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New tuberculosis blood test in children is reliable and highly specific
Date:8/31/2014

A new blood test provides a fast and accurate tool to diagnose tuberculosis in children, a new proof-of-concept study shows. The newly developed test (TAM-TB assay) is the first reliable immunodiagnostic assay to detect active tuberculosis in children. The test features excellent specificity, a similar sensitivity as culture tests in combination with speed of a blood test. The promising findings are a major advance for the diagnosis of tuberculosis in children, particularly in tuberculosis-endemic regions.

The study has been published on Sept 1st, 2014 in Lancet Infectious Diseases.

Tuberculosis (TB) in children is a serious public health problem especially in low-resource countries. About one million children per year develop tuberculosis worldwide. Unfortunately, the diagnosis of paediatric TB poses a major challenge. TB symptoms in children are often non-specific and similar to those of common paediatric illnesses, including pneumonia and malnutrition. Further, obtaining adequate respiratory specimens for direct mycobacterial confirmation is problematic. Consequently, there is an urgent need for a more precise, rapid and affordable diagnostic test for childhood tuberculosis.

The new so-called TAM-TB assay is a sputum-independent blood test. It makes use of an immunological phenomenon during tuberculosis disease: During an active infection, the expression of CD27 a surface marker expressed on mycobacteria specific CD4+ T cells is lost. Using standard intracellular cytokine staining procedures and polychromatic flow cytometry, the test result is available within 24 hours after blood sampling.

New blood test assessed in tuberculosis endemic regions in Tanzania

The new test was assessed in tuberculosis endemic regions in Tanzania at the Ifakara Health Institute and the NIMR Mbeya Medical Research Center. Sputum and blood samples were obtained from children with tuberculosis symptoms to compare the
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Contact: Klaus Reither
Klaus.Reither@unibas.ch
41-612-848-967
Swiss Tropical and Public Health Institute
Source:Eurekalert

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