A child's first vaccines should never depend on a mother's schooling or a family's income — yet WHO's decade-long evidence across 92 low- and middle-income countries shows they still do.

The Core Finding: Two Inequalities That Refuse to Close

Using nationally representative household survey data from up to 92 low- and middle-income countries, the authors assessed vaccine equity and inequalities in nine childhood immunization indicators between 2004–2013 and 2014–2023. They find that economic- and education-related inequalities in childhood immunization within these countries have persisted over the past decade. Overall, differences in vaccination coverage by child sex, mother's age, and urban versus rural residence were small or absent. In contrast, inequalities related to maternal education and household economic status were substantially larger. For immunization coverage indicators, the median difference between children of the most and least educated mothers ranged from 9 to 14 percentage points across countries, indicating a consistently sizable education-related coverage gap. [4] 

Maternal Education: A Powerful Determinant of Childhood Vaccination

The clearest signal in the analysis concerns maternal education. Across low- and middle-income study countries, the median prevalence of non-receipt of all four core childhood vaccines (BCG, DTP, measles, and polio) was 9.3% among children of mothers in the least educated group, compared with 3.0% among those in the most educated subgroup. Put differently, children whose mothers had the lowest level of schooling were roughly three times as likely to have missed every one of these basic vaccines that protect against vaccine-preventable diseases. Using a population-attributable risk approach, the authors estimated how national zero-dose DTP prevalence would change if education-related inequality were eliminated; in 14 African countries, including Cameroon, Chad, Nigeria, Mali, and Zambia, zero-dose prevalence would fall by at least half under this scenario. [4]

The Poverty Penalty: Where a Child Is Born Still Shapes Their Chances of Protection

Household wealth shows a pattern similar to maternal education, in shaping vaccination coverage rates, with the heaviest burden falling on children in the poorest countries. Across country income groups, overall economic related inequality in childhood immunization was consistently larger in low‑income countries than in lower‑middle‑ and upper‑middle‑income countries for every indicator examined. In these low‑income settings, the gap between the poorest and richest households is substantial. Among 20 low‑income study countries, the median difference in zero‑dose DTP prevalence between the poorest and richest subgroups reached 11.8 percentage points. These results underline how strongly a child's chances of receiving basic vaccines still depend on being born into a wealthier household in a better‑resourced health system. [4] 

The economics behind this divide are stark. Sub-Saharan Africa, the region with both the lowest immunization coverage and the widest economic gaps, spends only a fraction per person on health compared with wealthy regions: roughly US$92 per capita in 2021, about one-fifth of even the next-lowest world region. [5] 

A disparity of this order, spotlighted at the 2025 Global Digital Health Forum as a gap of up to 69-fold between sub-Saharan Africa and Europe. [6] This means that in the very places where the poorest children are most likely to miss their vaccines, health systems have the least to work with. That makes low-cost, high-leverage solutions not a luxury, but a necessity. 

A Glimmer of Progress — but Not Everywhere

Perhaps the study's most important message is about momentum. Overall, within-country inequalities barely moved over the past decade, with only modest reductions in a few specific cases, on the order of 2 to 3 percentage points over ten years, for example, in economic- and residence-related inequality in DTP3 coverage. A decade ago, these gaps appeared to be narrowing; that progress has now largely stalled. But once again, national averages hide encouraging exceptions. Among 17 low-income countries in the WHO African Region, the median education gap in DTP3 coverage narrowed meaningfully, from 16.0 down to 10.3 percentage points, over the decade. Countries, including Burundi, Chad, Liberia, Togo, and Uganda, saw inequality fall, with real coverage gains among the least-educated families. At the same time, Burkina Faso, The Gambia, and Rwanda maintained coverage above 85% across all subgroups. The lesson is decisive: where programs deliberately target the disadvantaged and prioritize immunization equity, the gap closes. Stagnation is not destiny. [4] 

What WHO Recommends — and a Blueprint You May Recognize

The study points toward clear solutions. In 2025, WHO and UNICEF called on governments and development partners to address immunization inequality through: strengthening immunization in conflict and fragile settings; embedding immunization within primary health care systems; countering vaccine misinformation and vaccine hesitancy; and investing in strong data and disease surveillance systems. [7-8] 

Evidence supports the view that the most effective approaches are comprehensive. [9] Another study found that comprehensive multi-component interventions were most effective, including improving access, appointment reminders, education, and tailored health communications. [10] This is the precise blueprint CIMA Care built to deliver. 

The Prize: What Equity Would Unlock

The authors then asked a powerful "what if": what would happen to national coverage and global vaccination coverage if every subgroup were vaccinated at the same rate as the most educated? The potential is enormous. In Angola, the Central African Republic, Chad, and Mozambique, national DTP3 coverage would rise by more than 20 percentage points; across 34 African countries, 10 would gain at least 10 points. For the zero-dose indicator, eliminating the education gap alone would at least halve the share of completely unvaccinated children in 14 countries. [4]

In other words, a large part of the world's remaining immunization gap is not a vaccine-supply problem, it is a vaccine equity problem. Doses exist. The challenge is reaching the least educated and poorest families with information, reminders, and trusted support. 

From Evidence to Action: How CIMA Care Closes These Exact Gaps

WHO identified four solution pillars. [7] CIMA Care operationalizes every one of them: 

• Tackling the education gap: Since a mother's knowledge is itself a determinant of her child's protection, CIMA Care's SMS system delivers WHO-, UNICEF-, and UNODC-validated health messages to parents in their own languages, building vaccine understanding precisely where formal education is lacking. [11] 
• Reaching the poorest and the zero-dose child: According to Dr. Cornelius Chebo, EPI Coordinator for the Northwest Region of Cameroon, CIMA Care's automated reminder SMS systems showed a 99% success rate in defaulter reductions. Moreover, Cima Care's defaulter identification and geographic heat-mapping tools enable health workers to find and follow up with the exact children that national averages hide, the poorest, the missed, the unprotected. [12- 13] 
• Strengthening fragile and conflict settings: With offline functionality and rapid deployment, CIMA Care delivered a 23% improvement in vaccination uptake in conflict-affected Bamenda, Cameroon, and a 19% improvement in Jordan's Zaatari refugee camp, proven results in precisely the fragile contexts WHO prioritizes. [14] 
• Empowering the workforce:Through CIMA Care Health Academy, over 4,000 enrollments across 77+ countries have equipped healthcare professionals with CPD-certified training to deliver equitable, evidence-based immunization care. [15] 

And because economic inequality drives the largest gaps, CIMA Care Health Academy applies equity pricing aligned with World Bank income classifications, extending discounts of up to 90% to professionals in low-income nations, ensuring knowledge reaches where the burden is heaviest. [16] 

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