Experts say we are "due" for one. When it happens, they tell us, it will probably have a greater impact on humanity than anything else currently happening in the world.
원문출처 : http://www.cnn.com/2017/04/07/health/flu-pandemic-sanjay-gupta/index.html
원문출처 : http://www.cnn.com/2017/04/07/health/flu-pandemic-sanjay-gupta/index.html