Biden administration seeks to buy 200 million more vaccine doses, to be delivered through the summer Isaac Stanley-Becker, Laurie McGinley and Christopher Rowland, The Washington Post Jan. 26, 2021 FacebookTwitterEmail WASHINGTON - The Biden administration said Tuesday it was on the cusp of securing an additional 200 million doses of the two coronavirus vaccines authorized for emergency use in the United States. The purchases would increase available supply by 50%, bringing the total to 600 million doses by this summer. Because both products - one developed by Pfizer and German company BioNTech and the other by Moderna - are two-dose regimens, that would be enough to fully vaccinate 300 million people. An estimated 260 million people in the United States are currently considered eligible to receive a coronavirus vaccine, though Pfizer and Moderna have initiated trials for children as young as 12, the results of which could expand the pool.