Crustaceans and molluscs are common food allergens. Allergies to crustaceans and molluscs typically involve a reaction to proteins found in these aquatic creatures. Crustaceans include shellfish like shrimp, crab, lobster, and crayfish, while molluscs include clams, mussels, oysters, scallops, and squid.
Cross-contamination is a significant concern for individuals with crustacean or mollusc allergies. Even small amounts of allergenic proteins can trigger a reaction, so strict avoidance is necessary.