This is interesting, seems there are "plural" lab made Filoviruses:

The invention provides methods to prepare filovirus, e.g., Marburg virus and Ebola virus, from cloned DNA and compositions useful therefor. As described herein, a reverse genetics system was employed to generate filovirus, e.g., Ebola virus, from cloned cDNA. The genomic sequence was prepared by reverse transcription and amplification of viral RNA.

This system was also used to generate a mutant virus

Thus, the invention provides a composition comprising a plurality of filovirus vectors.
[link to www.google.com]

...also, research "virus like particles" for vaccines.

Which makes these recent CDC actions even more peculiar:

CDC changed their information about how Ebola can spread: They now admit “being within 3 feet” of an infected person or “being in the same room” with an infected person can allow the virus to infect someone else!

They also admit a person who is infected, but not yet showing symptoms, is contagious, and that a person can test negative in the early stages! (8/10/14)