13.5 million children. Zero vaccines. One decade to act. That number is not just a statistic. It represents the most marginalized children. Those invisible to the health systems. Missed by outreach services. Absent from household registers. I’m sharing a comprehensive slide deck: Zero-Dose Children: Identifying and Reaching the Unreached. It covers: Who zero-dose children areFive complementary data sources, from household surveys to geospatial mapping, and why triangulation i