Britain tightens COVID rules as world on alert over omicron

The U.K. tightened up rules Saturday on mask-wearing and on testing of international arrivals after finding two cases of the new potentially more contagious omicron variant of the coronavirus that was identified just a few days ago in South Africa.

source https://medicalxpress.com/news/2021-11-britain-tightens-covid-world-omicron.html