I was listening to the radio a few nights ago and the commentator was mentioning that the people who survived the plague identified the gene that gave them that ability and today people with that gene are more likely to have autoimmune diseases.
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Summary: People with selected variants of the ERAP2 and TICAM2 genes were 40% more likely to survive the Black Death, researchers discovered. However, in modern humans, those with the ERAP2 gene are more likely to suffer autoimmune disorders such as Crohn's disease.
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https://neurosciencenews.com/genetic-plague-autoimmune-22039/#:~:text=Summary%3A%20People%20with%20selected%20v ariants,disorders%20such%20as%20Crohn's%20disease.