For just more than two years, Nigerian health officials have been celebrating a country free of the paralyzing effects of the poliovirus.
원문출처 : http://www.cnn.com/2016/08/16/health/polio-nigeria-new-cases/index.html
원문출처 : http://www.cnn.com/2016/08/16/health/polio-nigeria-new-cases/index.html