Why were Basque Country, Poland, Bohemia and Milan spared from the Black Death? – Part II

Many speculations came up regarding pollen count, population density, location and climate etc.

But how about this?

Geneticist Steven O’Brien investigates whether a genetic mutation that helped the inhabitants of a village called Eyam in Derbyshire survive the Black Death pandemic in the 14th century help scientists find a cure for AIDS.

What exactly was it that the survivors had in common?

Remember this?

Rh negatives resistant to chikungunya

The village from the video is Eyam in Derbyshire, England.

From Wikipedia:

Survival among those affected appeared random, as many who remained alive had close contact with those who died but never caught the disease. For example, Elizabeth Hancock was uninfected despite burying six children and her husband in eight days. The graves are known as the Riley graves after the farm where they lived.^[14] The unofficial village gravedigger, Marshall Howe, also survived, despite handling many infected bodies.^[16]

Back to Part I:

Why were Basque Country, Poland, Bohemia and Milan spared from the Black Death?