People who may need a measles vaccine booster include:
- Adults born after 1957 who have never had measles or been vaccinated, or who lack documentation of immunity. They should get at least one MMR shot, and certain high-risk groups should get two doses at least 28 days apart
- People who received only one dose of MMR vaccine, especially if born before 1989 when only one dose was standard. Two doses increase protection to 97%
- Individuals vaccinated between 1963 and 1967 who may have received an inactivated (less effective) measles vaccine. They should get one or two doses of MMR vaccine
- Healthcare workers, students in post-secondary education, international travelers, women of childbearing age before pregnancy, people living with immunocompromised individuals, and those at high risk of exposure should ensure they have two doses of MMR vaccine
- Babies 6 months or older in outbreak areas or traveling internationally should get vaccinated, with additional doses given later as part of the routine schedule
- Adults born before 1957 are generally presumed immune due to likely childhood infection and usually do not need vaccination unless they are healthcare workers or at high risk without proof of immunity
In summary, most people who completed the two-dose MMR series in childhood do not need a booster. Those uncertain of their vaccination status or in high- risk groups should consult a healthcare provider about receiving a booster dose to ensure full protection against measles
