According to the U.S. Covid Association, the rapidly-growing omicron strain is the predominant Covid strain, accounting for 73% of all sequenced cases. data published MondayThe Centers for Disease Control and Prevention.

Omicron has replaced the dominant delta variant. The CDC estimates that Omicron now accounts for 26.6% sequenced cases in the week ended December 18. The data show that delta accounted for 87% of the cases, compared to 12.6% in omicron one week prior.

Late November was the first time that Covid-19, an omicron variant of the omicron Covid-19, was detected in Southern Africa. “variant of concern”The World Health Organization, Nov. 26, 2009. It isn’t known exactly when it arrived in the United States. California confirmed the first omicron case on Dec. 1. However, the CDC stated that a patient who developed symptoms on Nov. 15 was also diagnosed with the disease.

The variant is extremely transmissible but much more remains to be discovered about its severity.

The national average of 73% is lower in some areas of the country than it is elsewhere. According to the CDC, it is responsible for over 90% of all cases in parts of Northeast, Southeast, Southeast, Northeast.

The CDC previously released data from the week ended Dec. 11, showing how omicron was represented 2.9% of casesHowever, he has updated the estimate to reflect this upward revision.

This story is still in development. Stay tuned for new updates.