Education, digital records and integrated care can boost childhood vaccination rates

Vaccination remains one of the most cost-effective public health tools, but missed opportunities continue to undermine its impact. A missed opportunity occurs when a child visits a health facility, has no valid contraindication to vaccination and is still not given all vaccines due. For children under five, the consequences can be serious because this age group faces high risks from vaccine-preventable diseases.

According to new research published in Vaccines, missed opportunities for vaccination can be reduced, but only when health systems move beyond passive vaccine availability and actively check, remind, educate and integrate services.

The study, A Systematic Review and Meta-Analysis on the Effectiveness of Interventions in Reducing Missed Opportunities for Vaccination Among Children Under Age Five, reviewed intervention evidence on children who were eligible for vaccination but did not receive all recommended doses during a healthcare visit. The analysis found that several strategies, including education, electronic immunisation registries, clinical alerts, integrated child health services, pharmacist involvement, combined vaccines, financial incentives and multicomponent outreach, were linked to lower missed vaccination opportunities.

Missed vaccination remains a preventable gap in child health

The study notes that missed opportunities have remained stubbornly common despite decades of attention. Earlier global evidence found high levels of missed vaccination opportunities, and more recent estimates still show a substantial burden in resource-limited settings. This means the problem is not simply lack of vaccine demand. It also reflects health-system weaknesses, including poor screening, weak record use, missed integration with child health services and insufficient follow-up.

Children under five are especially affected because routine immunisation depends heavily on caregivers, frontline health workers and the way clinics organise services. A child may come to a facility for illness, nutrition support or another health need, but leave without vaccination because staff do not check immunisation status or because services are not linked.

The review found that education interventions reduced the risk of missed opportunities by 35 percent overall. Health personnel education appeared more effective than caregiver-only education, suggesting that provider behaviour is central to closing the gap. Training can help staff recognise eligible children, avoid false contraindications, understand vaccine schedules and use every clinic visit as a vaccination opportunity.

Caregiver education remains important, especially in settings where parents may misunderstand vaccine cards, timing, safety or contraindications. But the findings suggest that educating families alone is unlikely to solve missed opportunities if health workers and clinic systems are not prepared to act during every encounter.

Digital records and integrated services show strong promise

Electronic immunisation registries and alerts were another major finding. The study found that electronic systems and alerts reduced missed vaccination opportunities by 29 percent overall. Alerts tied to patient care were particularly important because they can notify clinicians when a child is due or delayed, turning the health record into an active screening tool rather than a passive archive.

For countries trying to modernise immunisation systems, digital records can help identify defaulters, track vaccine schedules and support reminder systems. When paired with point-of-care alerts, they can help prevent children from leaving a clinic without needed doses. The study also notes that newer digital tools and artificial intelligence-supported registries could further improve scheduling, vaccine supply planning and personalised reminders, though implementation will depend on infrastructure and local capacity.

Integrated delivery of health interventions showed one of the strongest effects, reducing missed opportunities by 66 percent. The finding supports a basic but often neglected principle: vaccination should not sit apart from other child health services. When immunisation is integrated into nutrition services, sick-child visits and broader child health programmes, more eligible children can be reached.

The Integrated Management of Childhood Illness approach was especially relevant because it links preventive and curative care. If every contact with a child becomes a chance to check vaccination status, health systems can capture children who may otherwise fall through routine schedules.

Pharmacist involvement also reduced missed opportunities, with the review finding a 57 percent risk reduction. Pharmacists can screen records, identify due or delayed vaccines, support catch-up planning, manage stock and work with clinicians to reduce errors. Their inclusion points to a wider lesson: vaccination should be treated as a team-based service, not as the responsibility of one cadre alone.

Other interventions also showed benefits. Multicomponent interventions, including calls, postcards, outreach and caregiver education, reduced missed opportunities. Combined vaccines reduced missed opportunities by simplifying schedules and lowering the number of injections required during a visit. Financial incentives also showed a statistically significant reduction, though the effect was smaller.

SMS and phone reminders showed possible benefit, but the overall result was not statistically significant. The evidence was also highly variable, meaning these tools may work better when combined with other strategies rather than used alone.

Why it matters for immunisation policy

The findings clearly suggest that vaccine supply alone is not enough. Children can enter the health system and still leave unprotected if clinics lack screening routines, functioning records, trained staff and integrated care pathways.

For governments and immunisation programmes, the study points toward a layered strategy. Health worker education should be treated as a foundation, especially because provider-side failures are a major cause of missed opportunities. Digital registries and alerts should be expanded where feasible, but they must be paired with reliable workflows, updated vaccine schedules and staff trained to respond to alerts.

Integrated child health services should also become a priority in resource-limited settings, where families may have fewer chances to return for separate vaccination visits. Every health contact, whether for illness, nutrition or routine care, should be used to check immunisation status and provide due vaccines.

The authors note that the strength of the evidence ranged from very low to moderate, and many studies came from high-income countries, limiting how directly the findings can be applied to resource-limited countries, where missed opportunities are often more common and where health systems face different constraints.

The policy priority is therefore twofold: implement the most promising interventions while generating stronger evidence in the places where the burden is highest. Well-designed studies are needed in low- and middle-income countries to test context-specific combinations of education, digital alerts, integrated services, outreach and workforce changes.