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[Comment] Maternal, newborn, and child health and the Sustainable Development Goals—a call for sustained and improved measurement

Immunisation is one of the great global health successes of the past century, with millions of lives saved.1 Ensuring vaccination of millions of children is complex, but is made possible by one fundamental task: systematic counting at multiple levels and at frequent intervals. From charts in thousands of rural health posts, to databases in ministries of health, to standardised surveys and global reports from WHO, UNICEF, and GAVI, the Vaccine Alliance, a robust interconnected system of data collection and use enables health workers, programme managers, and global actors to track who is vaccinated and make course corrections as needed to improve performance, policies, and programmes.