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tampering t1_it0eiop wrote

Reply to comment by SemanticTriangle in Natural Selection Driven by the Black Death Linked to Modern-Day Autoimmune Disease: Analysis of DNA from over 200 remains shows that the Black Death selected for immune gene variants that are also risk factors for autoimmune conditions like Crohn's disease. by rjmsci

Probably not specific, but plague was so deadly that it killed a lot of people without the mutation, so it became more widespread in the population where there were high rates of bubonic plague.

Let's say hypothetically the mutation is also helpful against a common upper respiratory infection. but having it means you only have the sniffles twice a year versus three times a year. Lacking that sort of helpfulness doesn't prevent an individual from passing on their genes to the next gen.

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