The Big Catch‑Up, a global effort to reverse COVID‑19–related declines in vaccination, has reached an estimated 18.3 million children aged 1-5 in 36 countries, delivering over 100 million life‑saving vaccine doses.
Of those, an estimated 12.3 million children had never received a vaccine, and 15 million had never had a measles vaccine www.who.int/news/item/24-04-2026-largest-c...
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