US booster shots start, even as millions remain unprotected
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.
source https://medicalxpress.com/news/2021-09-booster-shots-millions-unprotected.html
source https://medicalxpress.com/news/2021-09-booster-shots-millions-unprotected.html
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