[ClearCase_guy]

it is only in Europe that this genetic mutation can be found

This argues against their case. The Black Death devastated India, China and the Middle East as well as Europe. If the genetic mutation is only in Europe, I'd say it has no correlation to any ancestors surviving the plague.

[shubi]

The virus may not have implanted the mutation in the other areas. It would be a rather rare event. But there is substantial evidence that shows that viri have caused several mutations in humans.

[Servant of the 9]

it is only in Europe that this genetic mutation can be found

This argues against their case. The Black Death devastated India, China and the Middle East as well as Europe. If the genetic mutation is only in Europe, I'd say it has no correlation to any ancestors surviving the plague.

Bubonic Plague devastated India, China and the Middle East as well as Europe, but they are saying that is a different disease than the Black Death.

So9