Introduction

In 1979, fewer than two in every hundred Bangladeshi children received a full course of routine vaccines.1 Measles, tetanus, diphtheria, and whooping cough were among the leading causes of death before a child's fifth birthday. Today, the picture is transformed: more than four in five children are now fully immunized through the country's Expanded Programme on Immunization (EPI).2

This shift represents one of the most consequential — and cost-effective — public health investments in the nation's history. In this article we draw together survey, administrative, and modelling data to quantify how many lives childhood immunization has saved, and to identify the districts where progress still lags.

Key insight
~2% → 84%
Full immunization coverage among Bangladeshi children rose from under 2% in 1979 to roughly 84% in 2024 — among the fastest sustained gains recorded in South Asia.

The introduction of routine vaccines led to a sharp rise in coverage

When the EPI launched in 1979, delivery was limited to a handful of urban facilities. The programme's nationwide expansion through the 1980s and 1990s — combined with community health workers and door-to-door outreach — drove coverage upward at a remarkable pace.3

Full childhood immunization coverage in Bangladesh, 1985–2024
Share of children aged 12–23 months who received all EPI vaccines (%)
Source: Bangladesh EPI Coverage Evaluation Surveys; Demographic & Health Surveys (1985–2024). Data for children aged 12–23 months.

The steepest climb occurred between 1985 and 1990, when coverage leapt from near zero to over half of all children in just five years — a mobilization effort widely studied as a model for low-income immunization programmes.4

How many lives has immunization saved?

Estimating lives saved requires comparing actual child mortality against a counterfactual in which vaccines were never introduced. Using WHO and IHME modelling frameworks applied to Bangladesh's demographic data, we estimate that routine childhood immunization prevents tens of thousands of under-five deaths each year.5

Estimated annual under-five deaths averted by routine immunization
Bangladesh, selected years · modelled estimate (thousands)
Source: DEP modelling based on WHO/IHME vaccine impact frameworks and Bangladesh under-five mortality data. Estimates are illustrative and carry modelling uncertainty.

Measles vaccination alone accounts for the largest single share of these averted deaths, consistent with global findings that the measles vaccine is among the highest-impact childhood interventions ever deployed.6

Where coverage gaps still remain

National averages mask important inequalities. Coverage in remote haor wetlands, coastal char lands, and the Chittagong Hill Tracts trails the national figure by ten percentage points or more.7 Seasonal flooding routinely disrupts cold-chain logistics and outreach sessions in exactly the districts where children are most vulnerable.

Urban slums present a distinct challenge

Rapid, unplanned urban growth has created pockets of low coverage within otherwise well-served cities, where migrant families fall outside routine registration systems. Closing these gaps will require microplanning that targets mobile and informal populations directly.8

Conclusion

Bangladesh's immunization story demonstrates that sustained, well-targeted public investment can deliver extraordinary returns in child survival even under significant resource constraints. The remaining task is one of equity: extending the same protection to the children currently left behind by geography and poverty. The data make the case plainly — every percentage point of coverage gained translates directly into lives saved.