The Ebola outbreak currently ravaging West Africa likely started with a single infected person. This is actually good news because it meansthe current strain is descended from the original Ebola viral jump, and not new versions of the pathogen. It also means the current public health response is the right one.
http://www.scientificamerican.com/article/patient-zero-believed-to-be-sole-source-of-ebola-outbreak/
