MMR/MMRV Questions Answered by Dr Mike Whitaker
Which diseases does the MMR vaccine protect against?
MMR protects against three serious viral infections:
MMRV is a newer vaccine which protects against all three of these diseases plus chickenpox (varicella). Chickenpox can occasionally cause serious infections and neurological complications.
What is the MMR/MMRV vaccine and when is it offered?
From 1 January 2026, MMRV replaced MMR in the routine childhood vaccination schedule for younger children in England, adding protection against chickenpox to the existing measles, mumps and rubella protection.
MMR and MMRV are combined live vaccines containing weakened forms of the viruses they protect against. They train the immune system to recognise and fight the infections without causing the diseases themselves.
For younger children
Under the current NHS schedule, children born on or after 1 January 2025 are routinely offered:
MMRV dose 1 – 12 months
MMRV dose 2 – 18 months
The change was intended to provide earlier protection and improve vaccine uptake.
There are transitional arrangements for children born before 1 January 2025, so the vaccine and timing can depend on the child's date of birth and which vaccinations they have already received. Some older children may therefore be offered MMRV or MMR as part of catch-up arrangements.
Children aged 6 to 11 who have missed MMR/MMRV vaccination are also being targeted by the current national catch-up campaign.
Is the MMR/MMRV vaccine safe?
Yes. MMR and MMRV vaccines have been extensively studied and are routinely monitored for safety.
The NHS states that vaccination is the safest way to protect against serious infectious diseases, and current evidence shows that the benefits of vaccination outweigh the risks of known side effects. The risk of serious illness from the diseases they prevent is substantially greater than the risk of serious complications from vaccination.
There is also no evidence that MMR causes autism.
What happens if I skip or delay the MMR/MMRV vaccine?
Delaying vaccination means your child remains unprotected, or less well protected, against these infections for longer.
This is particularly important for measles, which spreads extremely easily and can cause serious complications. Maintaining high vaccination coverage also helps reduce the spread of infection and protects people who cannot be vaccinated.
If your child has missed an appointment, contact your GP surgery rather than waiting for the next routine appointment, especially if they have not received both doses of MMR or MMRV.
For the 2026/27 national campaign, NHS England is actively identifying children aged 12 months to under 6 years who are missing MMR/MMRV doses and also supporting vaccination of eligible 6-11 year olds.
What are the side effects of the MMR/MMRV vaccine?
Most children have no serious problems following vaccination.
Common MMRV side effects are generally mild and short-lived, lasting around 2 to 3 days. They can include:
A febrile convulsion (fever-related seizure) is an uncommon side effect which usually resolves quickly and fully. There is a small increased risk following the first dose of MMRV – approximately 35 additional cases per 100,000 children in the UKHSA information. Importantly, the risk of a febrile convulsion following measles infection is much higher, at approximately 2,300 per 100,000 cases.
Serious allergic reactions are very rare, and vaccination staff are trained to recognise and treat them.
If you have any concerns about your child’s symptoms following vaccination, call your GP surgery.
How can I prepare for my child's vaccination visit?
A few simple steps can make the appointment easier:
A minor illness without a high temperature does not necessarily mean vaccination needs to be postponed. If your child has a high temperature or is very unwell, contact the vaccination provider for advice.
Can adults get the MMR/MMRV vaccine?
Yes. Adults can receive MMR if they are not adequately protected.
The NHS recommends MMR for adults and older children born on or before 31 December 2019 who did not receive the vaccine when they were younger. This is particularly important for people who:
Adults generally receive MMR rather than MMRV. MMRV is primarily used for younger children in the current routine programme.
If you are unsure about your vaccination history, your GP surgery can check your records and advise whether vaccination is appropriate.
Where should people go if they want to receive the vaccine or are seeking more information?
If your child is due a routine vaccination:
Your GP surgery will normally contact you by letter, text, telephone or email. If you have not heard from them, don't wait – contact the surgery directly.
If your child has missed a vaccination:
Contact your GP surgery to arrange a catch-up appointment. You do not need to wait for an NHS invitation before contacting your GP. Your child’s school may also be involved in providing catch-up vaccination depending on local arrangements.
The current national campaign is also contacting eligible children aged 6 to 11 through routes including the NHS App, SMS, email or letter, while younger children are being contacted through their GP practice.
If you're an adult:
Contact your GP surgery if you think you need MMR or are unsure whether you've received both doses. Healthcare workers may also be able to access vaccination through their employer's occupational health service.
For reliable information, use trusted sources such as the NHS and GOV.UK, rather than relying on vaccination claims shared on social media.
Dr Michael J Whitaker MA Cantab MB BChir MRCGP
Lead General Practitioner
Lead GP for QOF, Long Term Conditions & Preventative Healthcare
MMR protects against three serious viral infections:
- Measles – Measles is an infection that spreads very easily and can cause serious problems in some people, usually starting with cold-like symptoms, followed by a rash a few days later. Some people may also get small spots in their mouth.
- Mumps – which can cause painful swelling around your cheeks and neck, which gets worse over a few days. This may cause ear, muscle and headaches, high temperatures or make it harder to chew, swallow or speak.
- Rubella (German measles) – usually mild in children. The main symptom of rubella is a spotty rash that starts on the face or behind the ears and spreads to the neck and body. Rubella can potentially be very serious during pregnancy because infection can cause miscarriage or serious harm to an unborn baby.
MMRV is a newer vaccine which protects against all three of these diseases plus chickenpox (varicella). Chickenpox can occasionally cause serious infections and neurological complications.
What is the MMR/MMRV vaccine and when is it offered?
From 1 January 2026, MMRV replaced MMR in the routine childhood vaccination schedule for younger children in England, adding protection against chickenpox to the existing measles, mumps and rubella protection.
MMR and MMRV are combined live vaccines containing weakened forms of the viruses they protect against. They train the immune system to recognise and fight the infections without causing the diseases themselves.
For younger children
Under the current NHS schedule, children born on or after 1 January 2025 are routinely offered:
MMRV dose 1 – 12 months
MMRV dose 2 – 18 months
The change was intended to provide earlier protection and improve vaccine uptake.
There are transitional arrangements for children born before 1 January 2025, so the vaccine and timing can depend on the child's date of birth and which vaccinations they have already received. Some older children may therefore be offered MMRV or MMR as part of catch-up arrangements.
Children aged 6 to 11 who have missed MMR/MMRV vaccination are also being targeted by the current national catch-up campaign.
Is the MMR/MMRV vaccine safe?
Yes. MMR and MMRV vaccines have been extensively studied and are routinely monitored for safety.
The NHS states that vaccination is the safest way to protect against serious infectious diseases, and current evidence shows that the benefits of vaccination outweigh the risks of known side effects. The risk of serious illness from the diseases they prevent is substantially greater than the risk of serious complications from vaccination.
There is also no evidence that MMR causes autism.
What happens if I skip or delay the MMR/MMRV vaccine?
Delaying vaccination means your child remains unprotected, or less well protected, against these infections for longer.
This is particularly important for measles, which spreads extremely easily and can cause serious complications. Maintaining high vaccination coverage also helps reduce the spread of infection and protects people who cannot be vaccinated.
If your child has missed an appointment, contact your GP surgery rather than waiting for the next routine appointment, especially if they have not received both doses of MMR or MMRV.
For the 2026/27 national campaign, NHS England is actively identifying children aged 12 months to under 6 years who are missing MMR/MMRV doses and also supporting vaccination of eligible 6-11 year olds.
What are the side effects of the MMR/MMRV vaccine?
Most children have no serious problems following vaccination.
Common MMRV side effects are generally mild and short-lived, lasting around 2 to 3 days. They can include:
- Soreness or discomfort around the injection site
- a raised temperature or fever
- feeling unwell
- a measles-like raised, blotchy rash, usually around 6 to 10 days after vaccination
- temporary swelling of the face or aching joints, around 2 to 3 weeks after vaccination
- a small spotty chickenpox-like rash around the injection site, around 3 to 4 weeks after vaccination
A febrile convulsion (fever-related seizure) is an uncommon side effect which usually resolves quickly and fully. There is a small increased risk following the first dose of MMRV – approximately 35 additional cases per 100,000 children in the UKHSA information. Importantly, the risk of a febrile convulsion following measles infection is much higher, at approximately 2,300 per 100,000 cases.
Serious allergic reactions are very rare, and vaccination staff are trained to recognise and treat them.
If you have any concerns about your child’s symptoms following vaccination, call your GP surgery.
How can I prepare for my child's vaccination visit?
A few simple steps can make the appointment easier:
- Bring your child's Red Book (Personal Child Health Record) if you have it.
- Dress your child in clothing that makes the injection site easy to access.
- Explain the vaccination simply and positively – for example, that they may feel a quick "scratch".
- Try to stay calm; children can pick up on a parent's anxiety.
- Holding your child on your lap during the injection can help them feel secure.
- Tell the healthcare professional about any relevant medical conditions, previous serious allergic reactions or concerns you have before vaccination.
A minor illness without a high temperature does not necessarily mean vaccination needs to be postponed. If your child has a high temperature or is very unwell, contact the vaccination provider for advice.
Can adults get the MMR/MMRV vaccine?
Yes. Adults can receive MMR if they are not adequately protected.
The NHS recommends MMR for adults and older children born on or before 31 December 2019 who did not receive the vaccine when they were younger. This is particularly important for people who:
- are unsure whether they have had both doses
- were born between 1970 and 1990
- are healthcare workers
- could become pregnant
- are travelling to an area where measles, mumps or rubella are more common.
Adults generally receive MMR rather than MMRV. MMRV is primarily used for younger children in the current routine programme.
If you are unsure about your vaccination history, your GP surgery can check your records and advise whether vaccination is appropriate.
Where should people go if they want to receive the vaccine or are seeking more information?
If your child is due a routine vaccination:
Your GP surgery will normally contact you by letter, text, telephone or email. If you have not heard from them, don't wait – contact the surgery directly.
If your child has missed a vaccination:
Contact your GP surgery to arrange a catch-up appointment. You do not need to wait for an NHS invitation before contacting your GP. Your child’s school may also be involved in providing catch-up vaccination depending on local arrangements.
The current national campaign is also contacting eligible children aged 6 to 11 through routes including the NHS App, SMS, email or letter, while younger children are being contacted through their GP practice.
If you're an adult:
Contact your GP surgery if you think you need MMR or are unsure whether you've received both doses. Healthcare workers may also be able to access vaccination through their employer's occupational health service.
For reliable information, use trusted sources such as the NHS and GOV.UK, rather than relying on vaccination claims shared on social media.
Dr Michael J Whitaker MA Cantab MB BChir MRCGP
Lead General Practitioner
Lead GP for QOF, Long Term Conditions & Preventative Healthcare