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Cases of the Omicron variant have now been detected in 40 countries and at least 13 U.S. states. Concern is growing as health officials warn that numbers are expected to climb.» Subscribe to NBC News:…

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NBC News NOW is live, reporting breaking news and developing stories in real time. We are on the scene, covering the most important stories of the day and taking deep dives on issues you care…

NBC News NOW is live, reporting breaking news and developing stories in real time. We are on the scene, covering the most important stories of the day and taking deep dives on issues you care…

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NBC News NOW is live, reporting breaking news and developing stories in real time. We are on the scene, covering the most important stories of the day and taking deep dives on issues you care…

NBC News NOW NBC News NOW is live, reporting breaking news and developing stories in real time. We are on the scene, covering the most important stories of the day and taking deep dives on…