[generic92034]

No, in fact Ebola is not quite so deadly (from WP):

"It kills between 25% and 90% of those infected – about 50% on average."

Even if it was airborne and very infectious it would not render an extinction event. It could possibly destroy civilization, though.

> However all of that is irrelevant since the GP was musing on the “huge genetic diversity of humans” being a barrier to xenomutation of animal viruses to humans.

No, you misunderstood. This was only meant regarding the ability of any virus to cause an extinction event. This was not applied to crossing the human-animal barrier.