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I'm a bit skeptical, but researchers at McMaster University, in Canada, are linking autoimmune diseases to the bubonic plagues of the middle ages.
https://studyfinds.org/autoimmune-disease-black-death/
@Coctaanatis they're generally pretty careful about announcements, so. and given the long term effects of covid that we're seeing more and more of, it won't surprise me if their conclusion is vindicated.