epidural anesthesia in immunocompetent patients. Herein, we describe the course of those outbreaks, their diagnosis, treatment, prognosis, and lessons learned.

RECENT FINDINGS: Two outbreaks of Fusarium solani meningitis during 2022-2023 were associated with epidural anesthesia in two distant cities in Mexico (Durango and Matamoros). The initial etiological agent identification was delayed due to insensitivity of cultures. A Fusarium solani qPCR was validated and positive in 38% cerebrospinal fluid (CSF) samples from Durango, while BD-Glucan allowed early diagnosis of the index case in Matamoros. Antifungal treatment with voriconazole and liposomal amphotericin B (L-AmB) was recommended. Overall mortality was 51%. Once the cause was confirmed, some patients received fosmanogepix.

SUMMARY: Fungal meningitis outbreaks due to filamentous fungi are usually associated with direct epidural inoculation. They result in severe presentations and high mortality. Early diagnosis should be suspected, BD-Glucan CSF testing screening is recommended. Aggressive antifungal treatment based on antifungal susceptibility testing should be administered as early as possible. The advent of molecular diagnostic methods and new antifungal drugs may allow for timely diagnosis and treatment, increasing the chances of survival.