Mini m, m & r
Receiving the MMR jab is just like a mini infection of measles, mumps and rubella. Both the jab, and the real infection, will protect your child from these three diseases next time they come around.
That's because, after coming face to face with an onslaught of tiny viruses, their immune system learns to recognise the danger and remains ready and waiting to fight the unwelcome invaders next time they attack.
link: Find out more about how your immune system works
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