Pfizer Booster Vaccines Rolled Out in U.S.

People across the country got their Pfizer booster shots this weekend. Doctors in the U.S. say there's not enough data to support mixing vaccines. Health officials encourage booster shots for those eligible.» Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews

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Pfizer Booster Vaccines Rolled Out in U.S.