The Omicron variant has become a large majority in the United States, accounting for 73.2% of new Covid-19 infections during the week ending December 18, according to data from US health authorities.
Covid-19: what do we know about the dangerousness of the Omicron variant?
The highly transmissible Omicron took over the Delta variant within weeks and accounts for up to 96.3% of new cases in three northwestern US states (Oregon, Washington and Idaho) , according to the Centers for Disease Prevention and Control.