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