Tekmira is furthest along in development of a vaccine/cure but is stuck in Phase I trials with FDA regulatory hurdles. Ebola is not always fatal this guy cured himself http://www.npr.org/blogs/goatsandsoda/2014/07/22/333628899/e...
I imagine there exist a portion of the population with a genetic mutation that is resistant to Ebola, considering it may have existed in the wild for a much longer period than its first description in the mid 70's.
Really? If we are speaking of the Black Death, I believe it returned every decade or so.