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WHO names transmissible new COVID-19 variant 'Omicron'
By Jamey Keaten
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Announcement of new virus variant alarms world, as stocks crash and flights are banned
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WHO names new COVID variant omicron, cautions against travel measures
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COVID: What we know about the omicron variant
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Omicron classified 'variant of concern' by WHO: COVID updates
By Joel Shannon, Michael James & Christine Fernando
Explainer: What we know about the new COVID-19 variant detected in South Africa
By Alexander Winning & Alistair Smout