U.S. health officials are explaining why they recently shortened their COVID-19 isolation and quarantine recommendations.
CDC officials previously said the changes were in keeping with evidence that people with the coronavirus are most infectious in the two days before and three days after symptoms develop.
In laying out the scientific basis for the revisions, the agency said more than 100 studies from 17 countries indicate that most transmission happens early in an infection. The CDC acknowledged the data come from research done when delta and other pre-omicron variants were causing the most infections. But the agency also pointed to limited, early data from the U.S.
The agency said lab tests can show positive results long after someone stops being contagious, and that a negative at-home test may not necessarily indicate there is no threat. That's why, the agency said, it was recommending that people wears masks everywhere for the five days after isolation ends. “We do need to come up with a strategy that limits isolation time, but we don’t want it to be one that’s adding to the spread of the virus and unwittingly leading to the virus circulating,” he said.
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