04/01/2025
MMR (Measles, Mumps, Rubella) Key Facts
⢠Measles is a highly contagious viral disease that can lead to serious health complications, including pneumonia, encephalitis (brain swelling), and death. The virus spreads easily and can survive for up to 2 hours on surfaces or in the air.
⢠The MMR vaccine is administered in two doses, with the first dose recommended at 12-15 months of age and the second at 4-6 years.Two doses are about 97% effective at preventing measles, providing long-term immunity.
⢠Common side effects from the vaccine include soreness and a mild rash or redness at the injection site, a fever, and temporary pain or stiffness in the joints.
Evidence Snapshot
Numerous studies conducted over many years in multiple countries have confirmed the safety and efficacy of the MMR vaccine. The vaccine's benefits in preventing measles, mumps, and rubella far outweigh the minimal risks associated with vaccination, which can include swelling in the cheeks or neck, a temporary low platelet count, and allergic reactions. In contrast, contracting measles can lead to severe health outcomes. Before the vaccine's introduction, there were up to 500 U.S. deaths annually from measles, all of which are now preventable through vaccination.