HomeHealthCOVID-19 booster shots in the US: 8 important things to know

COVID-19 booster shots in the US: 8 important things to know

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Health officials are recommending US adults get a booster shot starting this fall.

Sarah Tew/CNET

For the most up-to-date news and information about the coronavirus pandemic, visit the WHO and CDC websites.

Though the plan for COVID-19 booster shots still needs to be approved by the US Food and Drug Administration, those third jabs are coming. And they’re not just for people with compromised immune systems. On Wednesday, the Biden administration announced it was recommending that adults fully vaccinated with the two-dose Pfizer or Moderna vaccine get a third shot as a booster. The shots will start to be made available next month

The booster will provide added protection to the fully vaccinated as the COVID-19 delta variant surges across the country. The plan comes as research shows that the effectiveness of the vaccines can decline. “Recent data makes clear that protection against mild and moderate disease has decreased over time,” US Surgeon General Vivek Murthy said Wednesday. “This is likely due to both waning immunity and the strength of the widespread delta variant.”

The White House plan would allow for the booster shot eight months after receiving the second dose of the Pfizer or Moderna vaccine. The need for a booster shot for the one-dose Johnson & Johnson vaccine is also likely, though a plan hasn’t yet been made. Murthy says those who were vaccinated early on will be eligible for the booster first, and priority will go to those most vulnerable, including health care workers, nursing home residents and seniors.

What does all this mean in the US? Read on for what we know about COVID-19 booster shots today, including why they’re needed, how they relate to breakthrough infections, and what the controversy has been surrounding third shots. We’ll be updating this as new information is released.

Who will qualify for the COVID-19 booster shot and when?

On Wednesday, health officials with the Biden administration recommended an additional shot for American adults 18 and over who are fully vaccinated with the Pfizer or Moderna shots. The guidance follows reports from Israel that the protection the Pfizer vaccine provides may start to decrease after eight months. 

However, the booster plan still needs to be evaluated and approved by the FDA, which will review the safety and effectiveness of a third dose of the Pfizer and Moderna mRNA vaccines. The plan is also pending recommendation by the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices.

The administration is recommending a booster shot eight months after becoming fully vaccinated. So, for those who received their shots in January and February, that could be as early as mid-September. The booster vaccines are expected to be available the week of Sept. 20. 

“We believe that that third dose will ultimately be needed to provide the fullest and continual extent of protection that we think people need from the virus,” Murthy said Wednesday. “Our plan is to stay ahead of this virus by being prepared to offer COVID-19 booster shots to fully vaccinated adults 18 years and older.” Murthy said the FDA will evaluate booster shots for those younger than 18 years of age, and the administration will follow FDA recommendations for minors.

What about a Johnson & Johnson booster shot?

Administration officials said they expect those who received the one-dose Johnson & Johnson vaccine will also need another jab, but since it didn’t receive approval (and thus start being administered) until March, more research is necessary. “We expect more data on J&J in the coming weeks,” Murthy said. “With that data in hand, we will keep the public informed with the timely plan for J&J booster shots.”

Will the booster shots be free and readily available?

The current one-dose vaccine shot from Johnson & Johnson and two-dose vaccines from Moderna and Pfizer are free to anyone who wants to get vaccinated. And the additional shots will be free too. “These booster shots are free,” Biden said on Wednesday. “It will be easy. Just show your vaccination card and you’ll get a booster. No other ID. No insurance. No state registry requirements.”

“It will be just as easy and convenient to get a booster shot as it is to get a first shot today. We have enough vaccine supply for every American,” said White House COVID-19 response coordinator Jeff Zients, adding that those who are eligible will be able to get a booster at roughly 80,000 places across the country, including over 40,000 local pharmacies. Zients said 90% of Americans have a vaccine site within five miles of where they live.

What about those eligible for booster shots now?

Some people who already are eligible under guidelines from the CDC can now go out and get their third dose of a COVID-19 vaccine. The list of immunocompromised people who can get a third shot includes solid organ transplant recipients or people who have an “equivalent level of immunocompromise” and who have a reduced ability to fight off infections, making them more vulnerable to the coronavirus. Booster authorization hasn’t yet been expanded more broadly to those with other chronic medical conditions.

The current CDC recommendation is for an additional dose of the two-shot vaccine for certain immunocompromised people, which is a small group. Within that category, the recommendation is for those 18 and older for the Moderna vaccine, and 12 and older for the Pfizer vaccine. The FDA didn’t authorize an additional dose of the Johnson & Johnson vaccine, and because of a lack of data at this time, the CDC doesn’t recommend a second dose for immunocompromised people who got the one-shot vaccine.

About 3% of US adults are immunocompromised, according to the CDC, but research suggests they account for about 44% of hospitalized breakthrough cases of COVID-19. Not only are they more likely to get very ill from COVID-19, they also have a lower antibody response to vaccines and are at a higher risk of transmitting the virus. 

Those with other conditions, like diabetes and heart disease, aren’t advised to get a booster, at least for now. Here’s a list of people the CDC recommends get an extra dose if they got the Pfizer or Moderna vaccine: 

  • Those with advanced or untreated HIV infection.
  • Cancer patients and transplant recipients who are taking certain immunosuppressive drugs.
  • Those receiving active cancer treatment for tumors or cancers of the blood.
  • Those with moderate or severe primary immunodeficiency. 
  • Patients being treated with high-dose corticosteroids or other drugs that may suppress immune response. 
  • People who received a stem cell transplant within the last two years and are taking certain drugs. The CDC says to talk to your medical provider about your health condition and whether a third shot is appropriate. 

If you’re unsure whether you’re qualified, the CDC says to talk to your medical provider about your health condition and whether a third dose is appropriate. 

What’s behind the need for COVID-19 booster shots?

“The COVID-19 vaccines that are authorized in the United States have been remarkably effective, even against the widespread delta variant. But we know that even highly effective vaccines become less effective over time,” Murthy said. 

Calling the eradication of the COVID-19 virus “unlikely,” a UK scientific advisory group found (PDF) that there’s a “realistic possibility” that a variant will emerge that is resistant to the current battery of vaccines. Governments, public health organizations and vaccine makers are all tracking developments in coronavirus variants like delta and lambda, hoping to determine if booster shots targeting new variants will be needed among the general population.

What’s the relationship to COVID ‘breakthrough cases’? 

As of July, in the US, “breakthrough” coronavirus cases caused by the dominant delta variant amount to less than 1% of people who are fully vaccinated. Both the Moderna and Pfizer vaccines have proved to be more than 90% effective against hospitalizations and death. Nonetheless, a CDC study shows that vaccinated people can both contract the highly contagious delta variant and spread it. According to a widely reported internal CDC memo, the delta variant spreads as easily as chicken pox, which is considered more contagious than the flu but less contagious than measles

The surge in new COVID-19 cases is primarily affecting unvaccinated people and causing community spread, and in turn, prompting the return of mask mandates and guidance in hard-hit areas, even for people who have full vaccine protection. The debate over mask use and vaccine boosters underscores how scientists and other health experts continue to grapple with the uncertainties of COVID-19.

According to Murthy, “We are concerned that this pattern of decline we are seeing will continue in the months ahead, which could lead to reduced protection against severe disease, hospitalization and death.”

Biden press conference

The Biden administration says booster shots would be free.

Screenshot by Corinne Reichert/CNET

What’s the global controversy over booster shots?

Israel is now administering third doses of the vaccine to those 50 and older, and the UK has similar plans for September. However, this is resulting in a backlash among countries that are struggling to deliver first and second shots to residents. 

World Health Organization Director-General Tedros Adhanom Ghebreyesus called for a “moratorium” on booster shots in high-income countries, citing the global disparity in vaccine distribution. Of the 4 billion doses administered globally, 80% have gone to high- and upper-middle income countries that make up less than half the world’s population, he said. 

“We cannot accept countries that have already used most of the global supply of vaccines using even more of it, while the world’s most vulnerable people remain unprotected. We call on vaccine producers to prioritize Covax,” Tedros said, referring to the world’s COVID-19 vaccine distribution program.

White House Press Secretary Jen Psaki said on Aug. 17 that the US will have enough vaccines to both provide boosters for those who are fully vaccinated in the US and meet the global demand. “We have long planned from enough supply,” she said

The US has so far shipped 115 million vaccine doses to 80 different countries, Zients said Wednesday. “Our wartime efforts will continue doing everything we can to get even more people vaccinated both here at home and around the world. We can and must do both at the same time because that’s what it’s going to take to end this pandemic,” he said.

Is it OK to mix and match COVID-19 vaccines?

According to The New York Times, administration officials will recommend people get a booster of the same vaccine they originally received. The CDC now says a third dose of a different vaccine brand is permitted if a dose of the same type isn’t available.

Other global health agencies and countries are testing administered vaccines from two different manufacturers. In the UK, for example, a recent study found that those who received a first dose of the AstraZeneca vaccine and a second of Pfizer had a higher immune response than those who received two doses of the AstraZeneca vaccine.

While we watch how the situation develops, here’s what we know about the delta variant and info on whether you need to continue to wear a mask.

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.


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