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Edition #19 · Friday, May 15, 2026 · 1323 positive stories
Science & Breakthroughs

The Big Catch-Up vaccinated 18 million children in two years

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The Big Catch-Up vaccinated 18 million children in two years

BY THE OPTIMIST DAILY EDITORIAL TEAM Before any vaccine can protect a child, someone has to reach them. Around 12.3 million of the children covered by the Big Catch-Up had never received a single dose of anything: not measles, not polio, not diphtheria. They are known as zero-dose children, and the reasons they go unvaccinated are rarely simple. They live in conflict zones, remote areas, or communities where health systems have never been reliable, or where vaccination services collapsed during

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About Science & Breakthroughs coverage

The science section covers breakthroughs in medicine, physics, biology, and technology. We surface discoveries that expand what humanity can do, from new treatments reaching clinical trials to engineering feats that seemed impossible a decade ago. Every link goes to the original publisher so you can read the full study or press release yourself.

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