On Jul. 23, 2021, Pfizer and BioNTech announced that the U.S. government had purchased an additional 200 million doses of the Pfizer-BioNTech COVID-19 Vaccine.

These doses were expected to be delivered from October 2021 through April 2022. This brought the total number of doses to be supplied by the companies to the U.S. government under its existing supply agreement to 500 million.