Bill and Melinda Gates to pay off Nigeria’s $76 million polio debt

Nigeria, which accounted for more than half of all polio cases in 2012, reported zero new cases of the infectious disease in 2017. 

UNICEF health consultant Hadiza Waya (R) tries to immunize a child during a vaccination campaign against polio in northwest Nigeria. (Photo: Pius Utomi Ekpei/AFP/Getty Images)

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