MMR Vaccine (Measles, Mumps and Rubella Vaccine)

Key vaccine facts

This combination vaccine gives protection against three serious diseases: measles, mumps, and rubella. See more information about the safety of combination vaccines.

Before the introduction of the MMR vaccine, all three diseases were extremely common. The majority of people had them at some point, usually as children. Although many people survived without long-term effects, others were left with serious disabilities and some children died. Complications of measles include fatal pneumonia and encephalitis (inflammation of the brain). In the year before a vaccine was introduced, 99 people died from measles complications. Measles also damages the immune system and makes people more vulnerable to other infections. Mumps can cause deafness and meningitis, and in the past rubella caused many babies to be born with serious abnormalities (known as Congenital Rubella Syndrome).

Between 2001 and 2013 there was a sharp rise in the number of UK measles cases, and three people died (see the Measles page for more information). Numbers of cases fell in 2014 and 2015, but increased again in 2016. 531 measles cases were reported in England and Wales in 2016. This is more than five times as many as the total number of cases in 2015. The majority of cases of measles have been in people who are unvaccinated. A significant number of cases have been linked to music festivals and other large public events. Public Health England is advising people to check that they are vaccinated against measles before they go to events like these. For more information see this Public Health England news story .

Numbers of measles cases have also been increasing in European countries. In the year to 31st October 2017, there were 30 deaths from measles in Europe. There have been particularly serious outbreaks in Romania, Italy and Germany. Travellers have brought a number of measles cases into the UK recently, and these are expected to continue. All travellers are advised to check that they are up to date with MMR vaccination before they travel. If you are travelling with a baby, the MMR vaccine can be given from six months of age before travelling to a country where measles is a risk or where an outbreak is taking place. See the Travel Health Pro website for more information.

A first dose of the MMR vaccine is given at 12-13 months in the UK schedule. The vaccine is not usually given earlier than this because studies have shown it does not work so well in children under 1 year of age. (See the short video under 'Is the vaccine safe?' at the bottom of the page.) A booster dose is given at 3 years and 4 months. There is also a catch-up programme for children, teenagers and young adults who have missed out on the MMR vaccine. Anyone who is not sure whether they have had measles, mumps and rubella vaccines can ask their GP for the MMR vaccine.

Single measles, mumps and rubella vaccines are not available in the UK through the NHS. For more information about why this is the case, see the statement from Public Health England .

MMR vaccines contain live viruses that have been weakened (attenuated), so that they stimulate the immune system but do not cause disease in healthy people. However the vaccine should not be given to people who are clinically immunosuppressed (either due to drug treatment or underlying illness). This is because the weakened viruses in the vaccine could replicate too much and cause serious infection. This includes babies whose mothers have had immunosuppressive treatment while they were pregnant or breastfeeding. For more information see the MHRA's Drug Safety Update (April 2016) .

Two brands of MMR vaccine are used in the UK: MMRVaxPro (see the Patient Information Leaflet ) and Priorix (see the Patient Information Leaflet

There are now a large number of studies that show no evidence at all of any link between the MMR vaccine and autism. In the short film below, experts say why they believe there is no link. See 'Is the vaccine safe?' towards the bottom of this page for a full list of studies.


The MMR vaccines used in the UK are called MMRVaxPro and Priorix. The two vaccines contain different ingredients. For a full list, see the MMRVaxPro Patient Information Leaflet ) and the PriorixPatient Information Leaflet . Other brands of MMR vaccines used in other countries may contain different ingredients. If you are not in the UK, ask for the Patient Information leaflet for the vaccine you are offered.

Apart from the active ingredients (the antigens), MMR vaccines may contain very small amounts of these ingredients:

MMRVaxPro and Priorix may both contain traces of neomycin, an antibiotic used in the production process to stop bacteria growing and contaminating the vaccine. See more information on antibiotics in vaccines.

MMR VaxPro contains gelatine derived from pigs. Priorix does not contain gelatine. See more information on gelatine in vaccines.

The rubella strain for both MMR vaccines is grown in the laboratory using human cell-lines.

The measles and mumps virus strains for both MMR vaccines are grown on a culture which contains chick embryo cells (see more information about the use of animal cell-lines to grow viruses for vaccines). The viruses are not grown on eggs. This means that there is not enough egg protein in the MMR vaccine to cause allergic reactions, so children with severe egg allergies can safely receive the MMR. In the past, people with an egg allergy were advised not to receive the MMR vaccine, but advice on this changed more than ten years ago. In the short film below, Professor Simon Dobson explains how we know that there is no increased risk of reactions to the MMR vaccine in children who are allergic to eggs.

Side effects

The MMR vaccine is a live attenuated (weakened) vaccine. It should not be given to people who are clinically immunosuppressed (either due to drug treatment or underlying illness) because the vaccine strains could replicate too much and cause a serious infection. This includes babies whose mothers have had immunosuppressive treatment in pregnancy or while breastfeeding. For more information see the MHRA's Drug Safety Update (April 2016) .

The three viruses in the MMR act over different time periods. The following side effects are common but not serious:

  • six to ten days after vaccination: a raised temperature, loss of appetite, and measles-like rash. This can happen when the measles part of the vaccine starts to work, and is normal.
  • More rarely children may get mumps-like symptoms (slightly raised temperature and swollen glands) about three weeks after their immunisation as the mumps part of the vaccine starts to work.
  • The rubella element can cause inflammation in joints (arthritis). Though quite common in adult women, in children this is rare, and usually disappears quickly.

More serious side effects are rare:

  • high temperatures, sometimes leading to fits (also called convulsions or febrile seizures)
  • very rarely, a skin rash of small, bruise-like spots up to six weeks after vaccination (immune thrombocytopenic purpura)

You should consult your doctor if these reactions happen after vaccination. This is mainly to check that it is the vaccine causing the symptoms, and not some unrelated disease.

As with any vaccine, medicine or food, there is a very small chance of a severe allergic reaction (anaphylaxis). Anaphylaxis is different from less severe allergic reactions because it causes life-threatening breathing and/or circulation problems. It is always serious but can be treated with adrenaline. In the UK between 1997 and 2003 there were a total of 130 reports of anaphylaxis following ALL immunisations, but all of these people survived. Around 117 million doses of vaccines were given in the UK during this period, making the overall rate around 1 in 900,000. Depending on the cause of the reaction, and following expert guidance, the person may be able to have vaccinations in the future.

Reactions listed under ‘possible side effects’ or ‘adverse events’ on vaccine product information sheets may not all be directly linked to the vaccine. See Vaccine side effects and adverse reactions for more information on why this is the case.

See more information on the monitoring of vaccine safety.

More information about the vaccine

In the short film below, experts talk about measles and its complications, and the importance of the MMR vaccine.

A life changed by measles: Sarah Clow's story

Sarah Clow fell seriously ill with measles when she was five and was left with lasting disabilities including deafness, partial sight and learning difficulties. Her mother Audrey talks about the impact this has had on Sarah and the whole family. Thanks to Rockhopper TV for the original footage.

Sarah was not vaccinated against measles as a child because she had had eczema. Advice on this has now changed; current advice is that children with eczema can safely receive the MMR vaccine and other vaccines.

SSPE - a serious complication of measles: Sarah Walton's story

Sarah Walton caught measles when she was 11 months old, and at the time recovered well. Twenty four years later, however, she fell ill and was diagnosed with subacute sclerosing panencephalitis (SSPE). SSPE is a persistent viral infection, a rare but devastating complication of measles which leads to a progressive destruction of the central nervous system. It causes dementia, loss of motor control, epilepsy and eventually death. In this video Sarah’s mother Jo talks about the impact that SSPE has had on Sarah and the people around her.

For more information about the egg allergy issues raised in the video, see the 'Ingredients' section above.

Is the vaccine safe?

There are now a large number of studies that show no evidence at all of any link between the MMR vaccine and autism. Autism is a developmental disorder which is usually diagnosed in pre-school children. The original research which suggested a link has now been discredited. The National Autistic Society in the UK has issued a statement saying that ‘there is no link between autism and the MMR vaccine’.

Below is a list of studies and their findings. Click on the links to view the abstracts (summaries) of the scientific papers:

The MMR vaccine is given later than some of the other vaccines in the UK schedule because it works better then. In the short film below, Professor Octavio Ramilo explains why this is. In other countries the vaccine may be given at 9 months. The MMR vaccine can safely be given to babies younger than this, especially if there is a measles outbreak.

Page last updated: 
Monday, February 5, 2018


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