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MONDAY, Jan. 3, 2022 (HealthDay News) – Right now, Americans who have tested positive for COVID-19 but have no symptoms are advised by the U.S. Centers for Disease Control and Prevention to isolate for five days and then wear a mask for another five days when around others. But they could soon be asked to also receive a negative antigen test before ending their isolation, Anthony Fauci, M.D., said Sunday.