Zero, one, or two doses of MMR vaccine are needed for the adults described below.
- adults born before 1957 except healthcare personnel*
- adults born 1957 or later who are at low risk (i.e., not an international traveler or healthcare worker, or person attending college or other post-high school educational institution) and who have already received one or more documented doses of live measles vaccine
- adults with laboratory evidence of immunity or laboratory confirmation of measles
One dose of MMR vaccine:
- adults born in 1957 or later who are at low risk (i.e., not an international traveler, healthcare worker, or person attending college or other post-high school educational institution) and have no documented vaccination with live measles vaccine and no laboratory evidence of immunity or prior measles infection
Two doses of MMR vaccine:
- high-risk adults without any prior documented live measles vaccination and no laboratory evidence of immunity or prior measles infection, including:
- healthcare personnel*
- international travelers born in 1957 or later
- people attending colleges and other post-high school educational institutions
People who previously received a dose of measles vaccine in 1963–1967 and are unsure which type of vaccine it was, or are sure it was inactivated measles vaccine, should be revaccinated with either one (if low-risk) or two (if high-risk) doses of MMR vaccine.
* Healthcare personnel born before 1957 should be considered for MMR vaccination in the absence of an outbreak, but are recommended for MMR vaccination during outbreaks.