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Pfizer booster vaccines rolled out in U.S.
NBC News Clone summarizes the latest on: Mmvo122039365870 - Breaking News | NBC News Clone. This article is rewritten and presented in a simplified tone for a better reader experience.
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.
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