The ESTIMATE project develops practical, reliable methods for estimating vaccination coverage in areas inaccessible due to insecurity or logistical challenges. In Somalia and Ethiopia, traditional household surveys are often unfeasible in such areas, leaving critical blind spots in immunisation data.

To address this, ESTIMATE tests innovative survey approaches to reach these populations. Each method is evaluated for accuracy, feasibility, acceptability, and cost-effectiveness, with the aim of informing national immunisation strategies in real-world humanitarian settings.

Alongside data collection innovations, ESTIMATE also explores how service coverage evolves as countries transition from mobile vaccination campaigns (such as outreach teams or health camps) to fixed-site routine services. Using spatial and programmatic data, the project models coverage gains and gaps across different delivery scenarios. These insights support Ministries of Health in designing sustainable immunisation systems that can continue reaching underserved communities as access improves.