Should those who had the J&J coronavirus vaccine try to get a booster dose of Pfizer or Moderna?

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Mon, 2021-07-05 11:32 — mike kraft

You had the Johnson & Johnson coronavirus vaccine. Should you try to get a booster dose of Pfizer or Moderna? As the delta variant spreads, people who had the Johnson & Johnson vaccine may be seeking a dose of an mRNA vaccine. Here's what experts told The Washington Post about combining those vaccines. Ben Guarino, Allyson Chiu Washington Post

Two weeks ago, virologist Angela Rasmussen received a dose of the Pfizer-BioNTech coronavirus vaccine to boost her immune system, which was already primed by a Johnson & Johnson shot.

No U.S. health agency has recommended this vaccine combo. And Rasmussen, a research scientist at the University of Saskatchewan’s Vaccine and Infectious Disease Organization in Canada, remains confident in data that show one J&J dose will prevent her from getting hospitalized with covid-19, the illness caused by the virus.

But she was concerned about a rare post-vaccination breakthrough infection — though not because she worried it would make her sick. Instead, if she were exposed and her immune system did not roundly defeat the infection, she feared any surviving pathogens may have the opportunity to evolve into more resistant strains. The emergence of the delta variant, a version of the coronavirus that more easily spreads from person to person, troubled Rasmussen. The Pfizer shot, she said, could reinforce her protection against that variant or help stop her from spreading it.

Rasmussen received one of the 12 million doses of the Johnson & Johnson vaccine administered in the United States so far. Meanwhile, 130 million Moderna and 175 million Pfizer shots had been administered to people in the United States by mid-June, according to the Centers for Disease Control and Prevention. Numerous studies have shown that the Pfizer and Moderna vaccines, which belong to a class of vaccines that use molecules called mRNA, are effective against delta and other variants. Fewer studies address J&J’s strength against variants.

Because more scientific reports involve mRNA vaccines rather than J&J vaccines, Rasmussen said she thinks people who received the J&J shot “are feeling left behind.” Some of those people may be wondering whether they, too, need boosters.

“I’m a virologist who works at a vaccine research institute, so I didn’t feel that I needed to discuss anything with the person who administered my vaccine shot,” Rasmussen said. “I made a professional evaluation of my own situation.”

The average J&J recipient has neither her expertise nor her access. Many U.S. vaccine and infectious-disease specialists who spoke with The Washington Post cautioned against attempts to find boosters unless supporting data or an official recommendation emerge. Members of the public vaccinated with J&J, they argued, should not independently seek out extra doses. Here are three main questions to consider.

Is it necessary to combine the Johnson vaccine with another vaccine?
Is it safe to boost the Johnson vaccine with an mRNA dose?
Is it even possible to access a second shot if you’ve already had a Johnson dose?
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