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Progress toward Developing Sensitive Non-Sputum-Based Tuberculosis Diagnostic Tests: the Promise of Urine Cell-Free
Emily MacLean1,2, Ruvandhi R Nathavitharana3
1Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Canada.
Journal of Clinical Microbiology
|May 13, 2021
Summary
A new urine cell-free DNA (cfDNA) test accurately detects tuberculosis (TB) without sputum. This optimized test shows high sensitivity and specificity, meeting WHO performance criteria for TB diagnostics.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Diagnostics
Background:
- Accurate tuberculosis (TB) detection is crucial, with a need for non-sputum-based diagnostic tests.
- Current TB diagnostics face challenges, particularly in resource-limited settings and for specific patient groups.
Purpose of the Study:
- To evaluate the performance of an optimized urine cell-free DNA (cfDNA) test for detecting active pulmonary tuberculosis (TB).
- To assess the accuracy of this novel cfDNA assay against established diagnostic criteria.
Main Methods:
- A retrospective clinical study using frozen urine samples (n=73) from patients with active pulmonary TB in South Africa.
- Comparison of cfDNA test results with non-TB patients from South Africa and the United States.
- Utilized sequence-specific purification and short-target PCR for optimized cfDNA analysis.
Main Results:
- The urine cfDNA test demonstrated a sensitivity of 83.7% and a specificity of 100% for TB detection.
- Performance met the World Health Organization's criteria for TB diagnostic tests.
- Sensitivity was 73.3% in non-HIV individuals and 76% in smear-negative TB cases.
Conclusions:
- The optimized urine cfDNA test shows significant promise as a highly accurate, non-sputum-based diagnostic tool for tuberculosis.
- This assay meets key performance benchmarks, suggesting its potential utility in TB diagnostics.
- Further research is warranted to explore the broader application and validation of this cfDNA technique.
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