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WHO names transmissible new COVID-19 variant 'Omicron'
By Jamey Keaten
The hunt for coronavirus variants: how the new one was found and what we know so far
By Tulio de Oliveira, Wolfgang Preiser & Marietjie Venter
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
WHO labels new Covid strain as 'variant of concern' amid global alarm, names it 'Omicron'
By Saphora Smith
Travel doors slam shut as new Covid variant triggers alarm, stranding hundreds of passengers
By Tamara Hardingham-Gill, Laura Smith-Spark & Ivana Kottasová
November 26 Omicron variant news
By Melissa Mahtani, Adrienne Vogt & Aditi Sangal
Explainer: What we know about the new COVID-19 variant detected in South Africa
By Alexander Winning & Alistair Smout
WHO names new COVID variant omicron, cautions against travel measures
By Stephanie Nebehay & Alexander Winning