Preliminary results of a U.S. study published Wednesday showed that people who received a single dose of Johnson & Johnson's COVID-19 vaccine may benefit from a booster of the Pfizer or Moderna vaccine.
The National Institutes of Health's study on "mixing and matching" vaccines involved more than 450 adults who had been vaccinated with one of three U.S.-approved brands for at least 12 weeks.
These three groups were each divided into three new groups to receive one of the available vaccines as a booster.
After analyzing antibodies 15 days after the booster shot, researchers found that for those originally inoculated with J&J, levels were four times higher after a J&J booster, 35 times higher after a Pfizer booster and 76 times higher after a Moderna shot.
Experts are still looking into the possibility of "mixing" vaccines, which is not recommended under current guidelines in the United States.
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