The Big Catch-Up initiative delivered over 100 million vaccine doses to approximately 18.3 million children in 36 countries, significantly narrowing immunity gaps and addressing the decline in vaccinations due to the COVID-19 pandemic. This effort is crucial for developers and tech professionals as it highlights the need for sustainable technological solutions to improve routine immunization systems globally. Despite this success, ongoing challenges remain in reaching zero-dose children, particularly in conflict zones and underserved areas.
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