People stand holding shopping bags on Regent Street in London, Monday, Nov. 29, 2021. Countries around the world slammed their doors shut again to try to keep the new omicron variant at bay Monday, even as more cases of the mutant coronavirus emerged and scientists raced to figure out just how dangerous it might be. In Britain, mask-wearing in shops and on public transport will be required, starting Tuesday. (AP Photo/Matt Dunham)
November 29, 2021
Stories this photo appears in:
November 29, 2021 3:25 p.m.
WHO warns that new virus variant poses 'very high' risk
little is known for certain about the variant