WASHINGTON — The Biden administration has decided that most Americans should get a coronavirus booster vaccination eight months after they received their second shot, and could begin offering third shots as early as mid- to late September, according to administration officials familiar with the discussions.
Officials are planning to announce the decision as early as this week. Their goal is to let Americans who received the Pfizer-BioNTech or Moderna vaccines know now that they will need additional protection against the Delta variant that is causing caseloads to surge across much of the nation. The new policy will depend on the Food and Drug Administration’s authorization of additional shots.
Officials said they expect that recipients of the Johnson & Johnson vaccine, which was authorized as a one-dose regimen, will also require an additional dose. But they are waiting for the results of that firm’s two-dose clinical trial, expected later this month.
The first boosters are likely to go to nursing home residents and health care workers, followed by other older people who were near the front of the line when vaccinations began late last year. Officials envision giving people the same vaccine they originally received.
The decision comes as the Biden administration is struggling to regain control of a pandemic that it had claimed to have tamed little more than a month ago. President Biden had declared the nation reopened for normal life for the July 4 holiday, but the wildfire spread of the Delta variant has thwarted that. Covid patients are again overwhelming hospitals in some states, and federal officials are worried about a jump in children hospitalized because of the virus just as the school year is set to begin.
For weeks, Biden administration officials have been analyzing the rising trend in Covid-19 cases, trying to figure out if the Delta variant is better able to evade the vaccines than earlier versions of the virus, or if the vaccines were losing potency. According to some administration experts, both could be true, worsening a pandemic that the nation fervently hoped had been curbed.
Officials have been particularly concerned about data from Israel suggesting that the Pfizer-BioNTech vaccine’s protection against severe disease has fallen significantly for elderly people who got their second shot in January or February.
Israel can in some ways be viewed as a kind of template for the United States, because it vaccinated more of its population faster. Unlike the United States, it has almost exclusively used the Pfizer-BioNTech vaccine, and has a nationalized health care system that allows it to systematically track patients.
The latest data from Israel, posted on the government’s website on Monday, shows what some experts describe as continued erosion of the efficacy of the Pfizer vaccine over time — both against mild or asymptomatic Covid-19 infections in general and against severe disease among the elderly.
“It shows a pretty steep decline and effectiveness against infection, but it’s still a bit murky about protection against severe disease,” said Dr. Peter J. Hotez, a vaccine expert at the Baylor College of Medicine in Houston, who reviewed the data posted by Israel at the request of The New York Times.
Understand the State of Vaccine and Mask Mandates in the U.S.
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- Mask rules. The Centers for Disease Control and Prevention in July recommended that all Americans, regardless of vaccination status, wear masks in indoor public places within areas experiencing outbreaks, a reversal of the guidance it offered in May. See where the C.D.C. guidance would apply, and where states have instituted their own mask policies. The battle over masks has become contentious in some states, with some local leaders defying state bans.
- Vaccine rules . . . and businesses. Private companies are increasingly mandating coronavirus vaccines for employees, with varying approaches. Such mandates are legally allowed and have been upheld in court challenges.
- College and universities. More than 400 colleges and universities are requiring students to be vaccinated against Covid-19. Almost all are in states that voted for President Biden.
- Schools. On Aug. 11, California announced that it would require teachers and staff of both public and private schools to be vaccinated or face regular testing, the first state in the nation to do so. A survey released in August found that many American parents of school-age children are opposed to mandated vaccines for students, but were more supportive of mask mandates for students, teachers and staff members who do not have their shots.
- Hospitals and medical centers. Many hospitals and major health systems are requiring employees to get a Covid-19 vaccine, citing rising caseloads fueled by the Delta variant and stubbornly low vaccination rates in their communities, even within their work force.
- New York. On Aug. 3, Mayor Bill de Blasio of New York announced that proof of vaccination would be required of workers and customers for indoor dining, gyms, performances and other indoor situations, becoming the first U.S. city to require vaccines for a broad range of activities. City hospital workers must also get a vaccine or be subjected to weekly testing. Similar rules are in place for New York State employees.
- At the federal level. The Pentagon announced that it would seek to make coronavirus vaccinations mandatory for the country’s 1.3 million active-duty troops “no later” than the middle of September. President Biden announced that all civilian federal employees would have to be vaccinated against the coronavirus or submit to regular testing, social distancing, mask requirements and restrictions on most travel.
Dr. Jesse L. Goodman, a former chief scientist with the Food and Drug Administration, said the Israeli data suggested “worrisome trends” that could signal waning of vaccine effectiveness. But he said he would like to see further detail from Israel and, more important, data indicating whether the United States is headed in the same direction.
Federal officials said the booster program will most likely follow much the same scenario as the initial vaccination program. The first shots for the general public in the United States were administered on Dec. 14, days after the F.D.A. authorized the Pfizer shot for emergency use. People started receiving the Moderna vaccine a week later.
While frontline health care workers and nursing home residents were among the first to get inoculated nationwide, states followed their own plans for who else was eligible for shots in the early weeks and months of the vaccination campaign.
But almost everyone 65 and older qualified for vaccination by late February, as did many police officers, teachers, grocery store employees and other people at risk of being exposed to the virus on the job.
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