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CDC panel unanimously endorses Pfizer and Moderna Covid boosters for all U.S. adults

A patient receives a Covid-19 vaccine booster shot at a Pfizer-BioNTech vaccination clinic in Southfield, Michigan, on Sept. 29, 2021.

Emily Elconin | Reuters

The CDC’s independent panel of vaccine scientists unanimously endorsed Pfizer and Moderna’s boosters for all adults, one of the final regulatory steps before the U.S. can officially start distributing the doses.

The Advisory Committee on Immunization Practices voted to recommend the shots. The Food and Drug Administration authorized both company’s vaccine boosters for everyone 18 and over earlier on Friday, and CDC Director Rochelle Walensky is expected to clear the doses soon after.

The panel’s recommendation would open up eligibility to everyone 18 and over in the U.S., but the group more strongly endorsed shots for older Americans by saying everyone 50 and over should get a booster. It previously said people over 65 and some other high-risk people should get a third shot.

Once Walensky signs off, tens of millions of Americans who’ve received their two initial shots at least six months ago will be eligible to get a third shot as soon as early as this weekend.

“As a clinician deep in the clinical trenches, I am really glad that we have clarity and streamlining of the recommendation so that all Americans can understand the vaccines that are recommended for them at this time,” committee member Dr. Camille Kotton said after the vote.

Efficacy data

Pfizer said its booster dose was 95% effective at preventing symptomatic infection in people who had no evidence of prior infection in a clinical trial of 10,000 participants 16 years and older, according to Dr. John Perez, vice president of the company’s vaccine clinical research program. Moderna didn’t submit its efficacy data for its booster, telling the panel it was still gathering the data.

While more than 195 million people are fully vaccinated in the US., Covid cases are rising in some areas as the effectiveness of the vaccines falls over time, the CDC’s Dr. Sara Oliver told the panel.

“Overall protection remains high for severe disease and hospitalization and waning (effectiveness) appears to be less pronounced for the Moderna vaccine compared to Pfizer,” Oliver said. However, she said evidence suggests there is a higher risk for a rare heart condition called myocarditis following Moderna’s shots compared with Pfizer.

Providing clarity

Myocarditis update

The CDC advisory panel originally declined in September to endorse Pfizer’s boosters for the broader public, supporting instead a scaled back distribution plan for elderly Americans and people who face a high risk from Covid infection due to underlying health conditions.

At that time, experts on the panel said available safety data, based on research from 306 individuals who received boosters, was too limited to make a determination about the risks posed by rare side effects such as myocarditis.

The panel endorsed Moderna’s boosters for elderly Americans and people with underlying health conditions in October as well as Johnson & Johnson boosters for everyone age 18 and over.

Booster controversy

Broadly administering booster doses is a controversial topic in public health. The World Health Organization has repeatedly criticized wealthy nations for rolling out third shots at a time when people in poorer nations have very limited access to vaccines.

Booster doses have also been somewhat contentious in the U.S., with some experts questioning whether now is the time to start rolling out third shots when more than 60 million Americans still haven’t received their first dose.

However, state officials from California to Maine had already started rolling out boosters for all adults before the CDC’s recommendation on Friday.

Many vaccinated Americans want an extra layer of protection as data increasingly shows that vaccine effectiveness against infection declines overtime. Public health experts expect an increase in infection as Americans head indoors to escape the winter cold and gather with families over the holidays.

Booster doses could help reduce transmission by helping to prevent breakthrough infections in people who are already vaccinated.

Read More: CDC panel unanimously endorses Pfizer and Moderna Covid boosters for all U.S. adults

2021-11-19 15:22:08

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