Rapid Implementation of New TB Diagnostic Tests: Is It Too Soon for a Global Roll-Out of Xpert MTB/RIF?

Daniela E. Kirwan Department of Infectious Diseases and Immunity, Imperial College London, United Kingdom; CRONICAS Center of Excellence in Chronic Diseases, Universidad Peruana Cayetano Heredia, Lima, Peru; Department of International Health, School of Public Health, Johns Hopkins University, Baltimore, Maryland

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María Kathia Cárdenas Department of Infectious Diseases and Immunity, Imperial College London, United Kingdom; CRONICAS Center of Excellence in Chronic Diseases, Universidad Peruana Cayetano Heredia, Lima, Peru; Department of International Health, School of Public Health, Johns Hopkins University, Baltimore, Maryland

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Robert H. Gilman Department of Infectious Diseases and Immunity, Imperial College London, United Kingdom; CRONICAS Center of Excellence in Chronic Diseases, Universidad Peruana Cayetano Heredia, Lima, Peru; Department of International Health, School of Public Health, Johns Hopkins University, Baltimore, Maryland

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In 2011 the World Health Organization approved Xpert MTB/RIF for tuberculosis diagnosis and recommended its rapid implementation. Xpert MTB/RIF is accurate: sensitivity is 72.5 –98.2% (smear-negative and -positive cases, respectively) and specificity 99.2%. Benefits include same-day diagnosis and simultaneous detection of rifampicin resistance. However, the test has some shortcomings and has not had time for thorough evaluation. Cost-effectiveness studies are difficult to perform and few have been completed. Existing data suggest cost-effectiveness in some, but not all, settings. The urgent need for better diagnostics is evident. Yet, serial implementation of new technologies causes ineffective spending and fragmentation of services. How new tests are incorporated into existing diagnostic algorithms affects both outcomes and costs. More detailed data on performance, effect on patient-important outcomes, and costs when used with adjunct tests are needed for each setting before implementation. While awaiting further clarification it seems prudent to slow its implementation among resource-constrained tuberculosis control programs.

Author Notes

*Address correspondence to Daniela E. Kirwan, Department of Infectious Diseases and Immunity, 8N.12, Commonwealth Building, Imperial College London, Du Cane Road, London W12 0NN, United Kingdom. E-mail: dannikirwan@yahoo.com

Authors' addresses: Daniela E. Kirwan, Department of Infectious Diseases and Immunity, Imperial College London, London, United Kingdom, E-mail: dannikirwan@yahoo.com. María Kathia Cárdenas, CRONICAS, Center of Excellence in Chronic Diseases, Universidad Peruana Cayetano Heredia, Lima, Peru, E-mail: mariakathiacgs@gmail.com. Robert H. Gilman, Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, E-mail: rgilman@jhsph.edu.

Reprint requests: Daniela E. Kirwan, Department of Infectious Diseases and Immunity, 8N.12, Commonwealth Building, Imperial College London, Du Cane Road, London W12 0NN, United Kingdom, E-mail: dannikirwan@yahoo.com.

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