NEW: Omicron overtakes delta as most dominant variant in a matter of weeks, accounting for 73% of new Covid cases in the U.S., CDC says.
The CDC also revised its estimates from the prior week, saying that the omicron variant accounted for 12 percent of all cases for the week ending Dec. 11. It had previously been estimated to be 3 percent.
Omicron overtook the previously dominant delta variant with startling speed. The new highly mutated variant was first detected in South Africa in November; the first case was found in the U.S. on Dec. 1.
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