The MMR vaccine is made from weakened forms of each of the measles, mumps and rubella viruses. The vaccine stimulates your immune system to respond and remember the viruses. This means that if you become infected with any of the three viruses, your immune system will recognise the virus and act to prevent infection.
Your child will usually be invited to have the first MMR vaccine when he or she is between 12 and 13 months old. This is part of the routine vaccination schedule. He or she will then be invited to have the second dose between the ages of three years and four months and five years old.
If your child needs to be protected against measles quickly, for example, during a measles outbreak, he or she can have the second dose one month after the first dose. If your child has the second dose before the age of 18 months, your child should still receive the routine dose. This will be when he or she reaches three years and four months to five years old, before starting school.
The MMR vaccine can be offered to young people when they leave school or before they enter further education if they haven’t already had both doses.
If you aren’t already immune to rubella, you will be offered the MMR vaccine if:
- you’re a woman of childbearing age
- you’re a healthcare worker who may come into contact with pregnant women
- you have just had a baby
Talk to your GP about the MMR vaccine if you’re thinking about becoming pregnant and if you have never had the MMR vaccination.
You can receive the MMR vaccine at any age. It’s not dangerous to receive the MMR vaccine more than once. If you can’t remember whether or not you have had it, ask your GP.
The MMR vaccine will usually be given in your upper arm or on the outside of your upper thigh.
Since the MMR vaccine was introduced in the UK in 1988, the number of children catching measles, mumps and rubella has fallen. The vaccine has also led to a drop in the number of pregnant women developing rubella during pregnancy.
After the first dose of the MMR vaccine, 64 out of 100 people will be protected against mumps, 90 out of 100 people will be protected against measles and 95 out of 100 people will be protected against rubella.
You will need two doses of the vaccine to provide enough protection against measles, mumps and rubella. It’s not very common, but some people may not respond to the first dose of the vaccine. Therefore, it’s important to have two doses of the vaccine. This is so that the second dose can work on anyone who isn’t immunised following the first dose.
There are some people who shouldn’t have the MMR vaccine. These include:
- people who have a severely weakened immune system because of an illness, such as HIV/AIDS
- anyone who has had an anaphylactic reaction (a severe allergic reaction) to gelatine or the antibiotic neomycin
- anyone who has had a confirmed anaphylactic reaction to a previous dose of the MMR vaccine
- pregnant women
Your GP may advise to postpone you or your child’s MMR vaccine until a later date, if:
- you or your child have received a blood donation of immunoglobulins
- you or your child have a fever
Talk to your GP if you’re not sure whether you or your child should have the MMR vaccine.
Side-effects are the unwanted but mostly mild and temporary effects of the vaccination. The three viruses in the vaccine act at different times and may produce different side-effects as they start to work.
About a week after the vaccination, you or your child may develop a fever or a rash. It usually lasts two to three days and is less likely to occur after the second dose of the vaccine.
Paracetamol or ibuprofen may help to reduce the symptoms of fever if you or your child is feeling unwell. At the time of your child’s immunisation, you should be given advice on the use and dose of paracetamol or ibuprofen to treat a fever.
You or your child may also get swollen glands two to three weeks after the MMR vaccine. This side-effect is temporary, and should only last for a short time.
It’s very rare; however, about one in every 1,000 immunised children may have a febrile convulsion. A febrile convulsion is a seizure or fit that is linked to a fever caused by an infection. However, the number of febrile convulsions caused by measles is much higher than the number the MMR vaccine may cause.
It’s not very common, but sometimes idiopathic thrombocytopenic purpura (ITP) can occur in children following immunisation. ITP is a condition which affects your blood and can cause bruising. If your child does develop ITP, it may occur within six weeks of the first dose of the vaccination, but should settle on its own after six to eight weeks.
If your child develops ITP, he or she may need to have a blood test. This is done to check to see if the vaccine has been effective, before the second dose is given.
Side-effects of the vaccine are usually mild and, most importantly, they are milder than the potentially serious consequences of having measles, mumps or rubella. If you’re concerned about any of your or your child’s symptoms, contact your GP.
Egg allergy and the MMR vaccine
The MMR vaccine is grown within chick embryos (eggs). However, evidence shows that it’s safe to give the vaccine to nearly all children, even those who have a very severe reaction to eggs.
If, however, you or your child has had an anaphylactic reaction to gelatine, the antibiotic neomycin or a previous dose of the vaccine, you must let your GP know.
Autism and inflammatory bowel disorders
You may have heard of a possible link between the MMR vaccine, autism and inflammatory bowel disorders. Many scientific researchers have investigated this link and it has now been proved wrong. There is a great amount of scientific proof that shows no connection between the MMR vaccine, autism and inflammatory bowel disorders.
Because the media attention gave the impression that there was one, some parents decided not to give their child the vaccine. The decision that some parents made is thought to have increased the number of people getting measles in some parts of the UK.
If your child has autism, you will usually start to notice signs when he or she is around two to three years old. As the MMR injection is given at around this age, it’s easy to understand why some parents thought there might be a link. Scientific studies show no link between the MMR vaccine, autism and inflammatory bowel disorders though.
The MMR vaccine is recommended as a combined vaccine, rather than a series of single ones. There are a number of reasons why the vaccines in the combined MMR aren't routinely given separately in the UK.
- You or your child would need to have six injections in total. This is more unpleasant because of the pain from each injection and six episodes of possible side-effects.
- There may be more delay before being completely vaccinated, leaving you or your child at risk of measles, mumps and rubella for longer.
- It could mean that fewer children have all the necessary vaccinations, increasing the level of measles, mumps and rubella in the UK.
- Single vaccines haven’t been researched very well. For example, there isn’t any guidance about how they should be given or how much of a gap is needed between injections.
It’s your decision whether or not your child has the MMR vaccine and if so, how they have it. If you decide to go ahead with a series of single vaccines, keep the following questions in mind.
- What exact type of vaccine is your child being offered?
- When and where has the vaccine been tested?
- What were the results of the tests – was the vaccine found to be safe?
- How will your child be followed-up after their vaccinations?
This information is intended to help you understand the possible advantages and disadvantages of the MMR vaccine. Think about how important each particular issue is to you – this will vary from person to person. You and your GP can work together to make the right decision for you. This will be based on your GP’s expert opinion and your personal values and beliefs.
- The MMR vaccine has helped to reduce the number of children catching measles, mumps and rubella.
- The vaccine contains a weak form of each virus. If you become infected with any of the viruses, your immune system will recognise the virus and act to prevent you getting an infection.
- The vaccine has reduced the number of women developing rubella during pregnancy.
- A week after the vaccination, you or your child may develop a fever or rash.
- Two to three weeks after the MMR vaccine, you or your child may get swollen glands.
- Around one in every 1,000 child who has had the vaccination may have a febrile seizure (fit).
- Your child may develop idiopathic thrombocytopenic purpura (ITP) following immunisation. ITP is a condition which affects the platelets (clotting cells) in your blood, and can cause bruising.
Do I need to have an MMR vaccination to travel abroad?
If you haven’t been immunised with the MMR vaccine, you should have it before you travel. This will protect you from measles, mumps and rubella. It will also prevent you bringing these illnesses back to the UK and spreading them further.
All three illnesses, in particular measles and mumps, need a large number of people to be immunised for the whole population to be protected. This is known as community immunity. This means that you may be unlikely to catch measles, mumps or rubella in the UK. But, you may be at risk if you travel abroad and haven’t been immunised against these infections.
Measles is still a common illness, particularly in parts of Africa and Asia. More than 20 million people are affected by measles each year. If you’re travelling to an area where measles is common or where there is a current outbreak, you should have the MMR vaccine.
If your child is less than six months old and is travelling with you, he or she should receive the MMR vaccine early. Your child should still continue to have a further two doses of the vaccine as part of the routine vaccine schedule.
Older children who are travelling who have received only one dose of MMR at the routine age of 12 to 13 months may have the second dose brought forward to at least one month after the first. If your child is 18 months or younger when the second dose is given, then the routine pre-school dose should still be given.
Why are two doses of MMR needed?
After the first dose of the MMR vaccine, most, but not all, people develop immunity to measles, mumps and rubella.
When you’re immunised against measles, mumps and rubella, you will have two vaccinations. You may not have immunity after the first dose, and so you will be offered a second dose. After the second dose, almost all people develop immunity.
The vaccine is usually given during childhood as part of the routine vaccination schedule. Your child will be offered the first dose between 12 to 13 months. Your child will be invited to have the second ‘booster’ when he or she is between three years and four months to five years old, before starting school. Having two doses of MMR will ensure that your child is fully protected against measles.
There are also some children who may miss the first immunisation. The second dose allows your child to be immunised before he or she starts school and will boost immunity of children who have already been immunised.
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