WHO designates new COVID strain Omicron as ‘variant of concern’

The World Health Organisation has named the new Covid-19 variant 'Omicron' and says it is concerned about its many mutations. This suggests it may pose even more of a risk than the Delta variant. More countries are restricting travel to and from southern Africa, where Omicron was first identified. Al Jazeera's Nadim Baba reports.

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