Why it’s taking people with COVID-19 so long to finally get a negative test

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Why it’s taking people with COVID-19 so long to finally get a negative test
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Some 60% to 70% of infected people still test positive on a rapid test five days after the onset of symptoms or their first positive test, meaning they should still stay in isolation.

Travelers pass a sign near a COVID-19 testing site in Terminal E at Logan Airport, on Dec. 21, 2021, in Boston.By Rong-Gong Lin II and Luke Money, Los Angeles Times

Dr. Robert Kosnik, director of UC San Francisco’s occupational health program, said at a campus town hall in July that there’s an expectation people will test negative on Day 5 and can return to work the next day. “However,” the study noted, “a positive antigen test result does not necessarily mean that a person is infectious. Similarly, a negative test result does not necessarily mean that a person is not infectious. Nonetheless, a positive or negative antigen test might be a useful proxy for the risk for being infectious.”

Day 0: Start of COVID-19 symptoms or the day of your first positive coronavirus test, if you’re asymptomatic. Wear a highly protective mask around others if in the same room as others in your home.Day 5: You can take a rapid test. If you test negative, don’t have a fever and your symptoms are improving, you can exit isolation on Day 6.

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