F.D.A. Panel Meeting for Discussion If Next Generation Vaccines Should Target Omicron

An independent panel of advisers to the Food and Drug Administration is meeting on Tuesday as the members consider options for updating the coronavirus vaccines for a booster campaign aimed at warding off fall or winter surges.

The experts will vote at the end of the daylong meeting on whether the vaccines should be reformulated to target Omicron or its subvariants. You can watch the meeting live on YouTube here.

Discussion questions circulated by the F.D.A. show that the advisory group will also be asked whether vaccines that combine the original formulation with one targeting Omicron would be preferable to vaccines that only target Omicron. Data supporting the option that combines the so-called “prototype,” or existing, vaccines with Omicron has received mixed reviews so far, with regulators suggesting in briefing materials for Tuesday’s meeting that such a design is “already somewhat outdated.”

Dr. Peter Marks, who oversees the F.D.A.’s vaccines office, said at the beginning of Tuesday’s meeting that a good match between a vaccine and variant could lead to greater vaccine effectiveness and durability. He said that the Omicron subvariants known as BA.4 and BA.5, which had made up more than a third of cases in the country, were “poised to become the dominant variant,” a hint of where regulators may look in choosing a new composition for coronavirus shots.

Dr. Marks displayed a timeline suggesting that regulators would decide on a new vaccine’s makeup by early July, and that a fall booster campaign with a newly designed shot could begin in October. Manufacturers of so-called mRNA vaccines, made by Moderna and Pfizer-BioNTech, require roughly three months to begin producing doses with a new composition, Dr. Marks said.

Regulators are also planning to ask the advisers whether health providers should continue using the original vaccine formulation this fall on people who have not yet been fully vaccinated if the makeup of the booster changes.

Members of the F.D.A. committee may be divided on who should receive new vaccines. Some might say that a fall booster will be broadly necessary, while others might argue that because the current vaccines’ protection against severe forms of Covid-19 has held, the next round of shots should be limited to high-risk individuals, at least to start. Dr. Paul Offit, a vaccine expert at Children’s Hospital of Philadelphia and a member of the committee, has said that only people over 70, and those over 50 with serious underlying conditions, will likely need a fall booster.

Heather Scobie, a Centers for Disease Control and Prevention epidemiologist, presented data at Tuesday’s meeting showing that Americans 70 and older had been hospitalized in recent months at substantially higher rates than other age groups. She said that second boosters are reducing the risk of death in older adults but described uptake as “rather poor.”

The possibility of a more advanced vaccine has been teased for months by federal health officials, who have warned that as the virus evolves rapidly, vaccine-induced protection against infection has faded, allowing some Americans to be reinfected even in the span of several months.

In the briefing materials published ahead of Tuesday’s meeting, F.D.A. officials said the risk of another major outbreak will rise later this year “due to the combination of waning immunity, further evolution of variants, and increased indoor activity.”

The World Health Organization said this month that updated versions of the vaccines should be studied because their protection against symptomatic illness has deteriorated so quickly.

Moderna and Pfizer, the makers of the two most widely-used vaccines in the United States, have both studied Omicron-specific vaccines, expecting them to be seriously considered as the fall booster option. But the research has been complicated by the subvariants, for which neither company has developed shots yet.

If the government decides it wants a booster that targets BA.4 and BA.5, the vaccine manufacturers will have to race to produce the doses by fall. Pfizer may be able to meet an October deadline, according to people familiar with the company’s operations, while Moderna has said it likely would not have the option ready until late this year or early next year.

Deaths have remained below 400 a day in recent weeks even as Omicron cases surged this spring, with people dying from Covid at a rate close to the lowest of the pandemic. Infectious disease experts have attributed the trend to the protection Americans have gained from vaccination and infection, and from new treatments, such as the oral antiviral pill Paxlovid.

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