Australia's childhood vaccination coverage: a five-year slide

National coverage under the National Immunisation Program has dropped for five consecutive years: 90.5% of one-year-olds, 88.4% of two-year-olds and 92.5% of five-year-olds were fully vaccinated in 2025, each below where the same cohort sat in 2020 (NCIRS). Roughly 80,000 children across those three milestones were not fully covered. None of that decline is evenly spread — and the unevenness is where a clinic’s own systems, not national policy, can move the number.

The slide did not start at school age — it started at 12 months

The Annual Immunisation Coverage Report, run by NCIRS on National Immunisation Program data, tracks coverage at the three standard childhood milestones — 12, 24 and 60 months — and every one of them is down since 2020. Twelve-month coverage has fallen 4.3 percentage points, 24-month coverage 3.7 points, and 60-month coverage 2.3 points (NCIRS). The shape of that decline is worth pausing on: the earliest milestone lost the most ground, and by 24 months coverage was sitting under the 90% mark the National Immunisation Program treats as a floor. A child who slips at 12 months does not automatically catch up by school entry — the 60-month figure only looks comparatively steady because five years gives families, and practices, more chances to close the gap before it is measured.

There is a second decline hiding inside those headline figures, and it matters more for a clinic than the milestone numbers do: timeliness. NCIRS also reports on-time coverage — whether a dose landed on the schedule, not just whether it eventually arrived — and on that measure the second dose of DTP-containing vaccine was 9.2 percentage points behind where it stood in the first quarter of 2020, while on-time coverage of the first MMR dose was down 12.0 points comparing the last quarter of 2025 with the same quarter in 2020 (NCIRS). A child can eventually land inside the “fully vaccinated by 24 months” figure and still have spent months exposed to measles or pertussis while waiting for a dose that was due earlier. Timeliness is exactly the variable a recall system, rather than a reminder letter, is built to fix — a distinction the sections below come back to.

The national average hides where the real gap sits

Averaging the country into one figure obscures the part of this story that should worry a clinic most: coverage has not fallen evenly across age groups or across populations, and the widest gaps sit in cohorts that a general practice sees every week. Adolescent HPV coverage nationally has fallen below 80% for both sexes — 78.7% for girls and 75.6% for boys — against a program target of 90% by 2030 (NCIRS), and national meningococcal ACWY coverage in adolescents turning 17 remained below 75% for girls and below 70% for boys (NCIRS, Annual Immunisation Coverage Report 2025 – Summary). Among Aboriginal and Torres Strait Islander adolescents the same two vaccines fall further still: HPV coverage at age 15 sits below 75% for girls and below 70% for boys, and meningococcal ACWY coverage at age 17 sits below 65% for girls and below 55% for boys (NCIRS).

That is not a rounding difference between two ways of counting the same thing — it is the same national program producing a materially worse outcome for one population than another, inside the same clinics and the same catch-up calculator. A recall list that is not actively segmented for Aboriginal and Torres Strait Islander patients will systematically under-represent the group carrying the largest gap, because an equal-weighted list mirrors the national average, not the cohort that most needs the call.

Late is not the same as never — and the late share is large

NCIRS’s 2025 summary separates “eventually fully vaccinated” from “vaccinated on time” (within 30 days of the recommended age), and the second measure is where the operational work sits. Beyond the percentage-point drops already noted above, the summary states the absolute share of lateness plainly: in 2025, two in five children received the first MMR dose late, and one in five received the second DTP-containing dose late (NCIRS Annual Immunisation Coverage Report 2025 – Summary).

Among Aboriginal and Torres Strait Islander children the same on-time gap is not smaller. On-time coverage of the second DTP-containing dose was 8.9 percentage points lower in late 2025 than in early 2020, and on-time coverage of the first MMR dose was 13.6 points lower (NCIRS). A practice that only audits “fully vaccinated by 24 months” will keep congratulating itself while those months of delay accumulate — and delay is exactly what a monthly AIR overdue pull is designed to interrupt.

Influenza adds a quieter gap that many childhood recall lists still ignore. Annual influenza vaccination is funded under the National Immunisation Program for children aged 6 months to under 5 years, yet less than one-third of children in that age group received an influenza vaccine in 2025 (NCIRS). That is a different problem from pentavalent or MMR catch-up, but it is the same operational muscle: identify who is due, assign ownership, close the loop.

Acceptance now outranks access as the stated barrier — that changes the call script

Coverage declines are often framed as an access problem: hard-to-book appointments, transport, clinic hours. NCIRS reports that the second annual National Vaccination Insights survey found parental beliefs and concerns about vaccines (acceptance barriers) had overtaken practical issues associated with vaccinations (access barriers) as the main drivers of missed childhood vaccinations (NCIRS). That does not retire the access work — an overdue list still has to be pulled — but it does change what a recall call is for. A reminder that only offers a booking link treats every overdue dose as a logistics failure. Where acceptance is the dominant barrier, the call needs a named clinician or practice nurse prepared to answer specific concerns, not only to offer the next available slot.

NCIRS frames the response inside the National Immunisation Strategy 2025–2030: coordinated implementation to restore confidence, close equity gaps and reverse the five-year slide. A single clinic cannot run the national strategy. It can stop treating every overdue child as if the only missing ingredient were a text message.

Recall is a standard, not a nice-to-have, for an accredited practice

It is easy to read the coverage numbers as a policy problem sitting above the level of an individual clinic. The RACGP’s own accreditation standards say otherwise. Criterion GP2.2 of the RACGP Standards for General Practices requires an accredited practice to run a documented follow-up system, and it draws an explicit line between two different mechanisms: a recall, triggered when a clinician determines a specific patient needs review, and a reminder, a periodic, practice-initiated prompt for preventive activity — and immunisation for children and high-risk groups is the standard’s own example of what a reminder system covers (RACGP, Criterion GP2.2). That distinction is not academic. A reminder assumes the patient is still engaged enough to act on a letter or a text; a recall assumes someone in the practice takes responsibility for closing the loop. Given how much of the 2025 decline shows up as late doses rather than missed ones altogether, a reminder-only setup is tuned to the wrong half of the problem.

South Western Sydney Primary Health Network’s guidance to general practices on childhood immunisation quality improvement points at the same gap from the operational side, not the standards side: practices can pull the Australian Immunisation Register’s 10A report or use population-level tools to identify exactly which patients are overdue, rather than waiting for a family to notice and book (South Western Sydney PHN). Put the RACGP standard and the PHN’s operational guidance next to each other and the shape of a working system becomes obvious: identify who is overdue from the register data the practice already has, then run an active recall — a phone call or a task assigned to a specific staff member, not a mail-merge — for anyone who has slipped past the on-time window.

What your practice can do

• Pull an overdue list on a fixed schedule, not only when a parent asks. The Australian Immunisation Register’s 10A report identifies patients who are overdue for a scheduled vaccine; running it monthly catches the on-time slippage the national data shows growing, instead of only catching outright non-vaccination at the next visit.
• Separate recall from reminder in your own process, the way the RACGP standard does. A reminder text works for a family that is engaged and just needs a nudge. An overdue dose past its catch-up window should trigger an active recall — a task assigned to a named staff member who follows up until the loop closes, with the attempt logged in the record.
• Give AHPRA-registered practice nurses clear ownership of the catch-up caseload. Vaccine administration, catch-up scheduling using the National Immunisation Catch-up Calculator, and running the recall list are all tasks a practice nurse can own end to end within their scope of practice, freeing the follow-up call from competing against a GP’s own booked list.
• Segment the recall list, not just the reminder list. Because the widest coverage gaps sit in specific cohorts rather than the population as a whole, an unsegmented list under-represents exactly the patients the data says need the most active follow-up.
• Track timeliness, not only eventual completion. A dashboard that only shows “fully vaccinated by 24 months” hides the months a child spent overdue. Reviewing how many doses landed inside the scheduled window, not just before the milestone deadline, surfaces the earlier-stage problem the national figures describe.
• Train the recall script for acceptance, not only for booking. When beliefs and concerns outrank logistics as the stated reason for a missed dose, the staff member making the call needs a clear path to a clinician conversation — not only a link to book.
• Include NIP-funded influenza for under-fives in the same overdue review. It is a different biological from the childhood schedule milestones, but it is the same register and the same ownership problem.

Operational checklist for one quarter

1. Week 1: Pull the AIR 10A overdue list; split it into on-time window vs past catch-up window, and tag Aboriginal and Torres Strait Islander patients explicitly.
2. Week 2: Assign each past-window case to a named practice nurse with a logged attempt and a next action date.
3. Week 3: Audit reminder vs recall language in your SMS and letters against RACGP Criterion GP2.2; rewrite any message that treats an overdue dose as a soft nudge.
4. Week 4: Review how many overdue doses closed, how many needed a clinician conversation, and how many remain — then reset the monthly pull.

None of this requires waiting on a national policy response. A recall system that a practice already owns — its own patient list, its own register data, its own nursing staff — is the one lever in this entire picture that a single clinic can pull this quarter. For the policy backdrop and how the National Immunisation Program fits into the broader Australian primary care system, see Arbol’s overview of general practice in Australia.