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U.S. health authorities again expanded the nation's booster campaign Thursday, opening extra doses of Pfizer’s COVID-19 vaccine to several million 16- and 17-year-olds.

The U.S. and many other nations already were urging adults to get booster shots to pump up immunity that can wane months after vaccination, calls that intensified with the discovery of the worrisome 

On Thursday, the Food and Drug Administration gave emergency authorization for 16- and 17-year-olds to get a third dose of the vaccine made by Pfizer and its partner BioNTech — once they're six months past their last dose. And hours later, the Centers for Disease Control and Prevention lifted the last barrier as Dr. Rochelle Walensky, the agency's director, issued a statement strongly encouraging those teens to get their booster as soon as it's time.

Boosters are important considering that protection against infection wanes over time and “we’re facing a variant that has the potential to require more immunity to be protected," 

In Minnesota, Gov. Tim Walz said in a statement that 16- and 17-year-olds who finished their Pfizer vaccine series at least six months ago should get their Pfizer booster shot. While officials allow "mixing and matching" of boosters for adults, Walz said, that does not apply for 16- and 17-year-olds as Pfizer remains the only COVID-19 vaccine authorized for this age group. 

And more booster questions, answered

About 200 million Americans are fully vaccinated, including about 4.7 million 16- and 17-year-olds, many of whom got their first shots in the spring and would be eligible for a booster.

“Vaccination and getting a booster when eligible, along with other preventive measures like masking and avoiding large crowds and poorly ventilated spaces, remain our most effective methods for fighting COVID-19,” Dr. Janet Woodcock, acting FDA commissioner, said in a statement.

The Pfizer vaccine is the only option in the U.S. for anyone younger than 18, either for initial vaccination or for use as a booster. It’s not yet clear if or when teens younger than 16 might need a third Pfizer dose. But Walensky said the CDC and FDA would closely watch data on 12- to 15-year-olds because if they eventually need boosters, “we again will want to act swiftly.”

Vaccinations for children as young as 5 just began last month, using special low-dose Pfizer shots. By this week, about 5 million 5- to 11-year-olds had gotten a first dose.

The extra-contagious delta variant is causing nearly all COVID-19 infections in the U.S., and in much of the world. It’s not yet clear how vaccines will hold up against the 

new and markedly different omicron mutant. 

But there’s strong evidence that boosters offer a jump in protection against delta-caused infections, currently the biggest threat.

“The booster vaccination increases the level of immunity and dramatically improves protection against COVID-19 in all age groups studied so far,” BioNTech CEO Ugur Sahin said in a statement.

Complicating the decision to extend boosters to 16- and 17-year-olds is that the Pfizer shot — and a similar vaccine made by Moderna — have been linked to a rare side effect. Called myocarditis, it’s a type of heart inflammation seen mostly in younger men and teen boys.

The FDA said rising COVID-19 cases in the U.S. mean the benefits of boosters greatly outweighed the potential risk from the rare side effect, especially as the coronavirus itself can cause more serious heart inflammation.

Health officials in Israel, which already gives boosters to teens, have said the side effect continues to be rare with third doses.

A U.S. study this week offered additional reassurance. Researchers from children’s hospitals around the country checked medical records and found the rare side effect usually is mild and people recover quickly. The research was published Monday in the journal Circulation.

Health

COVID-19

The Associated Press

Author

MPR News Staff

U.S. health authorities again expanded the nation's booster campaign Thursday, opening extra doses of Pfizer’s COVID-19 vaccine to several million 16- and 17-year-olds.


U.S. expands Pfizer COVID boosters, opens extra dose to age 16

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