Zürcher Nachrichten - US panel recommends Covid vaccine for youngest children

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US panel recommends Covid vaccine for youngest children
US panel recommends Covid vaccine for youngest children / Photo: Frederic J. BROWN - AFP/File

US panel recommends Covid vaccine for youngest children

After months of waiting for anxious parents, a panel of experts convened by the US Food and Drug Administration recommended Moderna's Covid vaccine Wednesday for the nation's youngest children.

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The panelists are now expected to vote soon in favor of also greenlighting the Pfizer vaccine. Formal authorizations should follow quickly, with the first shots in arms expected by next week.

"This recommendation does fill a significant unmet need for a really ignored younger population," said Michael Nelson, a professor of medicine at the University of Virginia and one of the 21 experts who unanimously said the benefits of the Moderna vaccine outweighed the risks.

Children under five are the only age group not yet eligible for Covid immunization in the United States and most countries. The FDA offers livestreams of its internal deliberations and its stamp of approval is considered the global gold standard.

Opening the meeting, senior FDA scientist Peter Marks said that despite studies showing the majority of children have now been infected with the coronavirus, the high rate of hospitalizations among infants, toddlers and young children during last winter's Omicron wave underscored the urgent need for vaccination.

"We are dealing with an issue where we have to be careful we don't become numb to the pediatric deaths because of the overwhelming number of older deaths," he said. "Every life is important and vaccine-preventable deaths are something we would like to try to do something about."

The United States has recorded 480 Covid-19 deaths in the 0-4 age group so far in the pandemic, according to latest official data -- far higher than even a "terrible flu season," Marks said.

As of May 2022, there have been 45,000 hospitalizations in that group, nearly a quarter of which required intensive care.

Ahead of the meeting, the FDA posted its independent analyses of the pharmaceutical companies' vaccines, deeming both safe and effective.

Both vaccines are based on messenger RNA, which delivers genetic code for the coronavirus spike protein to human cells that then grow it on their surface, training the immune system to be ready for when it encounters the real virus. The technology is now considered the leading Covid vaccination platform.

Pfizer is seeking authorization for three doses at three micrograms given to children aged six months through four years, while Moderna asked for the FDA to authorize its vaccine as two doses of a higher 25 micrograms for ages six months through five years.

Both vaccines were tested in trials of thousands of children. They were found to cause similar levels of mild side effects as in older age groups and triggered similar levels of antibodies.

- High protection against severe disease -

Efficacy against infection was higher for Pfizer, with the company placing it at 80 percent, compared to Moderna's estimates of 51 percent for children aged six-months to two years old and 37 percent for those aged two to five years.

But the Pfizer figure is based on very few cases and is thus considered preliminary. It also takes three doses to achieve its protection, with the third shot given eight weeks after the second, which is given three weeks after the first.

Moderna's vaccine should provide strong protection against severe disease after two doses, given four weeks apart, and the company is studying adding a booster that would raise efficacy levels against mild disease.

However, Moderna's decision to go with a higher dose is associated with higher levels of fevers in reaction to the vaccine compared to Pfizer.

There are some 20 million US children aged four years and under.

Although obesity, neurological disorders and asthma are associated with increased risk of severe disease among young children, it's not easy to predict severe outcomes.

In fact, 64 percent of hospitalizations in those under five occurred in patients without comorbidities.

Children can also go on to contract multisystem inflammatory syndrome in children (MIS-C), a rare but serious post-viral condition. Some three to six percent can experience long Covid symptoms for more than 12 weeks.

If the FDA-appointed experts recommend the two vaccines, then the matter will go to another committee convened by the Centers for Disease Control and Prevention for a final say.

White House officials last week said the rollout of 10 million shots at pharmacies and doctors' offices could begin as soon as June 21.

O.Hofer--NZN