Born between January 2020 and August 2022? A letter about chickenpox is on its way
What happened
England is about to start a one-off catch-up round of a childhood vaccine, and the paperwork for it has just landed. On 13 October 2026, the government's MMRV vaccination programme pages were updated to add the catch-up resources. These are the practical items: a parent leaflet, a poster for surgery walls, and an editable invitation letter that GP practices fill in with your child's name and the practice phone number. The catch-up itself opens on 1 November 2026 and runs until 31 March 2028. It is aimed at one specific group: children born between 1 January 2020 and 31 August 2022. These children have already had their two MMR doses, at around 12 months and at 3 years 4 months. What they were not offered at those appointments was protection against chickenpox. They will now be offered a single dose of MMRV. That is the combined vaccine against measles, mumps, rubella and varicella - varicella being the virus that causes chickenpox. This sits alongside a bigger change that already happened. From 1 January 2026, MMRV replaced plain MMR in the routine childhood schedule in England. The first dose is given at one year old, and the second moved from 3 years 4 months to an 18-month appointment. The catch-up exists because one group of children fell between the old schedule and the new one.
Why this matters
Chickenpox has a reputation as a mild childhood illness you simply get through. Most of the time, that is fair. Most children have an itchy, miserable week and recover completely. But "most" is doing a lot of work in that sentence. A minority of children become seriously unwell. Complications include skin infections that need antibiotics, pneumonia, and in rare cases inflammation of the brain. Children with weakened immune systems are at higher risk, and so are newborn babies and some pregnant women who catch it from a child. There is also the ordinary cost that nobody counts. Chickenpox means a week off nursery or school, which usually means a week of a parent not being at work. Multiply that across a household with more than one child and it adds up. The narrow age window matters too. These children are now roughly four to six years old. They are in nursery and in the first years of primary school, which is exactly where chickenpox spreads fastest. They are the group most likely to meet the virus soon, and the group the catch-up was designed around. And there is a deadline, though a generous one. The offer closes on 31 March 2028. It is a one-off round, not a permanent part of the schedule.
What the evidence actually says
It helps to be clear about what has actually been decided and what has not. The decision to add varicella to the routine schedule was a UK-wide policy change, introduced in England from 1 January 2026. The catch-up is the tidying-up exercise that follows it, and the official guidance is specific about who it covers: children born between 1 January 2020 and 31 August 2022. On eligibility, the guidance is deliberately relaxed in one respect. Children are eligible if they have no history of chickenpox and have not already had two chickenpox-containing vaccine doses. But the guidance says there is no need to check a child's chickenpox history before offering the vaccine. If your child has already had chickenpox, or has had a chickenpox vaccine privately, you can mention it - and the guidance states there are no safety concerns about giving MMRV afterwards. That is a useful detail, because many parents genuinely cannot remember whether a rash three years ago was chickenpox or something else. You are not expected to prove it either way. One more point of honesty: the official pages set out the offer, the dates and the resources. They are not a summary of the clinical trial evidence behind varicella vaccination. If you want that, the vaccine chapters in the Green Book and the patient information leaflet are the right places to look, and your practice nurse can point you to them. The practical message from the guidance is simple. One dose, one age group, a window that closes in March 2028.
Practical advice
Work out whether your child is in the group. Check their date of birth against the window: 1 January 2020 to 31 August 2022. If they are inside it, the offer applies to them. If they were born from 1 September 2022 onwards, they should be getting MMRV through the routine schedule instead. Watch for the letter, but do not only wait for it. Practices are being given an invitation letter template to send out. Letters go astray, and families move. If your child is clearly in the window and nothing has arrived by late November, ring your GP surgery and ask. Do not try to recall whether they had chickenpox. The guidance says there is no need to check first. Mention it if you remember it clearly; do not delay the appointment to work it out. Ask for the leaflet if you want the detail. There is a parent leaflet, including a plain-text version, and your surgery can order printed copies. Reading it before the appointment is a better use of five minutes than searching online afterwards. Book early rather than late. The window runs to March 2028, which sounds like forever. In practice, appointments are easiest to get when a programme starts and hardest when everyone remembers at once. There is also no benefit in waiting - the protection only starts once the dose is given. If your child is unwell on the day, ring the surgery rather than simply not turning up. A mild cold is usually fine; a feverish illness may mean rebooking.
What to know
From 1 November 2026, children in England born between 1 January 2020 and 31 August 2022 are offered a single dose of the MMRV vaccine, to protect them against chickenpox. They have already had their two MMR doses, but missed out on the varicella part. The offer runs until 31 March 2028. Invitation letters, a parent leaflet and posters were added to the official guidance on 13 October 2026, so practices now have everything they need to start inviting families. You do not need to prove whether your child has had chickenpox before. Check the birth-date window, look out for the letter, and ring your surgery if nothing arrives. Sources: GOV.UK / UK Health Security Agency, "MMRV single dose selective catch-up resources", published 1 October 2026, https://www.gov.uk/government/publications/mmrv-single-dose-selective-catch-up-resources; GOV.UK / UK Health Security Agency, "Measles, mumps, rubella and varicella (MMRV) vaccination programme" collection, updated 13 October 2026, https://www.gov.uk/government/collections/measles-mumps-rubella-and-varicella-mmrv-vaccination-programme; UKHSA Blog, "What is the MMRV vaccine and is my child eligible?", 17 December 2025, https://ukhsa.blog.gov.uk/2025/12/17/what-is-the-mmrv-vaccine-and-is-my-child-eligible/ This article is for general information and does not replace advice from a doctor, practice nurse, pharmacist or other qualified healthcare professional. If you have questions about your child's vaccinations, speak to your GP surgery.
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