The viral polio disease has over the years crippled hundreds of thousands of children in Africa and other parts of the world but on August 25, four years after Africa’s last case was recorded in northern Nigeria, the
continent was  declared  free of wild polio. Still, vaccine-derived strains of the virus remain in more than a dozen African countries. Pakistan and Afghanistan are the only two countries in the world where the debilitating virus remains endemic. There is no cure for polio, but the disease can be prevented through the oral administration of a
vaccine.  

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