The U.S. Department of Health and Human Services (HHS) and the Department of Defense (DOD) will purchase an additional 100 million doses of the COVID-19 vaccine from Pfizer and BioNTech for delivery in 2021. “Under the agreement, Pfizer will manufacture and deliver up to 100 million doses of its SARS-CoV-2 vaccine, BNT162b2, to Government designated locations,” a DOD statement on Dec. 23 states. “Pfizer will deliver at least 70 million doses by June 30, 2021, with the balance of the 100 million doses to be delivered no later than July 31, 2021.” This new purchase will allow for a “seamless transition” from the initial 100 million doses of the vaccine authorized by the Food and Drug Administration (FDA) on Dec. 11, bringing the total doses purchased to 200 million. The cost of the 200 million doses to the government has been $4 billion. The vaccine was developed as part of Operation …