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A breath test designed to detect COVID-19 and give accurate results within a minute has been approved for use in Singapore, the National University of Singapore said in a statement.

The test, developed by NUS spin-off startup Breathonix, works much like a standard breathalyzer test that police might use to see if an erratic driver is drunk. A person blows into a one-way valve mouthpiece and compounds in the person’s breath — think of it as a breath signature — are compared by machine learning software against the sort of breath signature that would be expected from someone has COVID-19.

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