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Sunday August 14th, 2022 8:08PM

Marathon US hearings to decide fate of COVID shots for tots

By The Associated Press
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Parents anxious to finally vaccinate their youngest children against COVID-19, strap in: A lot is set to happen over the next week.

On Wednesday, both Moderna and Pfizer will have to convince what’s essentially a science court -- advisers to the Food and Drug Administration -- that their shots work well in babies, toddlers and preschoolers.

The FDA weighed in late Friday with its own analysis, finding the shots appear safe and effective for children as young as 6 months old. A federal review of Pfizer’s vaccine for the littlest kids is expected by Monday.

Kids under 5 are the only group not yet eligible for COVID-19 vaccination in the U.S. If the FDA's advisers endorse one or both shots for them -- and the FDA agrees -- there’s still another hurdle. The Centers for Disease Control and Prevention must recommend whether all tots need immunization or just those at high risk from the virus.

Adding to the complexity, each company is offering different dose sizes and number of shots. And the week won’t even start with the littlest kid debate: Moderna first will ask FDA’s advisers to support its vaccine for older children.

Only a handful of countries, including China and Cuba, have offered different types of COVID-19 vaccinations to children younger than 5.

Here’s a primer to help keep all the developments straight.

PFIZER’S PLAN FOR THE LITTLEST

Pfizer has a pediatric track record -- its COVID-19 vaccine is the only type the FDA allows for children of any age. Two doses plus a booster are cleared for everyone 5 and older. Shots for the 5- to 11-year-olds contain a third of the dose given to teens and adults.

For kids younger than 5, Pfizer and its partner BioNTech lowered the dose even more, to a tenth of the adult dose. The trade-off is a need for three shots, the first two given three weeks apart and the last at least two months later.

MODERNA’S PLAN FOR THE LITTLEST

Moderna is seeking FDA clearance for two shots, each a quarter of its adult dose, given about four weeks apart for kids younger than 6. (Moderna tested a slightly different age limit than Pfizer.)

The FDA currently allows Moderna’s vaccine to be used only in adults. But some countries allow two full-size doses for teens and half-size shots for kids ages 6 to 11 — which Moderna also hopes to offer in the U.S.

MAKING THEIR CASE

Pfizer disappointed parents back in December when a study found two shots weren’t quite strong enough. So researchers tested a third shot in youngsters age 6 months through 4 years during the winter surge of the omicron variant.

Pfizer’s preliminary data showed after three shots, children developed high levels of virus-fighting antibodies with no safety problems. In addition, the vaccine appeared 80% effective in preventing symptomatic COVID-19. But that calculation was based on just 10 cases diagnosed among study participants by the end of April, and it could change if more cases have occurred since.

Moderna’s study found tots ages 6 months through 5 years developed high antibody levels after two of its shots. But while there were no severe cases of COVID-19 during the trial, the vaccine was only about 40% to 50% effective at preventing milder infections.

In their review, FDA scientists noted the study was too short to determine how long the vaccine's effectiveness would last. They also said that it was likely that a booster would be needed, based on the experience with adults.

Moderna recently added a booster dose to the tot study — and disclosed in a presentation for Wednesday's meeting that it also plans to allow participants a chance to help test an omicron-targeting booster.

WHEN COULD SHOTS START?

If the FDA authorizes one or both shots — a decision expected shortly after its advisory panel's meeting — all eyes move to the CDC. That agency recommends how to use vaccines. Which tots should get COVID-19 vaccination will be an important debate as the coronavirus doesn't tend to make children as sick as adults yet nearly 500 deaths in U.S. children under 5 have been reported.

The CDC’s own vaccine advisers are scheduled to meet next Friday and Saturday, and a final decision by the CDC's director, Dr. Rochelle Walensky, should come shortly after they're done.

If all those steps fall into place, vaccinations could begin in many areas June 21.

VACCINATION SITES

Pediatricians, other primary care physicians and children's hospitals are expected to vaccinate most of the youngest kids. Limited drugstores will offer them for at least some of the under-5 group — parents should check local availability for different ages. The Biden administration says it also is working with a variety of other groups, such as children's museums, to offer pop-up clinics and reach even more youngsters.

WHAT IF MY CHILD RECENTLY HAD COVID-19?

About three-quarters of children of all ages are estimated to have been infected at some point during the pandemic. It’s a question sure to come up as CDC’s advisers make recommendations for the littlest kids, so stay tuned.

For older ages, the CDC has recommended vaccination anyway to lower the chances of reinfection. There’s no firm guidance on how long to wait; the CDC has said people may wait as long as three months.

DEMAND IS UNCLEAR

There are roughly 18 million children younger than 5, and many parents are eager to get their tots vaccinated. But it’s unclear how many ultimately will, given disappointing vaccine uptake by older children.

According to the CDC, just 29% of kids ages 5 to 11 have gotten two doses, and about 60% of 12- to 17-year-olds.

WHAT ABOUT MODERNA AND OLDER KIDS?

On Tuesday, the FDA’s advisers will consider Moderna shots for older kids, those 6 to 17 -- a decision that might alleviate some parent confusion. The FDA review released Friday also included an analysis of the company’s shots for that age group.

The FDA has held up Moderna’s teen vaccine for months while it investigated a rare side effect, heart inflammation. That’s mostly a risk for teen boys and young men, and also can occur with the Pfizer vaccine. The FDA review said its latest analysis of reports of myocarditis both in the U.S. and in other countries did not find conclusive evidence of a difference in risk between the Moderna and Pfizer vaccines.

___

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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