Catching up on missed vaccinations in the UK

A missed dose is not a lost dose

The most common fear after a missed appointment is that the whole course has to start again. It does not. NHS guidance is direct about it: vaccines are best given on time for the best protection, but if you or your child missed a vaccine, contact your GP to catch up. Doses already given still count.

This page is about missed, late and unrecorded doses. If you want the routine ages at which each vaccine is offered, that is the schedule, and it is a different question.

Who to contact, and what to ask for

Your GP surgery is the route for almost all childhood catch-up in the UK. Ring and say the child has missed doses and needs a catch-up schedule; the practice nurse will work out what is outstanding rather than simply repeating the missed appointment. Some vaccines are also offered through school-age programmes and, for older teenagers and adults, through pharmacies, but for babies and pre-schoolers the surgery is the place.

Before you ring, gather whatever record you have: the red book, any GP printout, and anything from another country. Vaccinations given in the UK also appear in your child's GP record, and vaccinations can be viewed in the NHS App for people old enough to have their own account.

When the records are uncertain

Clinicians do not guess. The UK Health Security Agency publishes a one-page algorithm, Vaccination of individuals with uncertain or incomplete immunisation status, which is based on the Green Book and is what an immunisation nurse will work from. It was last updated on 5 June 2026, and there is a matching screening algorithm.

The governing rule is uncomfortable but sensible: where there is no reliable documentary evidence, a person is assumed to be unimmunised and a full course is planned. Verbal recollection of "I think she had them all" is not evidence. An extra dose of a routine childhood vaccine is not harmful, whereas assuming protection that is not there is.

Chapter 11 of the Green Book, Immunisation schedule, is the underlying reference for what a complete course looks like at each age, and for the minimum intervals that apply when doses are being compressed to catch up.

If you have moved to the UK

Children arriving from other countries are one of the largest groups needing catch-up, and the picture is rarely simple. Other countries use different brand names, different antigen combinations and different schedules, so a foreign record can be genuinely hard to map onto the UK course. Bring the original document and any translation you have to the GP appointment.

Two gaps come up repeatedly. Several countries do not use the same combination products the UK uses, so a child may be protected against some components of a UK vaccine and not others. And a number of countries give MMR on a different timetable, or give measles alone, which leaves mumps and rubella uncovered.

MMR is the one to check

MMR is the vaccine most often incomplete, and the one with the most consequences when it is. Two doses are needed for full protection. There is no upper age limit — anyone who missed it as a child can ask their GP surgery for it, at any age, free on the NHS. The NHS is explicit that people going to university should make sure they have had two doses, because mumps and measles outbreaks cluster there.

If your child is due to start nursery or school, or you are travelling to a country with a measles outbreak, MMR is worth checking before you go rather than after.

Older children and teenagers

Catch-up does not stop at pre-school age. The MenACWY vaccine can still be requested from a GP up to the 25th birthday if it was missed. The MenB vaccine is being offered until March 2027 to young people born between 1 September 2007 and 31 August 2008, and to those born on or after 21 July 2001 who are starting university or certain further education colleges for the first time in autumn 2026 and living in student accommodation. HPV and the 3-in-1 teenage booster can also be caught up through the GP if school sessions were missed.

Why children fall behind in the first place

It is rarely refusal. The common causes are an illness that postponed an appointment and was never rebooked, a house move that broke the link with a surgery, a hospital admission during the window, a family that changed country, and the sheer administrative load of a first year. Rotavirus is the one series with an age ceiling in the UK schedule, so a run of illness in the first three months is worth flagging early; everything else can be picked up later.

A mild illness is not a reason to delay. Vaccination can go ahead when a child has a minor infection without fever; postponement is reserved for a genuinely feverish or unwell child, and even then the appointment should be rebooked immediately rather than left.

Practical points that save a second appointment

Ask for the catch-up to be written into the red book and the GP record at the time, not later. If several doses are outstanding, expect more than one visit, because minimum intervals between doses apply and cannot be shortcut. If your child was born prematurely, vaccinations are given according to chronological age from the date of birth, not corrected age, so premature babies are vaccinated on time rather than late — a point worth confirming if a surgery seems unsure.

Finally, do not let embarrassment cost you the appointment. Practices deal with incomplete schedules constantly, including for children who have been in and out of care, moved between countries, or simply had a very hard first year. Nobody is keeping score.