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Cell Activation: process consisting of increasing the physical or chemical properties of a cell through messenger compounds.
Challenge (Test): the aim of this test is to determine whether an antigen is indeed responsible for the allergy. The patient is placed in the presence of a suspected allergen and if the reaction occurs, it is concluded that the allergen used is indeed responsible for the cause. This test can be oral, nasal, or bronchial but in all cases, it is performed under strict medical monitoring.
Chemical Mediator: synonymous for chemical messenger, involves a specific compound secreted by a cell that produces an effect on neighboring cells or on distant cells in the body by means of being transported in the blood.
Climatotherapy: term used to designate everything regarding climatic SPAs, involving treatment by means of a favorable climate.
Cockroaches: insects that are active at night (Blattaria) with a flat body, often called a roach.
Congestion: abnormal accumulation of blood in a part of the body.
Conjunctivitis: inflammation of the conjunctiva (lining) of the eye and the inner aspects of the eyelids.
Cross Reaction: when two allergens have at least one component in common then they have a cross reaction. This reaction can occur between two allergens of the same nature (for example, food allergens) or between allergens of different nature (for example, an inhaled and a food allergen or a contact allergen).
Cromones: compounds which inhibit the activation of mast cells and the release of mediators by these cells.
Cytokines: compounds secreted by lymphocytes and macrophages and involved in the development and control of immune responses. These compounds are small proteins which act on various types of cells which have specific receptors for each of them. Certain cytokines are named after their main functions (for example, interferons or tumor necrosis factors) while others carry the generic name "interleukine" followed by a number, currently from 1 to over 20.