Side effects of MMR

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MMR contains three separate vaccines in one injection. Each vaccine has different side effects at different times:

About a week to 10 days after the MMR immunisation some children get a very mild form of measles with a rash, a high temperature, loss of appetite and general feeling of being unwell for about 2 or 3 days.
About three to four weeks after the injection a child (1 in 50) can develop a mild form of mumps with swelling of the glands in the cheek, neck or under the jaw. This only lasts a day or two.
Very occasionally, the child may get a small rash of bruise-like spots about two weeks after the injection due to the rubella part of the vaccine. This usually gets better on its own, but as with any rash, you should get a doctorâ€™s advice as soon as possible.
Very rarely, children can have severe allergic reactions straight after any immunisation (about 1 in 100,000 immunisations for MMR). If the child is treated quickly, he or she will recover fully. People giving immunisations are trained to deal with allergic reactions to vaccines.
Some adult women may experience painful, stiff or swollen joints one to three weeks after receiving the rubella vaccine, usually lasting around 3 days.

People who have been recently immunised cannot infect others with the viruses contained in the MMR vaccine.