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FILE- In this Sunday, April 13, 2014 file photo, an unidentified health official administers a polio vaccine to a child in Kawo Kano, Nigeria. Nigeria has reported the first two cases of polio after more than two years, in an area newly liberated from Islamic extremists who attacked polio vaccinators in the past, the government and the World Health Organization said Thursday. Aug. 11, 2016 (AP Photo/ Sunday Alamba, File)

FILE- In this Sunday, April 13, 2014 file photo, an unidentified health official administers a polio vaccine to a child in Kawo Kano, Nigeria. Nigeria has reported the first two cases of polio after more than two years, in an area newly liberated from Islamic extremists who attacked polio vaccinators in the past, the government and the World Health Organization said Thursday. Aug. 11, 2016 (AP Photo/ Sunday Alamba, File)

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