>>>You also can't say that it is only a matter of time before airborne
>>>strains of Ebola occur. You do not know that for a fact. They could
>>>have been airborne way back down the evolutionary ladder and it wasn't
>>>a good strategy so the virus evolved other modes of transmission.
more hardy than the average virus.
Maybe it wasn't a good evolutionary strategy a few 1000 or million years ago
but it might be now. Just because it hasn't become airborne recently (I mean
that in the evolutionary time scale) it might still retain the genetic
information to do so.