b'Disease X n. A dire contagion requiring immediate attention\\u2014but which we don\\u2019t yet know about. In 2013 a virus jumped from an animal to a child in a remote Guinean village. Three years later, more than 11,000 people in six countries were dead. Devastating\\u2014and Ebola was a well-studied disease. What may strike next, the World Health Organization fears, is something no doctor has ever heard of, let alone knows how to treat. It\\u2019s come to be known as Disease X.\\nLearn more about your ad choices. Visit podcastchoices.com/adchoices'