delayed allergy


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de·layed al·ler·gy

a type IV hypersensitivity allergic reaction; so called because in a sensitized subject the reaction becomes evident hours after contact with the allergen (antigen), reaches its peak after 24-48 hours, then recedes slowly. Associated with cell-mediated responses.
See also: delayed reaction, delayed hypersensitivity. Compare: immediate allergy.

de·layed al·ler·gy

(dĕ-lād' al'ĕr-jē)
A type IV allergic reaction; so called because in a sensitized subject the reaction becomes evident hours after contact with the allergen (antigen), reaches its peak after 36-48 hours, then recedes slowly. Associated with cell-mediated responses.
See also: delayed reaction
Compare: immediate allergy

de·layed al·ler·gy

(dĕ-lād' al'ĕr-jē, dĕ-lād alĕr-jē)
A type IV hypersensitivity allergic reaction; in a sensitized patient, the reaction becomes evident hours after contact with the allergen, reaches a peak after 24 to 48 hours, then slowly recedes.

allergy

an altered reactivity following second or subsequent exposure to antigen (allergen). See also hypersensitivity, allergic.

atopic allergy
hereditary predisposition to develop certain allergies. See atopy.
bacterial allergy
a specific hypersensitivity to a particular bacterial antigen, e.g. Mycobacterium tuberculosis; it is dependent on previous infection with the specific organism.
bronchial allergy
asthma.
cold allergy
a condition manifested by local and systemic reactions, mediated by histamine, which is released from mast cells and basophils as a result of exposure to cold.
delayed allergy
see delayed hypersensitivity.
drug allergy
see drug allergy.
drying-off allergy
see milk allergy (below).
food allergy
called also gastrointestinal allergy; see food hypersensitivity.
gastrointestinal allergy
see food allergy (above).
hereditary allergy
an allergy with a hereditary predisposition. The tendency to develop some forms of allergy is inherited, but the specific clinical form is not. IgE, formerly called reagin or reaginic antibody, may be involved. See also atopy.
induced allergy
allergy resulting from the injection of an antigen, contact with an antigen, or infection with a microorganism, as contrasted with hereditary allergy.
inhaled allergy
see atopy.
milk allergy
a hypersensitivity to the milk protein, α-casein. Signs, varying from urticaria to anaphylaxis, have occurred in Jersey cows when milk escapes from the udder into the bloodstream during the drying off period.
physical allergy
a condition in which physical agents, such as heat, cold or light, trigger an allergic response.