Measles Vaccine: Pros, Cons & What Patients Should Know
The measles vaccine is one of the most effective ways to prevent measles, a highly contagious disease that can cause pneumonia, brain inflammation, hospitalization, and, in some cases, death.
In the United States, protection against measles is provided through the MMR vaccine (measles, mumps, and rubella) or the MMRV vaccine, which also protects against chickenpox.
Like any medical intervention, vaccination has benefits and potential risks. Understanding both can help you have a more informed conversation with your healthcare provider.
Measles Vaccine: Pros vs. Cons
Potential Benefits | Potential Downsides |
Strong protection: Two doses of MMR are about 97% effective at preventing measles. | Common side effects: Soreness, fever, mild rash, or swollen glands can occur. |
Prevents serious disease: Measles can cause pneumonia, encephalitis, dehydration, and other complications. | Rare reactions: Febrile seizures and other serious reactions can occur, but they are uncommon. |
Helps prevent outbreaks: High vaccination rates reduce the spread of measles in communities. | Not appropriate for everyone: Some people, including most pregnant people and people with certain immune conditions, should not receive MMR. |
Protects others: Vaccination can help reduce exposure for people who cannot be vaccinated. | Not 100% effective: A small number of vaccinated people can still develop measles after exposure. |
Long-lasting protection: Most people who receive the recommended MMR vaccination are protected against measles for life. | Requires vaccination records and scheduling: Some people may need to determine whether they have received the recommended doses or have other evidence of immunity. |
CDC estimates that one dose of MMR is about 93% effective against measles and two doses are about 97% effective.
What Are the Most Common Side Effects?
Most reactions are mild and temporary. They can include:
Pain or redness where the shot was given
Fever
Mild rash
Swollen glands
A small increased risk of febrile seizure has been observed in young children following MMR vaccination—approximately one additional febrile seizure for every 3,000–4,000 children vaccinated.
Who Should Talk With a Healthcare Provider Before Vaccination?
MMR is a live vaccine, so it is not appropriate for everyone.
People who are pregnant or who have certain immune-system conditions may need to avoid MMR or take special precautions. A history of a severe allergic reaction to a previous dose or vaccine component is also important to discuss with a healthcare professional.
If you are unsure whether you or your child should receive the vaccine, ask a healthcare professional to review your medical history and vaccination records.
Does the MMR Vaccine Cause Autism?
Current CDC information states that studies have not found a link between MMR vaccination and autism.
The timing of routine childhood vaccination and the age at which signs of autism may become noticeable can lead to questions about whether the two are connected. Timing alone, however, does not demonstrate that one caused the other.
Why Does Measles Matter?
Measles is extremely contagious. It can cause serious complications including pneumonia, encephalitis, blindness, and severe dehydration. WHO estimates that measles caused approximately 95,000 deaths worldwide in 2024, despite the availability of an effective vaccine.
Vaccination has dramatically reduced measles illness and deaths worldwide. WHO estimates that measles vaccination prevented nearly 59 million deaths between 2000 and 2024.
Frequently Asked Questions
How effective is the measles vaccine?
Two doses of MMR are approximately 97% effective at preventing measles.
Can you still get measles if you have been vaccinated?
Yes. No vaccine provides 100% protection. However, two doses provide strong protection, and most vaccinated people are protected against measles long term.
Is there a measles-only vaccine?
Not routinely in the United States. Measles protection is provided through combination vaccines such as MMR and MMRV.
What if I don't know whether I received the vaccine?
Talk with your healthcare provider about your vaccination records and evidence of immunity. If documentation is unavailable, your provider can help determine whether vaccination or other testing is appropriate.
Can the MMR vaccine cause measles?
The MMR vaccine contains weakened, live viruses. It is designed to stimulate immunity without causing measles disease in people with normal immune systems.
Should everyone get the MMR vaccine?
MMR is recommended for people who are eligible and do not have evidence of immunity, but there are medical circumstances in which it should not be given. Your age, pregnancy status, immune system, previous reactions, vaccination history, travel, and exposure risk can all matter.
The Patient's Guide
There is no single medical decision that applies to every person.
When considering measles vaccination, look at both sides of the equation:
The risk of the vaccine → The risk of the disease → Your individual circumstances → Your healthcare provider's advice
For most eligible people, MMR provides strong protection against a highly contagious disease. At the same time, understanding possible side effects and situations where vaccination may not be appropriate is an important part of informed healthcare decision-making.
Use reliable sources and talk with a qualified healthcare professional when making decisions about vaccination.
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