A cheap test which could detect even low levels of viruses and some cancers has been developed by UK researchers.
The colour of a liquid changes to give either a positive or negative result. The designers from Imperial College London say the device could lead to more widespread testing for HIV and other diseases in parts of the world where other methods are unaffordable.
Early testing showed the presence of markers of HIV and prostate cancer could be detected. However, trials on a much larger scale will be needed before it could be used clinically. The prototype, which needs wider testing, is described in the journal Nature Nanotechnology.
Prof Molly Stevens told the BBC: "This method should be used when the presence of a target molecule at ultra-low concentration could improve the diagnosis of disease.
The researchers expect their design will cost 10 times less than current tests. They say this will be important in countries where the only options are unaffordable.
Fellow researcher Dr Roberto de la Rica said: "This test could be significantly cheaper to administer, which could pave the way for more widespread use of HIV testing in poorer parts of the world."
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