Quantification of vaccine-induced antibodies, including MMR (measles, mumps, rubella) antibody (Ab) [80], hepatitis B surface Ab (HBsAb) [81], diphtheria Ab, pertussis Ab, tetanus Ab, Japanese encephalitis Ab, polio Ab, and measles Ab [28], showed children from Guiyu were significantly lower, suggesting a reduced immunity of children living in Pb-exposed area. This evidence concerns the gene MRC1 and measles.