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Health officials tracking new 'stealth' omicron sub-variant

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Public health officials are tracking a new omicron sub-variant, known as the "stealth" variant, which has been detected in at least 49 countries. Vaccine manufacturers are watching it closely, including Moderna, who says its phase two trial for an omicron-specific booster is underway.

Appearing:Savannah GutherieHoda Kotb
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