U.S. Vaccine Supply Is Poised to Double

The U.S. vaccine supply is about to get a whole lot bigger.

Currently, the U.S. is administering 1.6 million doses a day, constrained by the current supply of about 10 million to 15 million doses a week. But manufacturers and U.S. officials have accelerated their production timelines and signaled that the spigots are about to open. That will provide hundreds of millions of doses to match the growing capacity to immunize people at pharmacies and mass-vaccination sites.