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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)

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WATCH LIVE NOW | Quebec confirms first case of new COVID-19 Omicron variant

Quebec's health minister announced Monday the province has confirmed its first case of the new COVID-19 variant known as Omicron that has spread to several countries and put health officials around the world on heightened alert.