Health
Will the planet ever be free from the scourge of polio?
25 years ago, the Americas were declared polio-free. Most of the world followed 鈥� but a mutating vaccine and bioterrorism fears are undermining final success
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25 years ago, the Americas were declared polio-free. Most of the world followed 鈥� but a mutating vaccine and bioterrorism fears are undermining final success