Seroepidemiology of measles and rubella among Hong Kong young adults and the humoral responses of an MMR booster among participants with low antibody levels

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.