CrazyisNSFW t1_j77qfce wrote
Reply to comment by perta1234 in Why do some allergies get worse over time and some better? And how does allergen desensitivity work without making the reaction worse? by DontDoDrugs316
Just adding to your reply. I found this paper outlining different, competing hypotheses, and parasite hypothesis is only one of them:
The evolution of IgE-mediated type I hypersensitivity and its immunological value
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