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Metagenomic Next-Generation Sequencing of Cerebrospinal Fluid for the Detection of Central Nervous System Pathogens
Published on: April 17, 2026
Cerebrospinal Fluid Infection Caused by Mixta calida in a Patient With Sarcoma: Case Report With Whole-Genome
Yuting Xue1, Jiajing Wu1, Yufeng Sun1
1Department of Medical Laboratory, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China.
Abstract:
Mixta calida is a rare environmental Erwiniaceae organism with limited evidence of invasive human infection. We report cerebrospinal fluid infection in a 6-year-old girl with recurrent CIC-rearranged central nervous system sarcoma after neurosurgery, chemotherapy, stem-cell transplantation, and Ommaya reservoir access. Turbid cerebrospinal fluid showed severe neutrophilic inflammation and Gram-negative bacilli with leukocyte phagocytosis. Pure culture yielded an isolate identified by MALDI-TOF mass spectrometry. Four genomic 16S rRNA sequences showed 99.93% identity to the M. calida type strain, and whole-genome ANI was 99.59%. These findings support M. calida as a clinically significant opportunistic pathogen in immunocompromised patients.
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