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WHO labels new Covid strain as 'variant of concern' amid global alarm, names it 'Omicron'
By Saphora Smith
The hunt for coronavirus variants: how the new one was found and what we know so far
By Tulio de Oliveira, Wolfgang Preiser & Jinal Bhiman
Global rush to ban travellers from southern Africa over new Covid-19 variant
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Belgium confirms case of new, heavily mutated Covid variant
By Robert Towey & Spencer Kimball
COVID: What we know about the omicron variant
By Alexander Freund
Explainer: What we know about the new COVID-19 variant detected in South Africa
By Alexander Winning & Alistair Smout
Omicron classified 'variant of concern' by WHO: COVID updates
By Joel Shannon, Michael James & Christine Fernando
Travel doors slam shut as new Covid variant triggers alarm, stranding hundreds of passengers
By Tamara Hardingham-Gill, Laura Smith-Spark & Ivana Kottasová
WHO names new COVID variant omicron, cautions against travel measures
By Stephanie Nebehay & Alexander Winning