Allergen

An allergen is any substance that can cause an allergy. In technical terms, an allergen is an antigen capable of stimulating a type-I hypersensitivity reaction in atopic individuals through Immunoglobulin E (IgE) responses. Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections. However, some individuals may respond to many common environmental antigens. This hereditary predisposition is called atopy. In atopic individuals, non-parasitic antigens stimulate inappropriate IgE production, leading to type I hypersensitivity. Sensitivities vary widely from one person (or other animal) to another. A very broad range of substances can be allergens to sensitive individuals.

Read more about AllergenTypes of Allergies, Fungal Allergens, Common Allergens, Seasonal Allergies

Other articles related to "allergen, allergens":

How The MELISA Test Works
... (or memory lymphocytes) that have had prior contact with a given allergen ... individuals, an ongoing everyday exposure to allergens can induce the Type-IV hypersensitivity with a resulting allergic reaction ... A portion of the blood is kept intact (unexposed to allergens) to serve as a negative control ...
Skin Allergy Test - Process
... A microscopic amount of an allergen is introduced to a patient's skin by various means Prick test or scratch test pricking the skin with a needle or pin containing a small amount of the allergen ... to the skin, where the patch contains the allergen If an immuno-response is seen in the form of a rash, urticaria (hives), or (worse) anaphylaxis it can be concluded ... Further testing can be done to identify the particular allergen ...
Allergen - Seasonal Allergies - Treatment
... In the case of nasal symptoms, antihistamines are normally the first option ... They may be taken together with pseudoephedrine to help relieve a stuffy nose and they can stop the itching and sneezing ...
Garden Strawberry - Allergy
... Some research suggests that the allergen may be tied to a protein involved in the ripening of fruits, which was named Fra a1 (Fragaria allergen1) ... A virtually allergen-free cultivar named 'Sofar' is available ...
Wine Label - Wine Laws - Allergen Warnings
... labelling regulations have required an allergen warning to appear on wine labels since 2002 due to the use of egg whites, milk, and isinglass in the fining and clarifying of the wine ... occurs after the labels have been ordered, which could lead to allergen warnings on wines that have had no exposure to allergens ...