Ebola: Eight facts about American perception and West African reality

Northeastern University Professor Alessandro Vespignani creates models with data about, for example, air travel. Ebola may be headed next to Gambia, Ghana and Senegal, his research shows. “There is a tangible risk of spreading in the region to other countries,” Vespignani told National Public Radio, “probably in the ballpark of 20 to 30 percent in the next few weeks.”