New COVID Variant XBB Is Gaining Ground Among Americans

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New COVID Variant XBB Is Gaining Ground Among Americans
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U.S. health officials are tracking a new COVID variant that's a combination of two earlier Omicron subvariants.

Known as XBB, this latest subvariant now represents 3.1% of new COVID cases throughout the U.S. and 5% of cases in the Northeast., cases of XBB may be doubling every 12 days.

in the [receptor-binding domain], which meant that it might be an escape variant," explained Smith, who helps lead a National Institute of Health's effort to analyze emerging variants.

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