WASHINGTON — President Biden said on Tuesday that the United States was “on track” to have enough supply of coronavirus vaccines “for every adult in America by the end of May,” accelerating his effort to deliver the nation from the worst public health crisis in a century.
In a brief speech at the White House, Mr. Biden said his administration had provided support to Johnson & Johnson that would enable the company and its partners to make vaccines around the clock. The administration had also brokered a deal in which the pharmaceutical giant Merck & Co. would help manufacture the new Johnson & Johnson coronavirus vaccine.
Merck is the world’s second-largest vaccine manufacturer, though its own attempt at a coronavirus vaccine was unsuccessful. Officials described the partnership between the two competitors as historic and said it harks back to Mr. Biden’s vision of a wartime effort to fight the coronavirus, similar to the manufacturing campaigns when Franklin D. Roosevelt was president.
“As a consequence of the stepped-up process that I’ve ordered and just outlined, this country will have enough vaccine supply — I’ll say it again — for every adult in America by the end of May,” Mr. Biden said. “By the end of May. That’s progress — important progress.”
He also said he wanted all teachers vaccinated by the end of this month.
The president’s time table, if it comes to pass, provides a bright light at the end of a long, dark tunnel, though he acknowledged that the nation remained in a tenuous situation. The announcement on Tuesday came days after the Food and Drug Administration gave Johnson & Johnson emergency authorization for its vaccine, which unlike the two others that are available requires just one dose.
Public health officials fear a fourth surge of the coronavirus pandemic, fueled by worrisome new variants, as states like Texas and Mississippi rush to fully reopen. While daily caseloads have undergone a steep drop since January, the decline appears to be leveling off, and top federal health officials warned governors last week against relaxing coronavirus restrictions.
“We cannot let our guard down now or assure that victory is inevitable,” Mr. Biden said. “We can’t assume that.”
He had previously said that there would be enough coronavirus vaccines for every American by the end of July. While the president’s remarks on Tuesday set a new marker against which he will be measured, his administration and his predecessor’s had already laid the groundwork to cover the 260 million eligible adults by the end of May.
Two other vaccine manufacturers, Moderna and Pfizer BioNTech, pledged last month to deliver together enough to cover 200 million Americans by that date. Johnson & Johnson’s $1 billion contract, negotiated last year when Donald J. Trump was president, calls for the company to deliver enough doses for another 87 million Americans by the end of May, which would have given the country enough vaccine for all adults 18 and older.
But Johnson & Johnson and its partners fell behind in their manufacturing. The company was supposed to deliver its first 37 million doses by the end of March, but it has said it would be able to deliver only 20 million doses by that date, which made Biden aides nervous.
In late January, Jeffrey D. Zients, Mr. Biden’s coronavirus response coordinator, and Dr. David Kessler, who is managing vaccine distribution for the White House, reached out to top officials at the company, including Alex Gorsky, its chief executive, with a blunt message: This is unacceptable.
That led to a series of negotiations in February in which administration officials repeatedly pressured Johnson & Johnson to accept that they needed help, while urging Merck to be part of the solution, according to two administration officials who participated in the discussions.
In a statement on Tuesday, Merck said the federal government would pay it up to $269 million to adapt and make available its existing facilities to produce coronavirus vaccines. Michael T. Nally, the executive vice president of human health at Merck, said in an interview that the company had been in talks with multiple companies and governments, including officials in the former Trump administration.
“I think we all recognize that every day counts,” he said.
Mr. Nally declined to provide an estimate for how many doses of vaccine the company could ultimately produce, saying only that it would be “substantial.” The expanded supply from Merck, though, is not likely to become available for months.
One federal official, who spoke on the condition of anonymity, said other steps the administration took would move up Johnson & Johnson’s manufacturing timeline.
Those steps, said Jen Psaki, the White House press secretary, included providing a team of experts to monitor manufacturing and logistical support from the Defense Department. In addition, the president will invoke the Defense Production Act, a Korean War-era law, to give Johnson & Johnson access to supplies necessary to make and package vaccines.
Mr. Biden said he would also invoke the law to help Merck retrofit one of two manufacturing plants that would be used in the production process.
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Vaccine manufacturing is a notoriously finicky and unpredictable process, especially in the early stages. Merck makes vaccines for 11 of the 17 diseases on the federal government’s immunization roster — including measles, mumps, rubella and chickenpox — and the company has been searching for a role to play in the coronavirus program for nearly a year.
“The only party that really understood vaccine manufacturing and had a stellar record of it is now having to be brought in to manufacture someone else’s vaccine,” said Steve Brozak, the president and managing director of WBB Securities, which invests in companies that focus on infectious diseases.
Trump and Biden administration officials had explored enlisting Merck’s help in manufacturing vaccines developed by other companies. Federal officials said talks about a possible partnership between Merck and Johnson & Johnson had been underway for months. But Ms. Psaki said the Biden White House deserved credit for getting the deal “across the finish line.”
The arrangement is not without precedent. Johnson & Johnson signed a deal late last month with the French manufacturer Sanofi, which is also developing a coronavirus vaccine, to help fill and pack the Johnson & Johnson vaccines in Europe. Sanofi and the Swiss pharmaceutical giant Novartis have also signed deals with Pfizer to help manufacture its vaccine in Europe.
“This is a type of collaboration between companies we saw in World War II,” Mr. Biden said at the White House. He thanked Merck and Johnson & Johnson for “stepping up and being good citizens during this crisis.”
Under the agreement, Merck will dedicate two of its facilities to production of the Johnson & Johnson vaccine.
One will provide “fill-finish,” the final phase of the manufacturing process during which the vaccine is placed in vials and packaged for shipping. The other will make the “drug substance”: the vaccine itself.