Shellfish allergies are among the most common type of food allergy but a U.S. study has found that sufferers may possibly build up a tolerance to shrimp and possibly lobster and clams as they grow older.
Shellfish allergies tend to persist into adulthood, with reactions ranging from mild symptoms, like nasal congestion and hives, to serious or even life-threatening problems such as airway constriction, but little has been known about how children and adults differ in the immune response to shrimp proteins.