How Covid variants like omicron develop and what makes them variants 'of concern'

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Nov 27, 2021 How Covid variants like omicron develop and what makes them variants 'of concern' The identification this week of a new Covid variant, dubbed omicron, comes after scientists in South Africa were concerned about its high number of mutations and swift spread among young people. While viruses like Covid evolve all the time, here's what led the World Health Organization to classify omicron a "variant of concern." 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