Millions of Americans are being immunized every day in the U.S. as their vaccination rollout ramps up, with up to three million doses being administered daily.
But the Centers for Disease Control and Prevent (CDC) is concerned that cases and hospitalizations are on the rise even as several states are beginning to lift restrictions, with some having even ended mask mandates.
As Jennifer Johnson reports, scientists are still trying to determine whether those vaccinated can still get the virus and if they can spread it.
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