Ms. Psaki said the administration was working with states to determine what kinds of settings made the most sense at this point in the vaccination campaign.

“We’re constantly evaluating the best delivery mechanisms,” she said, “and if something is not the most effective one, we will make changes.”

Mr. Biden suggested that family doctors and pediatricians will play a key role in propelling the vaccination program, as will other community figures. If the Pfizer vaccine is authorized for adolescents, he said, the administration plans to immediately make it available to them at about 20,000 pharmacies that participate in the federal vaccination program.

But some doses will be shipped directly to pediatricians so that “parents and their children can talk to their family doctor about it and get the shot from a provider they trust the most,” the president said. Dr. Vivek Murthy, the surgeon general, said last week that about “80 percent of people who are trying to decide about a vaccine say that they want to talk to their doctor about that decision — and we’ve heard that loud and clear.”

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