Childhood immunization is a highly cost-effective public health intervention, but reaching zero-dose children in the most remote and conflict-affected areas requires dedicated investment. Supporting local partners is crucial for successful delivery.

<p>Childhood immunization is the world’s most cost-effective public-health intervention, with a single vaccine dose costing less than $2 to administer—even in active conflict zones. But local delivery in the hardest-to-reach places, where zero-dose children are concentrated, requires investment in models that depend on local partners.</p>