CNN: How worried should we be about the new "stealth" Omicron? Our expert weighs in. >"As a new subvariant of Omicron spreads rapidly in some parts of the world, CNN Medical Analyst Dr. Leana Wen answers questions about safety for vaccinated people and those who recently had Covid-19."

>"As a new subvariant of Omicron spreads rapidly in some parts of the world, CNN Medical Analyst Dr. Leana Wen answers questions about safety for vaccinated people and those who recently had Covid-19."

>"As a new subvariant of Omicron spreads rapidly in some parts of the world, CNN Medical Analyst Dr. Leana Wen answers questions about safety for vaccinated people and those who recently had Covid-19."