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Immunologist ‘not panicked’ as Canada confirms first cases of Omicron variant

The new Omicron COVID-19 variant, also known as B.1.1.529, has arrived in Canada, and the number of infections is expected to rise. Abigail Bimman looks at what's still unknown about Omicron, how health officials are responding, and why at least one expert says you shouldn't panic.
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