U.S. Food and Drug administration on Tuesday authorized emergency use of the first over-the-counter COVID-19 antigen test, which can be used at home.The test by Ellume offers a nasal swab analyzer that connects to a software application on users' smartphone, and gives results in 20 minutes.Anyone above two years of age, including those not showing symptoms, can take the test, the agency said.Also Read | Covid curve slumping across IndiaThe news follows authorization of the first prescription COVID-19 test for home use last month, and of a non-prescription test system allowing a lab to process nasal samples collected at home, last week.The regulatory nods will help expand Americans' access to testing, reduce the burden on laboratories and.