LONDON — Pharma giants GlaxoSmithKline and Sanofi Pasteur have announced they will supply 100 million doses of an experimental COVID-19 vaccine to the United States as governments buy up supplies in hopes of securing a candidate that works. 

The United States will pay up to $2.1 billion “for development including clinical trials, manufacturing, scale-up and delivery” of the vaccine, the two companies based in Europe said in a statement. Sanofi will get the bulk of the funds.

The U.S. government has a further option for the supply of an additional 500 million doses longer term as part of its Operation Warp Speed program.

“The portfolio of vaccines being assembled for Operation Warp Speed increases the odds that we will have at least one safe, effective vaccine as soon as the end of this year,” U.S. Health and Human Services Secretary Alex Azar said in a statement. “Today’s investment supports the Sanofi and GSK adjuvanted product all the way through clinical trials and manufacturing, with the potential to bring hundreds of millions of safe and effective doses to the American people.”

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