CDC: people who test positive for Covid with no symptoms should isolate just five days

US health authorities half recommended isolation time and say asymptomatic people should wear a mask for another five days

US health authorities have halved, to five days, the recommended isolation time for Americans with asymptomatic Covid.

The US is facing a huge surge in Covid cases, fueled by the Omicron variant, which contributed to travel chaos over Christmas and stoked worries about damage to the economy and education.