The Omicron variant causes over 73% of new coronavirus cases in the US, according to estimates posted Monday by the US Centers for Disease Control and Prevention.
The week ending Dec. 18, Omicron accounted for 73.2% of cases, with delta making up an additional 26.6%.
The week prior, ending Dec. 11, Omicron was estimated at 12.6% of circulating virus, versus Delta’s 87%. Previously, the CDC estimated Omicron accounted for about 3% that week.
The week ending Dec. 4, Omicron caused less than 1% of new cases.
Omicron is even more prevalent in certain parts of the country — making up over 95% of circulating virus in parts of the northwest and southeast.