is a greek word meaning 'a strange disease'. Modern usage tends to confine it to IgE mediated allergic responses. Most often manifested as a skin or mucous membrane response as against a generalised body response. An atopic individual is generally considered to be a person who has a genetic disposition to allergy.
the hereditary predisposition to develop allergies such as asthma, hay fever (or pollinosis), urticaria, eczema (so called "atopic" dermatitis), certain other types of rhinitis and conjunctivitis as well as different food allergy reactions.
The state of having one or more of a defined group of diseases-allergic rhinoconjunctivitis, allergic asthma, and atopic dermatitis-that are caused by a genetic propensity to produce immunoglobulin E (IgE) antibodies to environmental allergens encountered through inhalation, ingestion, and possibly, skin contact. A broader definition, sometimes used for epidemiologic studies, requires only the presence of IgE antibody, regardless of allergic disease.
Atopy (Greek Î±Ï„Î¿Ï€Î¯Î± - placelessness) or atopic syndrome is an allergic hypersensitivity affecting parts of the body not in direct contact with the allergen. It may involve eczema (atopic dermatitis), allergic conjunctivitis, allergic rhinitis and asthma. There appears to be a strong hereditary component.