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    • Finally a urine test...

    Finally a urine test for accurate tuberculosis detection

    Written by Anjali Nimesh Nimesh Published On 2017-12-13T20:30:40+05:30  |  Updated On 13 Dec 2017 8:30 PM IST
    Finally a urine test for accurate tuberculosis detection

    Scientists have finally developed a noninvasive tuberculosis test for a pool of people for whom such assessments have previously been difficult: people who don't have HIV. The researchers' test detects active tuberculosis infections from urine samples.


    They say the technology has urgently needed and broad implications for screening, transmission control, and treatment management. Tuberculosis is one of the most common bacterial infections, with 9.6 million cases and 1.5 million deaths reported worldwide in 2014.


    Previous attempts to develop urine tests for TB (ideal in low-resource settings because samples can be collected noninvasively and without specialized training) have only detected infections in HIV-positive patients, possibly because immune suppression leads to substantially elevated bacteria levels in the body. Seeking to capture small amounts of a sugar called LAM (which partially comprises the tuberculosis bacterium's outer coat) in urine, Luisa Paris and colleagues screened 37 compounds to narrow in on a copper complex dye called RB221 that they embedded in tiny hydrogel meshes to form structures called nanocages.


    The RB221 nanocages trapped LAM from urine, increasing detection sensitivity by 100- to 1,000 fold, all while excluding interfering compounds from the samples that could confound results. In 48 Peruvian HIV-negative tuberculosis patients who hadn't yet been treated, the new test detected infections with greater than 95% sensitivity. What's more, elevated LAM concentrations in urine correlated with increased amounts of bacteria and more severe disease (as measured by weight loss or a cough). The researchers also created nanocages to trap and detect other hallmarks of infection including very low abundance molecules named ESAT6 and CFP10. According to the authors, their next steps are to compare urinary LAM in patients before and after therapy to evaluate potential treatment-induced changes.


    For more details click on the link: http://dx.doi.org/10.1126/scitranslmed.aal2807
    HIVmoleculessevere diseaseTBTuberculosistuberculosis infectionsurine samplesurine tests
    Source : Eureka Alert

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    Anjali Nimesh Nimesh
    Anjali Nimesh Nimesh
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