‘Black death’ survivors had plague-resistant genes that may boost their descendants’ risk of autoimmune disease

Survivors of the Black Death passed plague-resistant genes down to their descendents. But these genes may make modern carriers more susceptible to some autoimmune diseases, a new study of ancient DNA suggests. The Black Death, a 14th century pandemic of bubonic plague caused by the bacterium Yersinia pestis, killed an estimated 30% to 50% of […]