The difference this time is our luck finally ran out. It jumped from small isolated villages where it quickly outstripped the number of victims, to huge mobile urban populations where it has plenty of fresh victims. That’s the difference this time.
http://www.cbsnews.com/news/ebola-outbreak-could-be-much-worse-than-thought/
You are right about the urban difference. I hope it dies down quickly. It is a horrific disease.