White House expected to tell governors they will get more coronavirus vaccine doses starting next week

The Biden administration said Tuesday it will seek to buy another 200 million doses of the two coronavirus vaccines that have been authorized for emergency use in the United States. The purchases would increase available supply by 50 percent, 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