Background: Breakthrough infections of measles and mumps have raised concerns about the duration of vaccine-induced immunity, which might be improved by a third dose of measles-mumps-rubella vaccine (MMR3).
Methods: Here we compared (IgG) antibody levels against measles, mumps, and rubella in blood samples of 9-year-old children and young adults (18-25 years) following MMR2 and MMR3, respectively.
Results: We found that, in addition to antibody boosting for all 3 vaccine components, MMR3 resulted in lower antibody decay rates than MMR2; the declines were most prominent for mumps and rubella.
Conclusions: This study suggests that MMR3 provides long-lasting seroprotection against measles, mumps, and rubella.
Keywords: antibody response; humoral immunity; measles; mumps; rubella; seroprotection; vaccine; waning.
© The Author(s) 2020. Published by Oxford University Press on behalf of Infectious Diseases Society of America.