Outbreaks of vaccine-preventable diseases such as measles, meningitis and yellow fever are rising globally, and diseases like diphtheria, that have long been held at bay or virtually disappeared in many countries, are at risk of re-emerging. In response, the agencies are calling for urgent and sustained political attention and investment to strengthen immunization programmes and protect significant progress achieved in reducing child mortality over the past 50 years.
Measles is making an especially dangerous comeback. The number of cases has been increasing year on year since 2021, tracking the reductions in immunization coverage that occurred during and since the COVID-19 pandemic in many communities. Measles cases reached an estimated 10.3 million in 2023, a 20% increase compared to 2022.
Meningitis cases in Africa also rose sharply in 2024, and the upward trend has continued into 2025. In the first three months of this year alone, more than 5500 suspected cases and nearly 300 deaths were reported in 22 countries. This follows approximately 26 000 cases and almost 1400 deaths across 24 countries last year.
These outbreaks come amidst global funding cuts. A recent WHO rapid stock take with 108 country offices of WHO – mostly in low- and lower-middle-income countries – shows that nearly half of those countries are facing moderate to severe disruptions to vaccination campaigns, routine immunization and access to supplies due to reduced donor funding. Disease surveillance, including for vaccine-preventable diseases, is also impacted in more than half of the countries surveyed.
“The global funding crisis is severely limiting our ability to vaccinate over 15 million vulnerable children in fragile and conflict-affected countries against measles,” said UNICEF Executive Director Catherine Russell. “Immunization services, disease surveillance, and the outbreak response in nearly 50 countries are already being disrupted – with setbacks at a similar level to what we saw during COVID-19. We cannot afford to lose ground in the fight against preventable diseases.”
How immunization addresses these challenges
Joint efforts by WHO, UNICEF, Gavi and partners have helped countries expand access to vaccines and strengthen immunization systems through primary health care, even in the face of mounting challenges. Every year, vaccines save nearly 4.2 million lives against 14 diseases – with nearly half of these lives saved in the African Region.
Progress has also been made in reducing yellow fever cases and deaths through increasing routine immunization coverage and emergency vaccine stockpiles, but recent outbreaks in Africa and in the Region of the Americas highlight the risks in areas with no reported cases in the past, low routine vaccination coverage and gaps in preventive campaigns.
Another milestone is the sub-national introduction of malaria vaccines in nearly 20 African countries, laying the foundation to save half a million additional lives by 2035 as more countries adopt the vaccines and scale-up accelerates as part of the tools to fight malaria.
Call to action
As part of integrated primary health-care systems, vaccination can protect against diseases and connect families to other essential care, such as antenatal care, nutrition or malaria screening. Immunization is a ‘best buy’ in health with a return on investment of $54 for every dollar invested and provides a foundation for future prosperity and health security.
Gavi’s upcoming high-level pledging summit taking place on 25 June 2025 seeks to raise at least US$ 9 billion from our donors to fund our ambitious strategy to protect 500 million children, saving at least 8 million lives from 2026–2030.
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About UNICEFUNICEF works in some of the world's toughest places, to reach the world's most disadvantaged children. Across more than 190 countries and territories, we work for every child, everywhere, to build a better world for everyone. For more information about UNICEF and its work, visit: www.unicef.org.
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