A COVID-19 vaccine made by Pfizer and its German partner, BioNTech, is safe and effective enough to give to younger teens, the Food and Drug Administration said Monday in authorizing its use.

The decision means adolescents ages 12 to 15 could qualify for shots as soon as Thursday, after the Wednesday meeting of an advisory committee to the Centers for Disease Control and Prevention.

President Joe Biden said last week that 20,000 pharmacy locations are ready to begin vaccinating adolescents once the necessary approvals come through.

Shots also will be available soon through pediatricians’ offices, the president said. “And if teens are on the move this summer, they can get their first shot in one place and a second shot elsewhere.”

That may be more complicated in reality. FDA officials speaking late Monday said that while their authorization covers the entire country, each state may have its own rules about who can administer vaccines, so not all pharmacies or vaccination sites available to adults will be open to adolescents.

Older teens, ages 16 and 17, have been allowed to get the Pfizer-BioNTech vaccine since it was authorized in December. The other two vaccines authorized for use in the USA, from Moderna and Johnson & Johnson, have not been available to minors because studies are still underway.

“Today’s action allows for a younger population to be protected from COVID-19, bringing us closer to returning to a sense of normalcy and to ending the pandemic,” acting FDA Commissioner Janet Woodcock said in a statement Monday. “Parents and guardians can rest assured that the agency undertook a rigorous and thorough review of all available data, as we have with all of our COVID-19 vaccine emergency use authorizations.”

Although rare, adolescents can get seriously ill from COVID-19, and they can spread it to others. “So my hope is that if the vaccine is authorized, parents will take advantage of it and get their kids vaccinated,” Biden said.

From March 1, 2020, to April 30, 2021, about 1.5 million adolescents, ages 11-17, were diagnosed with COVID-19, according to the Centers for Disease Control and Prevention.