Of note, pre-vaccination antibody GMCs within each sub-cohort were comparable between the MMR-RIT and MMR II groups for anti-measles (ranging from 2729.6 to 3644.1 mIU/mL), anti-mumps (49.6–60.7 EU/mL), and anti-rubella antibodies (45.1–61.5 IU/mL). Here, MRC1 is linked to rubella.