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Researchers found that Johnson & Johnson receivers who got a Moderna booster experienced a 76-fold increase in their antibody levels, compared with a fourfold increase after a 2nd Johnson & Johnson dose. Next week, a vaccine advisory panel to the Centers for Disease Control and Prevention will make its own recommendation on Johnson & Johnson boosters. If that happens, people who got the Johnson & Johnson shot will be “on the horns of a predicament,”said Dr. William Schaffner, medical director of the National Foundation for Infectious Diseases and a vaccine specialist at Vanderbilt University.

The F.D.A. panel voted just on whether to suggest a second Johnson & Johnson shot on Friday. Researchers found that Johnson & Johnson receivers who received a Moderna booster experienced a 76-fold boost in their antibody levels, compared with a fourfold boost after a second Johnson & Johnson dose. Next week, a vaccine advisory panel to the Centers for Disease Control and Prevention will make its own suggestion on Johnson & Johnson boosters. If that happens, people who got the Johnson & Johnson shot will be “on the horns of a predicament,”said Dr. William Schaffner, medical director of the National Foundation for Infectious Diseases and a vaccine expert at Vanderbilt University. Individuals ought to seek advice from with their physicians about whether it makes sense

to get a Johnson & Johnson booster as soon as it is authorized licensed wait for a possible mRNA booster, Dr. Schaffner said.