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The World Health Organization has a five-year plan—one that it hopes will help billions of people obtain universal health coverage, be taken care of in health emergencies, and enjoy better health overall. To that end, the WHO has whittled down the world's biggest health challenges, coming up with a top 10 list of issues that need immediate addressing. Here, the problems we need to come together on en masse sooner rather than later, including "vaccine hesitancy."
