The United States has halved the recommended isolation time for people with asymptomatic Covid infections from 10 to five days.
The Centres for Disease Control said that this must be followed by five days of wearing a mask around others.
While the new recommendations are not mandatory, they are closely followed by many businesses and policymakers across the US.
It comes as a surge in Covid cases causes travel chaos across the country.
President Joe Biden has pledged to deal with a shortage of tests as Omicron threatens to overwhelm hospitals.
The CDC said the change is "motivated by science" demonstrating that most transmission happens early in the course of illness.
[Source: BBC]
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