can you get measles if you're vaccinated

Yes, you can get measles even if you’re vaccinated, but it is rare, and if it happens, it’s usually milder and less contagious than in someone who isn’t vaccinated.

How often does this happen?

• Two doses of the measles (MMR) vaccine prevent about 97% of measles cases.

• That means roughly 3 out of 100 fully vaccinated people could still get measles if they are exposed closely to the virus.

• With only one dose, protection is lower (around 93%), so “breakthrough” infections are a bit more likely.

These “breakthrough” infections are still uncommon, and high vaccination rates in a community make them even less likely.

Why can measles happen after vaccination?

Doctors see a few main reasons:

• Immune system didn’t respond strongly enough
  Some people’s immune systems simply don’t build full, long‑lasting protection after the shots (primary vaccine failure).

• Very intense exposure
  Someone who did respond to the vaccine can still get sick if they have prolonged, close contact with measles (for example, in a household or classroom with unvaccinated cases).

• Only one dose or uncertain history
  People who never got their second dose, or who aren’t sure about their records, may not be as well protected as they think.

What is measles like if you’re vaccinated?

When vaccinated people get measles, it tends to look different:

• Symptoms usually:
  • Are milder (lower fever, less severe rash, fewer complications like pneumonia).

* May be “modified measles,” meaning the typical full‑blown picture isn’t all there.

• They are:
  • Less likely to be hospitalized or develop serious complications.
  • Less likely to spread measles to others, including babies and people with weak immune systems.

Health workers sometimes do special lab tests to tell if an infection is from wild measles or very rare vaccine‑associated cases (after a recent shot).

What about “vaccine measles”?

• The measles part of MMR is a live but weakened virus, so in extremely rare cases a person can develop a measles‑like illness after the shot itself.

• Reports of this are very rare, and transmission from these vaccine‑associated cases appears to be negligible or not seen in practice.

This is different from catching wild measles in the community after being vaccinated, which is what most people mean by “getting measles while vaccinated.”

Should you still get (or stay) vaccinated?

Yes—very strongly recommended:

• Two doses:
  • Give very high protection against measles (around 97%).

* Dramatically reduce the risk of severe disease, hospitalization, and complications.

• Vaccination also:
  • Helps protect babies too young for the vaccine and people who can’t be vaccinated for medical reasons.
  • Makes outbreaks smaller and easier to control when measles is imported into a community.

If you’re unsure whether you’re fully vaccinated or immune, a healthcare professional can check your records, order a blood test for immunity, or give you an MMR dose to be safe.

Bottom line:
You can get measles if you’re vaccinated, but it is uncommon, and vaccination makes any infection milder and less likely to spread—so staying up to date on MMR is still the best protection for you and the people around you.