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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.

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