Measles isn’t just a childhood disease.

The MMR vaccine is safe and effective for children and adults

For the first half of 2025, there have been 27 measles outbreaks reported in the U.S. according the the Centers for Disease Control and Prevention (CDC). Measles is extremely contagious—almost everyone who has not had the MMR vaccine will get sick if exposed to the virus—and there are serious, sometimes deadly, health risks associated with this disease.

The measles vaccine is safe

The MMR vaccine provides the most effective protection against measles, mumps, and rubella. MMR vaccines usually protect people for life against measles and rubella; but immunity against mumps may decrease over time.

Adult vaccination—you may need a dose

People vaccinated prior to 1968 with either inactivated (killed) measles vaccine or vaccine of unknown type should be revaccinated. This vaccine was available in 1963–1967 and was not effective. Adults who are not sure of their vaccine history should consider receiving one dose of the MMR vaccine.

Children should be vaccinated on schedule

Children should receive the recommended MMR or MMRV (also protects against chickenpox) vaccine at the schedule recommended for their age by the CDC.

What to do if you’re exposed to the virus and not immune

If you don’t have immunity to measles and are exposed, talk to your doctor about getting the MMR vaccine. It is not harmful and may provide some protection from measles if given within 72 hours of exposure.

The CDC website contains helpful information about the measles vaccine for adults and children and for those planning to travel internationally or to outbreak areas in the US.

Learn more: cdc.gov/measles/vaccines