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What we know and don't know about Omicron variant

The World Health Organization says it could still take some time to get a full picture of the threat posed by Omicron, a new variant of the coronavirus as scientists worldwide scramble to assess its multiple mutations. Here's a look at we we know about the variant and why scientists are worried.

Passengers queue to check in, at Heathrow Airport in London, Monday, Nov. 29, 2021. (AP Photo/Frank Augstein)