Allergen Cross-Reactivity

Allergen cross-reactivity occurs when the immune system mistakes proteins in one food or substance for similar proteins in another, leading to an allergic reaction. This happens because some proteins share structural features, causing the body to respond as if it’s encountering a familiar allergen. For example, someone allergic to birch pollen might react to apples because their proteins are similar. Cross-reactivity varies among individuals and allergens, meaning not everyone will react the same way. Understanding this helps identify potential risks and manage allergies effectively, especially when introducing new foods or in allergy testing.