President Joe Biden is set to announce on Wednesday that the United States is buying 500 million more doses of the Pfizer-BioNTech COVID-19 vaccine to donate to countries around the world, a pledge that will bring the total promised U.S. vaccine donations to more than 1.1 billion.
Biden will make the announcement during remarks at the start of a virtual summit aimed at boosting commitments from other nations and the private sector.
The effort's goal: vaccinate 70 percent of the world's population for COVID within a year's time, senior administration officials told reporters.
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