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Biden urges booster shots amid growing alarm over omicron variant
By Shannon Pettypiece
The Omicron variant: What we know so far
By Yasemin Saplakoglu
Omicron variant symptoms: What we know after UK reports first death
By Adrianna Rodriguez
Omicron: What are the symptoms of the latest COVID variant?
By Pascale Davies
Omicron map: Tracking the new Covid-19 variant around the world
By Jiachuan Wu, Joe Murphy & Nigel Chiwaya