I managed to develop an allergy to prawns a couple of years ago, after eating them all my life.
I had some king prawns and went into mild anaphylaxis. So I gave them up.
Then, twice, prawns of normal size brought me out in red lumps, swelling and difficulty breathing. Most of the time they weren't a problem. The doctor surmises that I'm either allergic to the preservatives, or to some sort of plankton that the prawns eat. So no more prawns at all any more...
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