The omicron variant of the coronavirus is now officially here in the United States and spreading around the world. But there are still a lot of questions about it.

Today we hope to help clarify what scientists do, and don't know, about this variant. I'm talking with infectious disease specialist and epidemiologist Dr. Céline Gounder.

She's a practicing physician in New York City and has been a trusted voice throughout the pandemic. She's the host of the "Epidemic" and "American Diagnosis" podcasts and has even advised the White House about COVID-19.

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