BBC sounds, Rutherford and Fry did a really good investigation on this a couple of weeks ago. https://www.bbc.co.uk/sounds/play/m001byym?partner=uk.co.bbc&origin=share-mobile
Tl;Dr you either didn’t come into contact with the thing when you were young so your body doesnt know its ok, or you got ill and ate that thing at the same time and your body thinks that thing is the reason you got ill, therefore will fight it off in the future.
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