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Devising an inexpensive, quick tuberculosis test for developing areas

Date:
December 16, 2015
Source:
American Chemical Society
Summary:
Tuberculosis (TB) is a highly infectious disease and a major global health problem, especially in countries with developing health care systems. Because there is no fast, easy way to detect TB, the deadly infection can spread quickly through communities. Now, scientists report on the development of a rapid, sensitive and low-cost method for detecting the disease in resource-limited areas.
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Researchers have developed a quick, cheap and accurate method to test for the bacterium that causes tuberculosis.
Credit: National Institute of Allergy and Infectious Diseases

Tuberculosis (TB) is a highly infectious disease and a major global health problem, especially in countries with developing health care systems. Because there is no fast, easy way to detect TB, the deadly infection can spread quickly through communities. Now, a team reports in ACS Sensors the development of a rapid, sensitive and low-cost method for detecting the disease in resource-limited areas.

The typical way that physicians screen for TB, which is caused by the bacterium Mycobacterium tuberculosis (Mtb), is with a tuberculin skin test or an examination of a patient's sputum under a microscope. To weed out false positives, a more reliable test that involves growing Mtb cultures can be performed, but that requires weeks to complete. For all of these methods, experienced personnel are needed. Another approach that is both quick and accurate is a nucleic acid amplification test, which makes many copies of the Mtb DNA in a sample. However, it is expensive and requires a lab setting. So, Matt Trau, Nicholas P. West and colleagues set out to create a simple, inexpensive and reliable way to quickly test for TB.

The researchers began with a newly created nucleic acid amplification test that does not require expensive lab equipment to detect Mtb. Still, this modified test typically uses costly fluorescence technology to read the results. So the team substituted the fluorescence detector with a colorimetric assay that changes to a blue hue if the infection is present, allowing health care workers to identify positive test results right away with the naked eye. They demonstrated how the modified diagnostic could be put on cheap, disposable electrochemical sensors for increased sensitivity, even in the field. Because the assay is inexpensive, quick and highly specific for the Mtb bacterium, the researchers say it could have a big impact in low-resource communities.


Story Source:

The above post is reprinted from materials provided by American Chemical Society. Note: Content may be edited for style and length.


Journal Reference:

  1. Benjamin Y. C. Ng, Eugene J. H. Wee, Nicholas P. West, Matt Trau. Naked-Eye Colorimetric and Electrochemical Detection ofMycobacterium tuberculosis—toward Rapid Screening for Active Case Finding. ACS Sensors, 2015; DOI: 10.1021/acssensors.5b00171

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American Chemical Society. "Devising an inexpensive, quick tuberculosis test for developing areas." ScienceDaily. ScienceDaily, 16 December 2015. <www.sciencedaily.com/releases/2015/12/151216135828.htm>.
American Chemical Society. (2015, December 16). Devising an inexpensive, quick tuberculosis test for developing areas. ScienceDaily. Retrieved August 24, 2016 from www.sciencedaily.com/releases/2015/12/151216135828.htm
American Chemical Society. "Devising an inexpensive, quick tuberculosis test for developing areas." ScienceDaily. www.sciencedaily.com/releases/2015/12/151216135828.htm (accessed August 24, 2016).

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