The genetic stability of Ebola virus

[KMShannon]

If the Ebola virus' polymerase is attempting to preserve its genome over
time, what does that say for the natural selection forces that may act
upon Ebola?  I am curious about the evolution of other filoviruses and how
they compare to Ebola.  
Aside from this question, has a natural reservior or "jump" vector for
Ebola been discovered yet?
Kev
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|  Kevin Shannon, Univ. of Oklahoma                              | 
|  AOL-->KMShannon at aol.com                                       |
|  Internet-->KSHANNON at aardvark.ucs.uoknor.edu   |
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Kevin Shannon
AOL-->KMShannon
Internet-->KSHANNON at aardvark.ucs.uoknor.edu