(CNN) The Trump administration will purchase an additional 100 million doses of coronavirus vaccine from Pfizer, the US Department of Health and Human Services announced Wednesday. With this agreement, the federal government will have purchased 200 million doses of Pfizer/BioNTech's Covid-19 vaccine for $4 billion. The agreement includes an option for an additional 400 million doses of the vaccine, HHS said. Pfizer said the US government will pay $1.95 billion for the additional 100 million doses. Last week, HHS Secretary Alex Azar said negotiations to purchase more coronavirus vaccine were complicated by Pfizer supply chain issues that will make it more challenging for the company to produce 100 million more vaccine doses in the spring.

Source: CNN December 23, 2020 18:11 UTC