A significant proportion of people infected with the omicron variant of coronavirus were still contagious when they reach the U.S.
Researchers classified patients as still contagious if the cycle threshold count on their PCR tests registered a value less than 30, which is a “proxy for potential infectivity and antigen test positivity." Researchers found that among the 70 identified omicron cases detected two or more days after a negative or inconclusive test result, 39% were still infectious after five days, declining to 33% on day six and 22% on day seven.
The paper used data from 10,324 PCR tests conducted among NBA players and employees between July 10, 2021, and January 10, 2022.its recommendation for self-isolation for asymptomatic people who had tested positive for Covid from 10 days to five days followed by five days of masking around others. The CDC’s decision to not include a test-out requirement in its updated guidelines
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