Genes that protected people against the Black Death 700 years ago now increase your risk of Crohn's disease and rheumatoid arthritis, a new study has revealed.Scientists looked at DNA extracted from the teeth of people who died before, during and after the devastating bubonic plague, which swept through Europe, and Africa from 1346 to 1353. Their results revealed that a gene variant called ERAP2 was protective against the plague in the Middle Ages.
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