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ECB-ART-53885
Emerg Infect Dis 2025 May 03;315:948-957. doi: 10.3201/eid3105.241657.
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Metagenomic Identification of Fusarium solani Strain as Cause of US Fungal Meningitis Outbreak Associated with Surgical Procedures in Mexico, 2023.

Chiu CY , Servellita V , de Lorenzi-Tognon M , Benoit P , Sumimoto N , Foresythe A , Cerqueira FM , Williams-Bouyer N , Ren P , Herrera LNS , Gaston DC , Sayyad L , Whitmer SL , Klena J , Vikram HR , Gold JAW , Gade L , Parnell L , Misas E , Chiller TM , Griffin IS , Basavaraju SV , Smith DJ , Litvintseva AP , Chow NA .


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We used metagenomic next-generation sequencing (mNGS) to investigate an outbreak of Fusarium solani meningitis in US patients who had surgical procedures under spinal anesthesia in Matamoros, Mexico, during 2023. Using a novel method called metaMELT (metagenomic multiple extended locus typing), we performed phylogenetic analysis of concatenated mNGS reads from 4 patients (P1-P4) in parallel with reads from 28 fungal reference genomes. Fungal strains from the 4 patients were most closely related to each other and to 2 cultured isolates from P1 and an additional case (P5), suggesting that all cases arose from a point source exposure. Our findings support epidemiologic data implicating a contaminated drug or device used for epidural anesthesia as the likely cause of the outbreak. In addition, our findings show that the benefits of mNGS extend beyond diagnosis of infections to public health outbreak investigation.

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