Omicron may cause milder symptoms. But that's not the only thing doctors are worried about.

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Nov 29, 2021 Omicron may cause milder symptoms. But that's not the only thing doctors are worried about. Those infected with the omicron variant of the coronavirus appear to have "very mild" symptoms, according to the South African doctor who first spotted the variant. And while those early reports are encouraging, experts said, the bigger concern is how quickly the variant might spread and how it will match up against vaccines.  Read More Follow Us Get the NBC News Mobile App Check out all NBC News newsletters here. 30 Rockefeller Plaza New York, NY 10112 View in browser | Unsubscribe | Contact | Privacy