A long-held myth of RCM allergy is that there is an association with shellfish allergy. This is a still believed by many people, even some physicians. RCM allergy is not really an allergic process at all, and probably not related to the iodine content. Shellfish allergy to due to proteins, not to iodine content. While it is possible to have reactions to both shellfish and RCM, there is no relationship between the two.
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