The U.S. launched a campaign to offer boosters of Pfizer’s COVID-19 vaccine to millions of Americans on Friday even as federal health officials stressed the real problem remains getting first shots to the unvaccinated.
The U.S. launched a campaign to offer boosters of Pfizer’s COVID-19 vaccine to millions of Americans on Friday even as federal health officials stressed the real problem remains getting first shots to the unvaccinated.
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