Sens communA substance (very often a protein) alien to the human body and that can cause an allergy when it enters it (possible ways: ingestion, injection, inhalation...). Seafood (crustaceans, but also molluscs, often seashells and even fish, often scombridae and Gadidae) contain allergens to which some consumers are sensitive. There might be cross-reactivity between some allergens.
According to Ifremer
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