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Expanded agreement brings the total number of COVID-19 vaccine doses to be supplied to the U.S. government for donation to one billion Effort contributes to companies’ pledge to deliver two billion COVID-19 vaccine doses to low- and middle-income countries by the end of 2022 Pfizer Inc. (NYSE: PFE) and BioNTech SE (Nasdaq: BNTX) today announced plans to expand their agreement with the U.S. government by providing an additional 500 million doses of the companies’ COVID-19 vaccine at a not-for-…