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FILE - This file image provided by The National Institute of Allergy and Infectious Diseases (NIAID) shows SARS-CoV-2 (orange) the virus that causes COVID-19—isolated from a patient in the U.S., emerging from the surface of cells (green) cultured in the lab. A new type of coronavirus test offers a cheaper, quicker way to screen for infections, moving the U.S. toward the kind of mass screening that experts say is essential to returning millions of Americans to school and work. But the first so-called antigen test _ announced Saturday, may 9, 2020 by the Food and Drug Administration _ is not quite the kind sought by top government health officials. It is less accurate than the current gold standard for testing and can only be run on specialized equipment. (NIAID-RML via AP)

FILE - This file image provided by The National Institute of Allergy and Infectious Diseases (NIAID) shows SARS-CoV-2 (orange) the virus that causes COVID-19—isolated from a patient in the U.S., emerging from the surface of cells (green) cultured in the lab. A new type of coronavirus test offers a cheaper, quicker way to screen for infections, moving the U.S. toward the kind of mass screening that experts say is essential to returning millions of Americans to school and work. But the first so-called antigen test _ announced Saturday, may 9, 2020 by the Food and Drug Administration _ is not quite the kind sought by top government health officials. It is less accurate than the current gold standard for testing and can only be run on specialized equipment. (NIAID-RML via AP)

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