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Omicron, the New Covid-19 Variant: What to Know
By Joanna Sugden & Denise Roland
The omicron variant spreads across Europe as new travel bans take effect
By Deepa Shivaram & Nicole Hernandez Hammer
South African doctor who raised alarm about omicron variant says symptoms are 'unusual but mild'
By Peta Thornycroft & Will Brown
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South Africa says it is being punished for early COVID variant detection
By Frances Kerry & Promit Mukherjee
The new Omicron variant is a pandemic gut check
By Jacqueline Howard