June 09, 2021 President Joe Biden will announce the news at the G7 summit in Cornwall, England, this week. WASHINGTON — The United States has purchased and will donate 500 million doses of Pfizer's COVID-19 vaccine worldwide as it seeks to be a key player in getting other nations vaccinated. President Joe Biden will announce the news at the G7 summit in Cornwall, England, this week. Around 200 million doses will go out in 2021 and 300 million will be distributed in the first half of 2022. Biden's top coronavirus adviser, Jeff Zients, has been working on the deal for the last month, a person familiar said. All doses will go through COVAX, the international vaccine initiative, and will go to 92 low- and lower-income countries, in addition to the African Union.