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US officially added to WHO list of countries affected by poliovirus outbreak

US officially added to WHO list of countries affected by poliovirus outbreak

Enlarge / A Pakistani health worker administers polio vaccine drops to a child during an immunization campaign in Karachi December 10, 2018. Pakistan is one of only two countries in the world where polio remains endemic. The United States, one of the wealthiest and most developed countries in the world, has met the World Health …

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