The 60 Percent Diagnostic Gap in M/E - Summary - MDSpire

The 60 Percent Diagnostic Gap in M/E

  • By

  • Jessica Allerton

  • March 12, 2026

  • 6 min

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Objective:

To explore the challenges in diagnosing meningitis/encephalitis (M/E) and the potential of metagenomic next-generation sequencing (mNGS) to improve diagnostic outcomes, addressing the significant diagnostic gap.

Approach:
    Key Findings:
    • Over 60% of M/E cases remain undiagnosed despite extensive testing, highlighting the need for improved diagnostic methods.
    • Earlier use of mNGS could reduce microbiologic testing by over 60% in infectious cases and by more than 90% in autoimmune encephalitis, demonstrating its efficiency.
    • Time to diagnosis could be shortened by approximately 7 days for infectious cases and 10 days for autoimmune encephalitis, significantly impacting patient management.
    Interpretation:

    mNGS can significantly streamline the diagnostic process for M/E, particularly in complex cases, by providing rapid and comprehensive pathogen detection, which is crucial for timely treatment.

    Limitations:
    • mNGS does not replace initial diagnostic tests and requires careful interpretation, particularly regarding false positives.
    • Contamination control is crucial due to the assay's high sensitivity, necessitating strict laboratory protocols.
    Conclusion:

    Integrating mNGS earlier in the diagnostic pathway for M/E may enhance patient management, reduce unnecessary testing, and improve antimicrobial stewardship, ultimately leading to better patient outcomes.

    Sources:

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