Quote:
Originally Posted by Penforhire
You mean like avian flu, which DID jump species?
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Yeah, but only because lot of genetic material is same. Viruses need host with suitable material to transfer, they can't replicate by themselves they need host. Without common cell and proteins they can't do it. So alien virus which doesn't have link to same genetic material has no means to replicate inside human.
Whole Star Trek theory is bit questionable, how all the species reached same level in relatively same time, or how to different race can have childs... But on otherhand it's not anyway hard-scifi...