UK says omicron to become its dominant variant within days

The omicron variant of COVID-19 is spreading rapidly throughout Great Britain and is likely to become the dominant form of the disease across the country by the middle of this month, the U.K. Health Security Agency said Friday.

New data from the U.K. confirm that omicron is more easily transmissible than other variants, the agency said in its latest variant technical briefing.

Other studies suggest that both the AstraZeneca and Pfizer vaccines are less effective in preventing symptomatic infections in people exposed to omicron, though preliminary data show that effectiveness appears to rise to between 70% and 75% after a third booster dose.

The latest data show 568 confirmed or probable omicron infections as of Dec. 8, up from just two one week earlier. If current trends continue, the U.K. will exceed 1 million omicron infections by the end of December, the health security agency said.

“Once again, we urge everyone who is able to get a booster jab to come forward and do so,” Dr. Jenny Harries, the agency’s chief executive, said in the briefing paper.

While underscoring earlier warnings about the risks posed by the omicron variant, the agency said the data should be treated with caution because the findings are based on early analysis of a small number of cases.

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