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NPR: A $5.5 billion road map to banish polio forever

This trajectory is good news, says Dr. Walter Orenstein at Emory University, who has been working on polio eradication for years. But the job isn't finished, he says. "The last cases are the hardest," Orenstein tells Shots. "Obviously if they were easy, we would have gotten rid of those reservoirs a long time ago."

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