Furthermore, our previous studies demonstrated associations between: the same RARB SNP (rs1153600, p = 0.034) and two other RARB SNPs and rubella (whole) virus-specific IgG levels (as measured by a chemiluminescent immunoassay) in 738 children/young adults following two doses of MMR vaccine [8]; and RARB SNPs/haplotypes and variations in measles-specific neutralizing antibody levels and cellular immune outcomes after MMR vaccination [41]. Here, RARB is linked to rubella.