What is the definition of cross-reactivity in the context of allergy?

An allergy is where your body reacts to something that's normally harmless like pollen, dust or animal fur. The symptoms can be mild, but for some people they ... Allergen: Any antigen that causes allergic reactions such as pollens, mites, foods,etc. Antibody: People produce these molecules in response to antigen ... Mar 7, 2025 ... The Asthma and Allergy Foundation of America is the nation's leading allergy and asthma charity, is dedicated to keeping 65 million people ... Jun 2, 2020 ... of Asthma and Allergies in Childhood) study definition or other comparable definitions), allergic rhinitis (doctor diagnosed or as defined ... AAAAI experts explain an allergic reaction occurs when the immune system overreacts to a harmless substance called an allergen. Feb 2, 2023 ... An allergen is a substance that can cause an allergic reaction. In some people, the immune system recognizes allergens as foreign or dangerous. Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms. An allergen is any normally harmless substance that causes an immediate allergic reaction in a susceptible person. Food allergens are almost always proteins ... Food allergies and food intolerances, like lactose intolerance, are not the same. Find out more. Allergies to tree nuts and peanuts are a common cause of severe allergic reactions. Find out more here about managing nut allergies.