If you have not had two doses of the MMR vaccine, you are at risk of catching the diseases the vaccine protects against. If you have already had one dose you will only need one further dose, no matter how long ago you had your first dose. If you need two doses, they can be given one month apart. Contact your GP surgery as soon as possible to catch up on any missed MMR vaccinations.
Before starting school, university or other further education you should make sure you have had two doses of the MMR vaccine.