Pfizer/BioNTech have reached a deal with the United States under which the joint manufacturers of the Covid-19 vaccine will deliver an additional 100 million doses to the country. Pfizer/BioNTech already has a contract to supply US with 100 million doses of its vaccine, and the latest deal will double that. Pfizer/BioNTech said they expect to deliver all the 200 million doses by July 31, 2021.