How well does the MMR vaccine protect against measles, mumps and rubella?

When given in the recommended number of doses, the vaccine protects: about 99 per cent of people against measles 95 per cent of people against mumps about 98 per cent of people against rubella. The MMR vaccine provides lifelong protection from measles, mumps and rubella. If a vaccinated child or adult still contracted these diseases, the symptoms would be much less severe.

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