Mix and Match COVID-19 Booster: Which Shot Should You Get?

covid vaccine booster infographic

November 30, 2021

Clinical Contributors to this story:
Thomas Bader, M.D.
Dr. Jerry Zuckerman, M.D.

As more and more Americans become eligible to receive the Covid-19 booster, you will be faced with a choice: Which COVID-19 booster should you receive? 

The U.S. Food & Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC) have given green light to safely mix and match the booster shot, which means you may choose which COVID-19 vaccine you receive as a booster. Is it better to stick to the same kind of vaccine you originally received, or are there situations where you should consider getting a different COVID-19 vaccine as a booster?

We connected with Hackensack Meridian Health’s Thomas Bader, M.D., chief clinical officer and Jerry Zuckerman, M.D., vice president of infection prevention and control, to understand when you should consider the mix and match approach and when it doesn’t make sense. 

Pfizer or Moderna (mRNA) vaccine recipients

If you have received the Pfizer or Moderna vaccine for the first two shots and you meet the booster eligibility criteria, you can receive the COVID-19 booster shot. 

The recipients of the Pfizer and Moderna vaccines have a choice to mix and match, but Dr. Bader is encouraging people to stay with the same vaccine as the initial dose. “If you have already received the mRNA vaccine, there is no strong reason and benefit to mix and match," he says. “If it’s not easy to get the same vaccine you previously had, mixing and matching won’t hurt. What’s most important is that you go out and get the booster shot.”

Johnson and Johnson vaccine recipients 

Anyone 18 years or older who has received one dose of Johnson and Johnson (J&J) vaccine, and it’s been at least 2 months since your shot, is now allowed to receive the COVID-19 booster shot. 

The recipients of the J&J vaccine also have a choice to mix and match or get a second J&J dose as a booster. Dr Bader is recommending that people who got the J&J vaccine consider Pfizer or Moderna (either mRNA vaccine) for their booster as it is expected to produce higher levels of antibodies. 

A study by The National Institutes of Health (NIH) found that people who received the J&J vaccine produced higher antibody levels after they got the Moderna or Pfizer booster, compared to J&J. 

“Other than an allergy to an mRNA vaccine component, I can't think of any reason why a J&J recipient wouldn't get a Pfizer or Moderna booster,” says Dr. Bader.

Why is it important to get a COVID-19 booster? 

“As cold weather and the holiday season approaches, boosters become more important, especially for older adults and those with underlying medical conditions that put them at higher risk,” says Dr. Zuckerman.

Levels of antibodies start to decline eventually after people receive the COVID-19 vaccine, weakening your protection against COVID-19. By getting a booster shot you are increasing your immunity against the virus. Boosters help prevent severe illness or death, particularly amongst older adults and people with pre-existing medical conditions.



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