Pfizer has struck a second agreement with the U.S. government to supply additional 100 million doses of its COVID-19 vaccine by July 2021, the company said on Wednesday.

The agreement brings the total number of doses to be delivered to the United States to 200 million, allowing for 100 million people to be vaccinated.

The government already has a deal with Pfizer for 100 million doses of the vaccine, which are being rolled out across the country after the shot won emergency use authorization earlier this month.