Of the 18.3 million children reached between 2023 and 2025, an estimated 12.3 million were “zero-dose children” who had not yet received a vaccine and 15 million had never received a measles vaccine. BCU also provided 23 million doses of inactivated polio vaccine (IPV) to un- and under-vaccinated children, an essential intervention to reach polio eradication. Programme implementation concluded on 31 March 2026. Although final data is still being compiled, the global initiative is forecasted to be on track to meet its target of reaching at least 21 million un- and under-immunized children.
Beyond pandemic recovery, the BCU initiative focused on closing the vaccine equity gap. Millions of children every year miss the essential vaccinations they should receive before the age of one. Most of them live in fragile, conflict-affected, or underserved communities and are never caught up as they grow older.
BCU catalysed long-lasting systems to identify, screen, vaccinate and monitor coverage rates in these older children – including updates to policies on age eligibility. Countries also oriented and trained health workers to identify, screen and vaccinate missed children as part of routine care and engaged with communities and civil society to support catch-up efforts. By expanding the reach of immunization to millions of previously missed children and their communities, and investing in systemic improvements, the BCU drive has made it easier for the countries to ensure these populations and others like them continue to receive essential health and immunization services in the future.
While these 36 countries received Gavi funding and technical assistance from WHO and UNICEF through BCU, many other countries also implemented activities during this period to accelerate efforts to catch-up missed children and recover immunisation services following pandemic-related backsliding.
"By protecting children who missed out on vaccinations because of disruptions to health services caused by COVID-19, the Big Catch-Up has helped to undo one of the pandemic's major negative consequences," said Dr Tedros Adhanom Ghebreyesus, Director-General of the World Health Organization. “The success of the Big Catch-Up is a testament to health workers and national immunization programmes, which are now better equipped to find and vaccinate children missed by routine services."
Looking at the challenges ahead
Through the Big Catch-Up, for the first time ever, countries and global partners successfully reached 12.3 million “older” zero dose children between the ages of 1 to 5. However, in 2024, an estimated 14.3 million infants under the age of one globally failed to receive a single vaccine through routine immunization programmes. Despite BCU demonstrating progress is possible with leadership and targeted investment and support, lowering this annual number of infants who miss out will require building systems that consistently reach the hardest to reach communities – against a backdrop of rising birth cohorts, conflict and displacement, funding cuts, and strained health systems.
Large-scale catch-up efforts are resource intensive and should serve only as a gap-filling measure that is complementary to routine immunization. Timely vaccination according to national immunisation schedules provides optimal protection and continues to be the most sustainable way to safeguard children and communities.
For every generation, vaccines work
Notes to editors
Photos and broll - UNICEFWHO catch up immunisationThe Big Catch-Up: An Essential Immunisation Recovery Plan for 2023 and BeyondAbout Gavi, the Vaccine Alliance
About Gavi, the Vaccine Alliance
Gavi, the Vaccine Alliance is a public-private partnership that helps vaccinate more than half the world’s children against some of the world’s deadliest diseases. The Vaccine Alliance brings together developing country and donor governments, the World Health Organization, UNICEF, the World Bank, the vaccine industry, technical agencies, civil society, the Gates Foundation and other private sector partners. View the full list of donor governments and other leading organisations that fund Gavi’s work here.
UNICEF, the United Nations agency for children, works to protect the rights of every child, everywhere, especially the most disadvantaged children and in the toughest places to reach. Across more than 190 countries and territories, we do whatever it takes to help children survive, thrive, and fulfil their potential.
About WHO
Dedicated to the health and well-being of all people and guided by science, the World Health Organization leads and champions global efforts to give everyone, everywhere, an equal chance at a safe and healthy life. We are the UN agency for health. We connect nations, partners and people on the front lines in 150+ locations – leading the world’s response to health emergencies, preventing disease, addressing the root causes of health issues and expanding access to medicines and health care. Our mission is to promote health, keep the world safe and serve the vulnerable. www.who.int
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