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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.

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Unvaccinated travellers barred from planes and trains as of today

Unvaccinated travellers over the age of 12 won't be able to board a plane or passenger train in Canada beginning today, and a negative COVID-19 test will no longer serve as a substitute for most people. The stringent new requirement comes into effect as Canada reacts to the emergence of the Omicron variant.

People wearing protective equipment check in at the international departures at Pearson International Airport during the COVID-19 pandemic in Toronto on Monday, December 14, 2020. (THE CANADIAN PRESS/Nathan Denette

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