Coronavirus: US approves new antigen test with fast results

US regulators have approved a new type of coronavirus test that administration officials have promoted as a key to opening up the country.The Food and Drug Administration on Saturday announced emergency authorisation for antigen tests developed by Quidel Corporation of San Diego. The test can rapidly detect fragments of virus proteins in samples collected from swabs swiped inside the nasal cavity, the FDA said in a statement.The antigen test is the third type of test to be authorised by the FDA…

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