Johnson & Johnson Vaccine Recipients May Be Better Off with a Booster of Pfizer or Moderna: FDA
A medical professional giving a vaccine shot.Photo: Getty The FDA went through two studies —one from Johnson & Johnson, which has beentesting the effectiveness of a second dose of their vaccineandanother that looked atfollowing the Johnson & Johnson vaccine with a booster shot of Pfizer or Moderna, which are mRNA vaccines that use a different delivery system to create antibodies that protect against COVID-19. While a second dose of Johnson & Johnsondid improve the immune responseamong people who received the vaccine, the other study, which has not yet been published, found that a booster shot of Moderna led to the biggest increase in antibodies, a 76-fold improvement....