What does the medical abbreviation MMR mean?

MMR stands for measles, mumps, and rubella. It is a vaccine that protects people from these three highly contagious diseases. The MMR vaccine is typically given to children in two doses, the first dose at 12 to 15 months of age and the second dose at 4 to 6 years of age. The MMR vaccine is very effective in preventing measles, mumps, and rubella.