The FDA and CDC say it's OK to mix and match COVID-19 vaccines and booster shots, and in some cases it's preferred.
Scientists are trying to decide who should be eligible for COVID-19 booster shots, but they’re missing key data that would help them.
These reassuring findings led Dr. Rochelle Walensky, the CDC director, to leave the choice in patients’ hands. The new study includes three groups of 150 fully immunized people — one that got the Pfizer-BioNTech vaccine, one that got the Moderna vaccine, and one that got the Johnson & Johnson shot. Researchers took each group and further divided it into three arms, with 50 people in each. Participants in one arm of each group got boosted with the same product they had originally gotten.
With regard to the Johnson & Johnson vaccine in particular, the data suggest that those who got an initial J&J shot saw their antibody levels rise a bit more after 15 days if they were boosted with the Pfizer-BioNTech or Moderna vaccine than if they got a second dose of J&J.
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