[ajuc]

It would be extremely unlikely for ancient (millions years old) organism to be better at penetrating human immune system than organisms that evolved in arms race with us.

It's like taking a DOS virus and expecting it to infect iphones :)

[piker]

Is it true that the human "OS" (i.e., genome) has changed that radically?

[ajuc]

Depends how far back "ancient" is. But most sicknesses only infect closely related species, and homo sapiens is here for maybe 100 000 years, so I wouldn't be too worried.

On the other hand I'm very afraid what will happen when people can download, tweak, and 3d-print viruses as a hobby.