The U.S. is buying an additional 500 million doses of Pfizer's COVID-19 vaccine over the next year, which it will share with the global supply.
ABC News Special Report: Biden announces plan to donate 500M doses of Pfizer vaccine to global supply
The U.S. is buying an additional 500 million doses of Pfizer's COVID-19 vaccine over the next year, which it will share with the..
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