The body causes an allergic reaction by the production of antibodies to the shellfish protein (allergen). There are several types of shellfish, and each kind contains different allergy-causing proteins. Some people are allergic to only one type of shellfish, but can eat others. However, some people with a shellfish allergy must avoid all shellfish.
Also be sure to avoid iodine. I know someone who is allergic to shrimp and she did not tell her surgeon and used iodine on her skin for the prep and she swelled up and broke out into a rash. Needless to say surgery was postponed and she got an earful from her doctor about not telling him she was allergic to shrimp.
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