Omicron Covid variant spreads 'more than twice as fast' as Delta
BBC, 05 Dec 2021
Scientists in South Africa say the new Omicron variant of the coronavirus appears to spread more than twice as fast as Delta - which has so far been the most contagious.
The analysis has not been peer-reviewed and the researchers say there's a lot of uncertainty.
Cases are being reported all over the world, including among fully vaccinated people.