Most adults do not need a measles booster. As of October 2026, the CVS MMR guide says people who received two doses of the measles vaccine starting at 12 months or older “are protected for life and do not need a booster.” Whether you need anything extra mostly comes down to your birth year and whether you can find your vaccine records.
Who does not need a measles booster?
If you had two doses of the measles vaccine starting at 12 months or older, the CVS guide says you are protected for life. The guide says it is based on CDC guidance and was up to date as of March 30, 2026.
In an interview the University of Colorado School of Medicine interview published, a primary care physician on its faculty says that “most adults do not need a booster vaccination.”
Who might need a booster?
Birth year and the type of shot you got both matter. Here is how the two sources describe the groups:
| Birth year or situation | What the sources say |
|---|---|
| Born before 1957 | Usually considered immune (CVS guide). Considered immune because they were alive during several measles epidemics before MMR was distributed in 1963 (university interview). |
| Born 1957 to 1968 | Someone who received the killed measles vaccine, received a measles vaccine of unknown type, or cannot find documentation of MMR vaccination should likely receive an MMR booster (university interview). |
| Vaccinated 1963 to 1967 | May have received an older version that was not fully effective. Check with a health care provider to see if a modern vaccine is recommended (CVS guide). |
| Shot after 1968 | The university interview says that after 1968 the measles vaccine was highly effective at providing lifelong immunity. |
Teens and adults who did not get both childhood doses might need additional doses, according to the CVS guide, which cites CDC guidance. The CVS guide and the university interview draw the older-vaccine window a little differently, so your records and your provider should settle which group applies to you.
Should seniors have a measles booster?
For most seniors, the answer is no, provided they were born before 1957. Both sources treat people in that group as immune. Seniors born in 1957 or later should follow the same record check as anyone else in the table above.
How do I check my measles immunity?
Start with your records. The university interview advises trying to get your immunization records first, because your current doctor may not have them. You can request them from a health department or from the pediatrician you saw as a child.
If records cannot be found, the CVS guide says some clinics can run a blood test that checks for antibodies against measles, mumps and rubella. The university interview also notes that there are ways to test whether a person has received some vaccines.
Can you still get measles after vaccination?
Yes, though it is uncommon. The CVS guide says, “Very few people who are vaccinated will still get measles if they are exposed to the virus.” It reports that one dose is 93 percent effective against measles and two doses are 97 percent effective.
The same guide notes that a small number of vaccinated people may no longer be protected later in life. That is one reason a childhood shot does not always mean you are still protected in middle age or later.
If you were vaccinated 40 years ago and want to know where you stand, look for the date and number of doses on your record. Shots given after 1968 are the ones the university interview describes as highly effective at providing lifelong immunity.
The research base is long-standing. A 1988 Pediatrics trial on MMR, indexed on PubMed by the U.S. National Library of Medicine, reported that “Seroconversion rates to measles, mumps, and rubella exceeded 96% in both groups.” Seroconversion means the body developed antibodies.
If I am vaccinated and exposed, can I spread measles?
Being vaccinated lowers the chance of spreading measles. The CVS guide says that vaccinated people who do get measles “their symptoms are usually milder, and they’re less likely to spread the illness to others.”
Is an extra measles vaccine harmful?
The university interview says that for the most part, “an extra dose will not be harmful.” It adds that the side effects of a repeat dose are very similar to those when no extra dose is given.
The CVS guide lists the common side effects as fever, mild rash, a sore arm where the vaccine was given, and temporary joint pain and stiffness. It lists fever-induced seizure and signs of a severe allergic reaction as rare but serious, and says anyone with a serious reaction should seek medical attention immediately.
The CVS guide also lists people who are pregnant and people with a severely weakened immune system as groups who should check with a health care provider first.
What is still unclear?
The CVS guide says immunity to mumps can decrease over time in some cases. For measles, it says most people who receive the recommended doses are protected for life. The older-vaccine birth window differs between the two sources, so that is the detail to confirm with your records and provider.
What should I bring to my provider?
- Your birth year and any vaccine records you can find.
- Whether you may have received an older measles shot between 1957 and 1968 or between 1963 and 1967.
- Whether a blood test makes sense if your records are missing.
- Whether you are pregnant or have a severely weakened immune system.
Related reading
If staying active is part of your routine, how much exercise do adults need per week covers the general numbers. If you coach young athletes, the youth trainer certification guide is a good place to start.
By the Fitness Career Guide Editorial Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.