Anyone who wants to know more about the nature of the deadly Ebola virus that we are hearing about in Nigeria and neighboring countries might like to read a book called "The Hot Zone."
"The Hot Zone" is a true and frightful story of what Ebola is like and what it can do, written by Richard Preston. I read it when it first came out about 20 years ago.
I believe that the most plausible theory of the origin of Ebola held that the virus was carried by infected gorillas or other apes, some of whom, although carriers, were themselves immune to the disease.
As I recall, the only "good" news about Ebola was that, while extremely contagious, it may not spread easily, because it is so deadly anyone afflicted with it dies promptly, usually within a day or two, with little opportunity to pass the disease on to other human beings. I do recall the book saying, however, that the virus lives on and predicting that it would be back.
Daniel Hoyt Daniels