[Smokin' Joe]

Monkeys and humans do not necessarily have the same response to the virus. Ebola Reston killed all the monkeys--but the humans remained unaffected.

The only way to test a serum in humans (or a vaccine) would be to wait for an outbreak.

Then too, there is variance between this variety of Ebola and known varieties of roughly 3%, which can be significant. (That's roughly the variance between human and chimp DNA)

This is apparently a new (or formerly unknown) and more lethal form.

[Sacajaweau]

http://www.foxnews.com/health/2014/08/12/us-fast-tracking-process-toward-human-testing-ebola-vaccine/