Diagnostic Strategies for Tuberculous Meningitis

Tuberculous meningitis is a life-threatening form of extrapulmonary tuberculosis that demands prompt identification and treatment to prevent severe neurological damage. Diagnosis rests on integration of clinical assessment, cerebrospinal fluid analysis and microbiological or molecular tests. Key clinical features include persistent headache, fever, neck stiffness and altered consciousness. Examination of cerebrospinal fluid typically reveals a lymphocytic pleocytosis, elevated protein and low glucose. Conventional microbiological methods—Ziehl–Neelsen smear microscopy and mycobacterial culture—remain reference standards but suffer from low sensitivity and lengthy turnaround times. Nucleic acid amplification tests, in particular automated molecular assays, have markedly improved rapid detection of Mycobacterium tuberculosis DNA in cerebrospinal fluid. Recent developments include metagenomic sequencing for unbiased pathogen detection and host-response biomarkers that may distinguish tuberculous meningitis from other meningeal infections. Imaging modalities such as magnetic resonance can support diagnosis by demonstrating basal meningeal enhancement and hydrocephalus. Machine learning approaches applied to multimodal data hold promise for refined case definitions and triage. Globally, adoption of rapid molecular diagnostics and standardised case definitions has reduced diagnostic delay, yet barriers persist in resource-limited settings. Ongoing work focuses on improving sensitivity of point-of-care tests, minimising sample volume requirements and validating host-directed assays to guide early therapy and improve outcomes.

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Diagnostic Strategies for Tuberculous Meningitis publication trend

The graph below shows the total number of articles in diagnostic strategies for tuberculous meningitis across all publications each year (not limited to Nature Index journals).

Technical terms

Cerebrospinal fluid (CSF): Clear fluid surrounding the brain and spinal cord, analysed to detect infection markers.

Ziehl–Neelsen smear microscopy: A staining technique to visualise acid-fast bacilli under a microscope.

Mycobacterial culture: Growth of Mycobacterium tuberculosis on specialised media, considered the gold-standard microbiological test.

Nucleic acid amplification test (NAAT): Molecular assays that detect pathogen DNA or RNA rapidly, enhancing early diagnosis.

Metagenomic next-generation sequencing (mNGS): High-throughput sequencing of all genetic material in a sample to identify pathogens without specific primers.

Sensitivity and specificity: Measures of a test’s ability to correctly identify those with and without disease, respectively.

References

1. A systematic review and meta-analysis of the diagnostic accuracy of metagenomic next-generation sequencing for diagnosing tuberculous meningitis. Frontiers in Immunology (2023).
2. The diagnosis of tuberculous meningitis: advancements in new technologies and machine learning algorithms. Frontiers in Microbiology (2023).
3. Diagnostic accuracy of Xpert MTB/RIF Ultra for tuberculous meningitis in HIV-infected adults: a prospective cohort study. The Lancet Infectious Diseases (2017).