WASHINGTON — Pfizer and BioNTech will supply the U.S. with an additional 100 million doses of the COVID-19 vaccine under a new agreement.

The drugmakers said Wednesday they expect to deliver all the doses by July 31.

Pfizer already has a contract to supply the government with 100 million doses of its vaccine.

Pfizer’s vaccine was the first to gain emergency use approval from the Food and Drug Administration, and initial shipments went to states last week. It has now been joined by a vaccine from Moderna, which was developed in closer cooperation with scientists from the National Institutes of Health.

Moderna’s vaccine comes under the umbrella of the government’s own effort, which is called Operation Warp Speed. That public-private endeavor was designed to have millions of vaccine doses ready and available to ship once a shot received FDA approval.

But the new deal with Pfizer would move the nation closer to the goal of vaccinating all Americans.

A law dating back to the Korean War gives the government authority to direct private companies to produce critical goods in times of national emergency. Called the Defense Production Act, it’s expected to be invoked to help Pfizer secure some raw materials needed for its vaccine.

Pfizer already has a contract to supply the government with 100 million doses of its vaccine under Operation Warp Speed, but government officials have said it’s more of an arms-length relationship with the company and they don’t have as much visibility into its operations.

Pfizer said in a statement that “we continue to work collaboratively with the U.S. government to get doses of our COVID-19 vaccine to as many Americans as possible.”

The vaccine from Pfizer and German pharmaceutical BioNTech immediately raised hopes of taming a pandemic that has killed more than 322,000 people in the U.S. and hobbled much of the national economy. Health care workers and nursing home residents topped the list as local TV stations across the country began broadcasting scenes of the first vaccinations. Some polls show skepticism about getting vaccinated may be easing.

After early failures with testing, Trump administration officials are hoping to write a very different ending with vaccines. Operation Warp Speed has financed the development, manufacture and distribution of millions of doses, with the goal of providing a free vaccine to any American who wants one.

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