Health officials are warning of a potential surge of COVID-19 cases around spring break. The warning comes as more than a million Americans traveled through U.S. airports on Monday. CBS News reporter Alex Tin joins CBSN's "Red & Blue" anchor Elaine Quijano with more on the variant that's expected to become dominant by April, as well as the latest on a new vaccine trial involving children as young as 6 months old.

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