The devastation of the plague pandemic left such an incredible genetic mark on humanity that it's still affecting our health nearly 700 years later.

Up to half of people died when the Black Death swept through Europe in the mid-1300s.

A pioneering study analysing the DNA of centuries-old skeletons found mutations that helped people survive the plague.

But those same mutations are linked to auto-immune diseases afflicting people today.

The Black Death is one of the most significant, deadliest and bleakest moments in human history. It is estimated that up to 200 million people died.

Researchers suspected an event of such enormity must have shaped human evolution. They analysed DNA taken from the teeth of 206 ancient skeletons and were able to precisely date the human remains to before, during or after the Black Death.

The analysis included bones from the East Smithfield plague pits which were used for mass burials in London with more samples coming from Denmark.