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Researchers found that Johnson & Johnson receivers who received a Moderna booster experienced a 76-fold increase in their antibody levels, compared with a fourfold boost after a second Johnson & Johnson dosage. 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 occurs, individuals who got the Johnson & Johnson shot will be “on the horns of a problem,”said Dr. William Schaffner, medical director of the National Foundation for Infectious Diseases and a vaccine expert at Vanderbilt University.

The F.D.A. panel voted just on whether to advise a 2nd Johnson & Johnson shot on Friday. Researchers found that Johnson & Johnson recipients 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 recommendation on Johnson & Johnson boosters. If that happens, individuals who got the Johnson & Johnson shot will be “on the horns of an issue,”said Dr. William Schaffner, medical director of the National Foundation for Infectious Diseases and a vaccine expert at Vanderbilt University. Individuals need to consult with their doctors about whether it makes sense

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