contact allergy

allergy /al·ler·gy/ (al´er-je) a hypersensitive state acquired through exposure to a particular allergen, reexposure bringing to light an altered capacity to react. See hypersensitivity. aller´gic

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atopic allergy  atopy.

bacterial allergy  specific hypersensitivity to a particular bacterial antigen.

bronchial allergy  atopic asthma; see 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.

contact allergy  see under dermatitis .

delayed allergy  see under hypersensitivity.

drug allergy  an allergic reaction occurring as the result of unusual sensitivity to a drug.

food allergy , gastrointestinal allergy allergy produced by ingested antigens in food, usually manifested by a skin reaction.

hereditary allergy  atopy.

immediate allergy  see under hypersensitivity.

latent allergy  that not manifested by symptoms but which may be detected by tests.

physical allergy  a condition in which the patient is sensitive to the effects of physical agents, such as heat, cold, light, etc.

pollen allergy  hay fever.

polyvalent allergy  see pathergy (2).

spontaneous allergy  atopy.

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contact allergy

n.

A cutaneous hypersensitivity caused by direct contact with an antigen.

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contact allergy,

hypersensitivity to a substance that produced a reaction in a previous contact or that is structurally similar to another substance that produced such a reaction. Substances that can cause a contact allergy include poison ivy, metals, detergents, cosmetics, foods, and topical medicines.

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contact

1. a mutual touching of two bodies or animals.

2. an animal known to have been sufficiently near an infected animal to have been exposed to the transfer of infectious material.

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contact activation

the initiation of the intrinsic pathway of coagulation that occurs when whole blood contacts glass or similar surfaces; involves the conversion of factor XII into its active form, factor XIIa. This subsequently converts factor XI to XIa and so the coagulation cascade begins.

contact allergy

see contact dermatitis (below).

bone contact repair

repair of a fracture by contact apposition of the two fracture surfaces.

contact dermatitis

is caused by direct contact between the skin and a substance which is irritating or to which the animal is allergic or sensitive. The reaction usually occurs only on that area of the body that has come into contact with the substance. See also allergic contact dermatitis.

direct contact, immediate contact

the contact, by sharing the same accommodation or pasture or group, of a healthy animal with an animal having a communicable disease, the disease being transmitted as a result. See also contact transmission.

contact healing

a form of primary bone healing at a fracture site where there is cortical bone in contact.

contact hypersensitivity

see allergic contact dermatitis.

indirect contact

that achieved through some intervening medium, as propagation of a communicable disease through the air or by means of fomites or another animal, e.g. an infection may be passed to animal A from animal B via animal C; animal C is an indirect contact.

contact irritant dermatitis

skin disease produced by contact with an irritating substance; in contrast with allergic contact dermatitis, an immune reaction is not involved.

mediate contact

indirect contact.