A child in Kawo Kano, Nigeria, receives a polio vaccine. Nigeria celebrates its first year with no new case of polio.
A child in Kawo Kano, Nigeria, receives a polio vaccine. Nigeria celebrates its first year with no new case of polio. Sunday Alamba 2014 AP FILE PHOTO
A child in Kawo Kano, Nigeria, receives a polio vaccine. Nigeria celebrates its first year with no new case of polio. Sunday Alamba 2014 AP FILE PHOTO