Childhood vaccine
MMR Vaccine
The MMR vaccine protects against measles, mumps and rubella — three serious infections. It is given in childhood and is highly effective; two doses give strong, lasting protection.
What it protects against
It protects against measles (which can cause serious complications), mumps and rubella (which is dangerous in pregnancy).
Who it's for
It is given to children as part of the routine NHS schedule, with two doses; older children and adults who missed it can also catch up.
How it works
The MMR is a live, weakened vaccine that safely triggers lasting immunity to all three viruses. Two doses give the best protection.
Safety
Safety and side effects
MMR has an excellent safety record and does NOT cause autism — this has been thoroughly disproven by large studies. Side effects are usually mild, such as a brief rash or temperature about a week later.
Education and reference only. This is general information, not a personal recommendation, and does not list doses — follow the current NHS schedule and your clinician's advice. Seek urgent help for signs of a serious allergic reaction after any vaccine.
Answers
MMR Vaccine: frequently asked questions
Does the MMR vaccine cause autism?
No. This claim came from a discredited, fraudulent study and has been disproven by many large, high-quality studies. MMR does not cause autism, and it prevents serious diseases.
Why are two doses of MMR needed?
One dose protects most children, but a second dose ensures strong, lasting protection for nearly everyone against all three infections.
Related
Other childhood vaccines
Sources
Where this is drawn from
- NHS — Vaccinations
- UK Health Security Agency (UKHSA) — the Green Book
- WHO — immunization
Building patient-education content on vaccines?
We create clear, accurate, referenced health explainers and decision aids for teams and learners.