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Expanding testing to more asymptomatic people will depend in large part on how easy the test is to conduct—do-it-yourself and home-based tests will probably be necessary. In addition to saliva-based tests that require people to spit into tubes, researchers at other companies are also looking into paper strips that can read saliva samples. Decision Diagnostics, a California-based company that is the leading manufacturer of diabetic test strips, for example, has developed a saliva-based strip test for COVID-19 that is being tested in South Korea.

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