Abstract
Some individuals may not retain adequate immunity against measles and rubella years after two doses of measles, mumps, and rubella (MMR) vaccination due to vaccine failure. This study aimed to investigate the rates of vaccine failure and seroconversion by administering an MMR booster to young adults. We first assessed measles and rubella antibody levels using the Luminex multiplex assay, VIDAS IgG assay, and plaque reduction neutralization test (PRNT) among individuals aged 18-30 years old who had received two doses of MMR vaccine. Participants with low measles and/or rubella antibody levels as confirmed by VIDAS received an MMR booster. Antibody levels were measured at 1-month post-booster. Among 791 participants, the measles and rubella seroprevalence rates were 94.7% (95% CI: 92.9%-96.0%) and 97.3% (95% CI: 96.0%-98.3%), respectively. Lower seroprevalence rates were observed among older participants. 113 participants who received an MMR booster acquired higher measles and rubella antibody levels at 1-month post-booster compared to baseline. Although measles and rubella vaccine failures were observed among 5.3% and 2.7% of young adults, respectively, an MMR booster triggered a significant antibody response.
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