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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 & Jinal Bhiman
South Africa accuses UK and others of ‘knee-jerk’ reaction to new variant
By Nick Dall & Lizzy Davies
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Belgium confirms case of new, heavily mutated Covid variant
By Robert Towey & Spencer Kimball
Explainer: What we know about the new COVID-19 variant detected in South Africa
By Alexander Winning & Alistair Smout
COVID: What we know about the omicron variant
By Alexander Freund
Omicron classified 'variant of concern' by WHO: COVID updates
By Joel Shannon, Michael James & Christine Fernando