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The Big Catch-Up, a multi-year initiative launched during World Immunization Week 2023, delivered more than 100 million vaccine doses to an estimated 18.3 million children aged 1 to 5 across 36 countries between 2023 and 2025.

The Big Catch-Up, a multi-year initiative launched during World Immunization Week 2023, delivered more than 100 million vaccine doses to an estimated 18.3 million children aged 1 to 5 across 36 countries between 2023 and 2025.

Of the children reached, approximately 12.3 million had never received any vaccine, while 15 million had not previously received a measles shot. The program also administered 23 million doses of inactivated polio vaccine.

Of the children reached, approximately 12.3 million had never received any vaccine, while 15 million had not previously received a measles shot. The program also administered 23 million doses of inactivated polio vaccine.

The initiative, led by Gavi, WHO and UNICEF, is on track to meet its target of reaching at least 21 million under- or unimmunized children, though final data is still being compiled.

The initiative, led by Gavi, WHO and UNICEF, is on track to meet its target of reaching at least 21 million under- or unimmunized children, though final data is still being compiled.

The 36 participating countries, spanning Africa and Asia, account for roughly 60% of all zero-dose children globally. Twelve of those countries reported reaching more than 60% of zero-dose children under age 5 who had missed their first diphtheria-tetanus-pertussis dose.

The 36 participating countries, spanning Africa and Asia, account for roughly 60% of all zero-dose children globally. Twelve of those countries reported reaching more than 60% of zero-dose children under age 5 who had missed their first diphtheria-tetanus-pertussis dose.

Despite the campaign's progress, an estimated 14.3 million infants worldwide did not receive a single routine vaccine in 2024. Agencies warn that catch-up efforts alone are insufficient and that strengthening routine immunization systems remains the most sustainable approach.

Despite the campaign's progress, an estimated 14.3 million infants worldwide did not receive a single routine vaccine in 2024. Agencies warn that catch-up efforts alone are insufficient and that strengthening routine immunization systems remains the most sustainable approach.

Measles cases reached approximately 11 million globally in 2024, with the number of countries experiencing large outbreaks nearly tripling since 2021. Funding cuts to global health programs have also raised concerns about reversing immunization gains, with the U.S. having reduced financial support to Gavi.

Measles cases reached approximately 11 million globally in 2024, with the number of countries experiencing large outbreaks nearly tripling since 2021. Funding cuts to global health programs have also raised concerns about reversing immunization gains, with the U.S. having reduced financial support to Gavi.

100M Doses Reach 18M Unvaccinated Kids Worldwide

100M Doses Reach 18M Unvaccinated Kids Worldwide

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100M Doses Reach 18M Unvaccinated Kids Worldwide

100M Doses Reach 18M Unvaccinated Kids Worldwide

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