CDC data indicate Omicron is starting to eat into Delta’s U.S. dominance

 

 

The Omicron variant is starting to eat into Delta’s dominance in the United States.

The new variant accounted for 2.9% of sequenced Covid-19 cases in the United States in the week ending Dec. 11. The week before, 0% of cases were from Omicron. Delta accounted for essentially all of the other sequenced cases, according to data from the Centers for Disease Control and Prevention.

The new figures, updated Tuesday, indicate that Omicron started circulating before that week, given how long it can take for infections to be sequenced and reported. They show that Omicron’s advantage over the highly transmissible Delta variant is becoming noticeable in this country.

The figure is likely to increase dramatically, given the pattern in other countries. When better-spreading variants enter a new area with other viral iterations circulating, it can take weeks for them to account for even a few percent of all cases. But from there, their prevalence can skyrocket.

 

 

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