U.S. Health Officials Eye COVID-19 Booster Shots As Variant Spreads

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Watch Video "300 million shots in arms in under 150 days. That's an important milestone," President Joe Biden said.

As increasing numbers of Americans are vaccinated for COVID-19, health officials are exploring whether they will need booster shots in future.

"So, we want to be ahead of this booster question. We're making...

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