J&J says coronavirus vaccine booster shot triggered an antibody surge

ignificant increases in antibody responses were seen in subjects ages 18 to 55 years old, and among those 65 or older who were given a lower dose of the booster.

Johnson & Johnson said a booster of its Covid-19 vaccine provided a rapid and strong increase in antibodies, supporting use of a second shot among people who previously received its single-dose immunization.

A second dose of the J&J vaccine led to a ninefold increase in Covid-fighting antibodies compared with the levels participants had 28 days after getting their first shot, the health-care giant said Wednesday, citing interim data from an early-stage trial.

Trial participants were given the booster six months after the first shot, according to J&J. Significant increases in antibody responses were seen in subjects ages 18 to 55