Ireland's Immunisation Catch-Up Gap Is a Recall Problem, Not Refusal

HPSC’s most recent figures put MMR uptake among two-year-olds in Ireland at 86.3%, well short of the 95% needed to stop measles finding enough susceptible children to spread between, even as confirmed cases climb across Europe. Almost none of that shortfall is families refusing the vaccine outright — free catch-up doses have been available through GPs for years, at any age. What it mostly is, is a recall problem: a child whose dose slipped past the recommended window and was never actively rebooked.

Where MMR coverage in Ireland actually sits

According to HPSC’s own June 2026 update, the latest data — from Quarter 3 of 2025 — shows MMR uptake among children aged 24 months at 86.3%, against the World Health Organization’s 95% target for population protection. That target isn’t an aspirational round number some committee picked; it’s the coverage level generally understood as the point at which measles, one of the most transmissible viruses in circulation, stops being able to find enough unprotected children to keep an outbreak going. Ireland has been sitting under that line for some time, and the same HPSC update notes that measles activity has been rising well beyond Irish shores: 961 cases were notified across the EU between January and April 2026 alone, and the UK recorded more than 700 cases in the first half of the year, concentrated around London and the West Midlands. Ireland is not insulated from a virus circulating that actively next door.

That last figure is worth sitting with. It isn’t a snapshot of toddlers whose parents are actively weighing up the vaccine right now — it’s young adults carrying a gap that opened years earlier in childhood and was never closed. A missed dose in Ireland doesn’t tend to announce itself as a refusal. It tends to sit quietly on a GP’s list, uncorrected, until either a routine check catches it, a school or college asks for proof, or — as has happened elsewhere in Europe this year — an outbreak forces the question.

The gap is timing and access, not a parent saying no

Ireland’s national schedule itself has just added a layer of complexity that makes this easier to understand. The HSE’s Primary Childhood Immunisation Schedule changed for children born on or after 1 October 2024, which means a practice’s list right now genuinely contains two different recommended timings running side by side — one for the older cohort, one for children born from that date forward. That’s not a criticism of the schedule change itself, which reflects updated clinical guidance; it’s a description of the operational reality it creates. A recall system built around “has this child had their jabs, yes or no” was already too blunt to catch a late dose reliably. A recall system that also has to know which schedule a given child follows, based on date of birth, is blunter still if it isn’t checked automatically.

The HSE’s own response to previous rises in measles activity backs up the “timing, not refusal” reading. When a cluster of cases and one death prompted a national catch-up push in 2024, the programme that followed didn’t ask families to reconsider a decision — it simply made the missed doses easier to get, opening free MMR vaccination to children, young adults and healthcare workers who had gone without, plus targeted clinics for students, refugees and international protection applicants. Dr Lucy Jessop, the HSE’s immunisation director, framed the risk at the time in plain clinical terms: measles complications can include “ear infections, pneumonia, febrile seizures” and, less commonly, “encephalitis and even death.” Nobody running that programme was trying to change anyone’s mind about vaccination. They were trying to find the people who already agreed with it and had simply never come back for the dose.

That gap between “eligible and entitled” and “actually vaccinated” is the whole story. HPSC confirms that free MMR catch-up remains available through general practice for anyone under-vaccinated, at any age — the entitlement was never the obstacle. What the entitlement doesn’t do on its own is find the specific overdue child on a specific practice’s list and get a parent to actually book the appointment.

Why a national catch-up drive doesn’t rebook a single overdue child

A national campaign is the right tool for setting direction and funding a response — it is not, on its own, a mechanism for working through any one practice’s list. Reporting from early 2024 described regional disparities where uptake fell well below the national figure in some counties, alongside the finding that close to a fifth of young men had no documented protection at all. Those aren’t uniform national numbers; they’re the sum of individual practices, each with its own list, each deciding on its own how hard to work through the families who haven’t come back in.

In most practices, that’s exactly the step that slips. Reception is busy with same-day calls, prescription queries and the rest of the working day, and recall is the task without an angry parent on the other end of the phone right now — which is precisely why it’s the easiest thing to defer until “next week.” A batch of letters goes out ahead of a school-entry check or a local case in the news; whoever calls back gets booked; whoever doesn’t hear back, or has moved house or changed number since the file was last updated, drops off the list until the next push. Dose-level targeting is rare in that approach — a family with one overdue jab and a family with three tend to get the same generic reminder, if they get one at all, and a non-responder rarely gets a second attempt through a different channel before the list moves on.

What a stalled recall list actually costs a GP practice

None of the population-level risk described above is something one practice can fix — outbreak exposure is a public health question that sits above any single list. But there’s a more immediate cost sitting quietly inside the appointment book, and it’s one a practice has more control over. A child who is overdue for MMR has usually also missed whatever else would normally happen at the same visit — a developmental check, a growth review, a general conversation with a GP or practice nurse. A family that has drifted off the vaccination list is very often a family drifting away from the practice relationship altogether, and the longer that drift goes unaddressed, the harder it becomes to close: contact details go stale, the family registers with someone else, or the child simply ages out of the window where a catch-up conversation happens naturally.

There’s a plainer cost too. Every overdue dose on a recall list represents a bookable appointment that never gets booked — capacity the practice already has, going unused because nobody reached the family in time to fill the slot. Multiply that across a full paediatric list, and a recall process that only runs in occasional bursts isn’t just an immunisation gap. It’s a diary with empty slots that a phone call or a text could have filled.

What proactive recall looks like in an Irish GP practice

None of this needs a new clinical protocol. The schedule exists, the entitlement to free catch-up vaccination exists, and the HSE has already shown, through its 2024 campaign, that it knows how to widen access when a gap opens. What’s missing in most practices is the unglamorous, repetitive, time-sensitive follow-through: checking who’s actually overdue, this week, and closing the loop with that family before a missed month turns into a missed year. That is exactly the kind of continuous, high-volume outreach an AI voice and WhatsApp agent can run without waiting for reception to find a quiet afternoon that rarely comes.

1. 1
   Flag overdue children automatically

   Cross-reference the practice list against the Primary Childhood Immunisation Schedule by date of birth, age and dose — not by whether a booking already exists — so a child on either side of the October 2024 schedule change is checked against the right timing.

2. 2
   Make contact the same week the gap opens

   An AI agent places the call, sends the text or opens a WhatsApp message as soon as a child crosses into overdue territory, instead of waiting for the next scheduled recall round or a quiet moment at reception.

3. 3
   Offer a real, bookable slot straight away

   The message carries an actual time against the practice's live diary, so a parent can confirm on the spot rather than being asked to ring back during opening hours.

4. 4
   Confirm again closer to the date

   A reminder the day before cuts the risk that the newly booked catch-up appointment itself becomes a missed one.

5. 5
   Escalate anyone who stays quiet

   A family who doesn't respond to a text gets a call; a family who doesn't answer a call gets a WhatsApp message — instead of falling off the list after a single unanswered attempt.

None of this replaces clinical judgement. A GP or practice nurse still decides what’s appropriate for a given child, and the disclaimer below still applies in full. What changes is that the administrative half of catch-up — finding who’s behind and getting them back through the door — stops depending on whether someone happened to have a spare half hour that week. Arbol runs that outreach as a standing process across a practice’s whole paediatric list: identifying who is overdue against the schedule, contacting them by phone, text or WhatsApp, offering a bookable slot, confirming it nearer the date, and escalating anyone who goes quiet — systematic, escalating contact, running every week rather than in the occasional catch-up drive a stretched practice can find time for.

If your practice is trying to close this gap before the next rise in cases forces the issue, the same operating principle — proactive contact instead of a waiting room that only fills when a parent happens to remember — sits behind how Arbol works. Finding the family, and the missed dose, before the outbreak does is the whole point.