“The 2014 Ebola outbreak in West Africa has killed more people than sum total of all the previous outbreaks since the virus was first identified in 1976. This video explains how it got so bad.”
In a word, geography. The geographic factors facilitated the diffusion of Ebola and have slowed down the preventative measure and limited their success. This shows how porous borders, cultural patterns of health care, limited facilities a low literacy rates all contribute to to creating this nightmare.