Global Vaccination Initiative Reaches Millions of Previously Unvaccinated Children
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The Big Catch-Up, a multi-year global vaccination campaign, concluded its program implementation after delivering over 100 million doses to an estimated 18.3 million children. The initiative specifically reached approximately 12.3 million children who had never received any vaccine, addressing a critical gap widened by the COVID-19 pandemic. The campaign is on track to meet its final target of reaching at least 21 million children.
Facts First
- Delivered over 100 million vaccine doses to an estimated 18.3 million children in 36 low and lower-middle-income countries.
- Reached approximately 12.3 million 'zero-dose' children who had never received any vaccine, including for measles, polio, or diphtheria.
- Focused on conflict zones and remote areas where health systems are unreliable or collapsed during the pandemic.
- On track to meet its target of reaching at least 21 million children once final data is compiled.
- Included major efforts in Ethiopia and Nigeria, where millions of previously unvaccinated children received their first doses.
What Happened
The Big Catch-Up, a multi-year initiative backed by UNICEF, Gavi, and the World Health Organization (WHO), concluded its program implementation at the end of March 2026. The campaign launched in 2023 to address the disruption of routine immunization services caused by the COVID-19 pandemic. It delivered over 100 million doses to an estimated 18.3 million children in 36 countries, primarily low and lower-middle-income nations across Africa and Asia. Approximately 12.3 million of the children reached had never received a single dose of any vaccine, including measles, polio, or diphtheria. Fourteen of the participating countries are classified by Gavi as conflict-affected, including Afghanistan, Myanmar, Somalia, Sudan, Syria, and Yemen.
Why this Matters to You
While the direct impact may be geographically distant, the success of this global health effort contributes to a safer world for everyone. By reducing the pool of unvaccinated children, the initiative helps to slow the international spread of preventable diseases like measles, which saw approximately 11 million cases recorded in 2024. A decline in global outbreaks could reduce the risk of these diseases being imported into your community. Furthermore, the rebuilding of vaccination systems in fragile states may help to stabilize health infrastructure, which is a cornerstone of global stability and economic recovery.
What's Next
The initiative is on track to meet its final target of reaching at least 21 million children by the time final data is compiled. The challenge now is to sustain the gains made and transition these children into routine immunization programs to ensure they receive all necessary follow-up doses. Health authorities will likely need to continue targeted efforts in conflict zones and remote areas to prevent backsliding. The persistent global gaps in routine immunization mean similar catch-up efforts may be required in the future to prevent further large-scale outbreaks.