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I don't think luck is involved. Ebola is _hard_ to transmit. It requires direct contact with body fluids. As we've already seen, health care workers are at some risk. The general public is not.>
>So you do not believe that the virus is capable of mutating?
Of course, it's capable of mutating. But Ebola has been around for decades and to the best of my knowledge, has never mutated to airborne transmission and apparently, that kind of mutation is non-trivial:
http://www.scientificamerican.com/article/fact-or-fiction-the-ebola-virus-will-go-airborne/Tamar