The F.D.A.’s authorization of Pfizer’s Covid shot for 12- to 15-year-olds is a milestone in battling the coronavirus, but actually getting them vaccinated involves new challenges.

The race is on to vaccinate the nation’s nearly 17 million 12- to 15-year-olds against Covid-19.

The Food and Drug Administration’s decision on Monday to authorize the Pfizer-BioNTech vaccine for younger adolescents presents a new opportunity in the push for broad immunity against the coronavirus in the United States. But the challenges of getting them vaccinated are more complicated than for adults and older teenagers.

States, counties and school districts around the country are trying to figure out the most reassuring and expedient ways to reach younger adolescents as well as their parents, whose consent is usually required by state law. They are making plans to offer vaccines not only in schools, but also at pediatricians’ offices, day camps, parks and even beaches.

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