美国国家公共电台 NPR--Summer boosters for people under 50 shelved in favor of updated boosters in the fall

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Summer boosters for people under 50 shelved in favor of updated boosters in the fall

Transcript¹

The Food and Drug Administration is shelving plans to let more younger adults get second COVID-19 boosters this summer. Instead, officials are planning to speed up availability of the next generation of boosters in the fall, three administration officials confirmed to NPR.

The new strategy came after a debate within the administration about trying to balance protecting people this summer with keeping people safe next winter, when the country will probably get hit by yet another surge, according to the officials familiar with the discussion.

Some officials wanted to launch a new booster campaign this summer to encourage more people to get boosted and more boosted people to get double-boosted to protect them against the highly contagious² BA.5 subvariant driving a surge this summer.

But others worried that would interfere³ with a booster campaign in the fall with what will hopefully be a superior booster specifically targeting BA.5.

One concern was that giving two boosters so close together could increase the risk for a rare heart inflammation called myocarditis. Another concern was that giving them so close together could blunt the protection from the second booster.

There was also fear two booster campaigns too close together would increase the vaccine⁴ fatigue⁵ already making it hard to convince people to get boosters.

The dilemma⁶ facing the administration is that the immunity⁷ many people have gotten from getting vaccinated⁸ or infected has been wearing off. At the same time, the most contagious version of the virus to emerge yet — the omicron subvariant BA.5 — is making people even more vulnerable.

So as COVID is starting to become more serious than a cold or flu again, most people younger than age 50 aren't eligible⁹ for second boosters to protect themselves.

In response, the FDA was considering opening up eligibility¹⁰ for second boosters for all adults. But then the concerns arose that letting more people get boosted with the original vaccine now could interfere with plans to boost them with the updated, hopefully more protective vaccines¹¹ in the fall. The hope is those boosters will blunt the toll¹² of what could be a worse winter surge.

Moderna and Pfizer-BioNTech were already scrambling¹³ to comply with the FDA's request to get new, "bivalent" boosters ready by October or November that target both the original strain of the virus and omicron subvariants BA.4 and BA.5.

But the FDA received assurances from the companies they could deliver the new boosters even sooner — in September, according to a federal official familiar with the situation who is not authorized¹⁴ to talk about it publicly. The hope is to make the new boosters available to those 12 and older in early September, and children after that.

The possibility of the shift provoked mixed reactions earlier this week.

Some think it is the smartest strategy. Three shots are still protecting most younger, otherwise healthy people against serious illness, they say. And boosting people again now, and then so soon again in the fall, could confuse people, potentially eroding¹⁵ their willingness to get any boosters, according to some experts.

"I think this will increase trust," Dr. Monica Gandhi, a professor of medicine at the University of California, San Francisco, wrote in an email to NPR. "We can't give a booster now and then again in 1.5 months or two months – that will decrease trust."

And giving two shots too close together could actually backfire from a health perspective, according to some experts.

"I think this is the right call," Dr. Celine Gounder, a senior fellow at the Kaiser Family Foundation, said during an interview with NPR. "If you get a booster now with the original formulation of the vaccine, this may in fact be counter-productive. It may prevent the second booster dose given this fall from taking and from you developing an immune response to that booster."

But others aren't so sure. They say the new vaccines may not be significantly better.

"People should not regard them as some sort of magic bullet that gives them super-strong protection," says Dr. John Moore, an immunologist at Weill Cornell Medicine. "These are not going to be magic bullet game-changers because they're not that much better than the already available vaccine boosters."

It's also unclear whether the new boosters can be ready by September. And who knows if BA.5 will even been the main virus by the fall and winter?

"I don't see the benefit waiting for a BA.5-specific booster since BA.5 may be in the rearview mirror and well past us by the time that's available," says Dr. Peter Hotez, dean of the Baylor College of Medicine National School of Tropical Medicine.

People younger than 50 should at least have the option to protect themselves now, especially with BA.5 already surging, some say.

"You're talking about you know literally¹⁶ hundreds of millions of people who are at a higher risk than they need to be for months," says Dr. Robert Wachter, chair of the department of medicine at the University of California, San Francisco.

"And that will mean potentially millions of preventable infections, certainly thousands of preventable hospitalizations, and probably hundreds of preventable deaths."