It is not so long ago since we are exposed to so many different viruses. I think way to less time for evolution to be effective. Our ancestors a few thousand y

It is not so long ago since we are exposed to so many different viruses. I think way to less time for evolution to be effective. Our ancestors a few thousand years ago still lived in largely isolated, at least not as extremely mobile and transcontinental communities as we do. And in terms of the number of generations, that is so few that we can say we are at the very beginning of an evolutionary development .