Head-to-head comparison of diagnostic accuracy of TB screening tests: chest-X-ray, Xpert TB host response, and C-reactive protein
Background Accessible, accurate screening tests are necessary to advance tuberculosis (TB) case finding and early detection in high-burden countries. We compared the diagnostic accuracy of available TB triage tests. - Methods We prospectively screened consecutive adults with ≥2 weeks of cough presen...
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) Chapter/Article |
| Language: | English |
| Published: |
June 21, 2024
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| In: |
medRxiv
Year: 2024, Pages: 1-16 |
| DOI: | 10.1101/2024.06.20.24308402 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1101/2024.06.20.24308402 Verlag, kostenfrei, Volltext: https://www.medrxiv.org/content/10.1101/2024.06.20.24308402v1 
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| Author Notes: | Rebecca Crowder, Balamugesh Thangakunam, Alfred Andama, Devasahayam J. Christopher, Victoria Dalay, Welile Dube-Nwamba, Sandra V. Kik, Dong Van Nguyen, Nguyen Viet Nhung, Patrick PJ Phillips, Morten Ruhwald, Grant Theron, William Worodria, Charles Yu, Payam Nahid, Adithya Cattamanchi, Ankur Gupta-Wright, Claudia M. Denkinger, R2d2 Tb Network |
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| 520 | |a Background Accessible, accurate screening tests are necessary to advance tuberculosis (TB) case finding and early detection in high-burden countries. We compared the diagnostic accuracy of available TB triage tests. - Methods We prospectively screened consecutive adults with ≥2 weeks of cough presenting to primary health centers in the Philippines, Vietnam, South Africa, Uganda, and India. All participants received the index tests: chest-X-ray (CXR), venous or capillary Cepheid Xpert TB Host Response (HR) testing, and point-of-care C-reactive protein (CRP) testing (Boditech iChroma II). CXR images were processed using computer-aided detection (CAD) algorithms. We assessed diagnostic accuracy against a microbiologic reference standard (sputum Xpert Ultra, culture). Optimal cut-points were chosen to achieve sensitivity ≥90% and maximize specificity. Two-test screening algorithms were considered, using two approaches: 1) sequential negative serial screening in which the second screening test is conducted only if the first is negative and positive is defined as positive on either test and 2) sequential positive serial screening, in which the second screening test is conducted only if the first is positive and positive is defined as positive on both tests. - Results Between July 2021 and August 2022, 1,392 participants with presumptive TB had valid results on index tests and the reference standard, and 303 (22%) had confirmed TB. In head-to-head comparisons, CAD4TB v7 showed the highest specificity when using a cut-point that achieves 90% sensitivity (70.3% vs. 65.1% for Xpert HR, difference 95% CI 1.6 to 8.9; 49.7% for CRP, difference 95% CI 17.0 to 24.3). Among the possible two-test screening algorithms, three met WHO target product profile (TPP) minimum accuracy thresholds and had higher accuracy than any test alone. At 90% sensitivity, the specificity was 79.6% for Xpert HR-CAD4TB [sequential negative], 75.9% for CRP-CAD4TB [sequential negative], and 73.7% for Xpert HR-CAD4TB [sequential positive]. - Conclusions CAD4TB achieves TPP targets and outperforms Xpert HR and CRP. Combining screening tests further increased accuracy. Cost and feasibility of two-test screening algorithms should be explored. - Registration NCT04923958 | ||
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| 700 | 1 | |a Andama, Alfred |e VerfasserIn |4 aut | |
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