A least 15 states in the United States have so far reported the Omicron variant of the coronavirus. The number is likely to rise further in the coming weeks, but the Delta variant remains the major threat, according to the country's top health officials.
"We know we have several dozen cases and we're following them closely. And we are every day hearing about more and more probable cases so that number is likely to rise," CDC Director Dr. Rochelle Walensky said in an interview with ABC News on Sunday.
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