BREAKING NEWS

The C.D.C. lowered its estimate of Omicron's prevalence in the U.S., showing the agency's struggle to communicate its uncertainty.

Tuesday, December 28, 2021 3:08 PM EST

The Centers for Disease Control and Prevention estimated that the Omicron variant now accounts for roughly 59 percent of all Covid cases in the United States, a significant decrease from the agency's previous estimate.

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