Allergens are microscopic particles that are inhaled through the nose and mouth.
An inflammation of the nasal passages that is caused by a specific allergen. A mixture of allergen extracts, such as cat hair, dust mites, and molds, individually developed for specific types of allergies. Special proteins that build in the blood as a response to foreign substances. It is thought that injections of a specific allergen can cause a protective antibody to build in the blood, which lessens or prevents allergic symptoms. A substance which, when present in the body, will cause the building of antibodies, thereby causing a protective response to a disease or an illness.