An exaggerated response by the immune system to a foreign substance
An unusal or exaggerated allergic reaction. Anaphylaxis means the opposite of phylaxis or protection
Any of an order of highly specialized insects such as bees and wasps.
Body system responsible for combatting infection
Complex of events within the body that works toward the destruction or inactivation of pathogens, abnormal cells or foreign molecules.
Disease production agen or invading substance
Any posionous chemical secreted by bacteria or released following destruction of bacteria.
Immunity resulting from a direct attack of a forein substance by specialized cells of the immune system.
Immunity resulting from attack of invading substance by antibodies.
Principal agent of a chemical attack of an invading substance.
Alternative term for antibody.
Any substance that is capable, under appropriate circumatances, of inducing an immune response.
Initial, generalized response to an antigen.
Response by immune system that takes place if body is exposed to an antigen a second time. Antibodies are specific and nongeneralized.
Genetically predetermined immunity at birth. Innate immunity
Naturally Acquired Immunity
Immunity that begins the develop efter birth and is continually enhancedby exposure to new pathogens.
Induced Active Immunity
Immunity achieved through vaccination given to generate an immune response that results in development of specific antibodies for the injected antigen.
Acquired immunity that occured following exposure to an antigen and results in production of antibodies specific for that antigen.
Acquired immunity that results from administration of antibodies either from mother to the infant across the placental barrier (natural passive immunity) or through vaccination (induced passive immunity)
Initial exposure of a person to an antigen resulting in an immune response
An unexpected and exaggerated response to a particular antigen. Allergy
Hypersensitive state acquired through exposure to an antigen.
Delayed Hypersensitivity Reaction
A hypersensitivity reaction that takes place after an elapse of some time following reexposure to an antigen. Usually less severe.
Immediate Hypersensitivity Reaction
A hypersensitivity reaction that occures swiftly following reexposure to an antigen. Immediate hypersensitivity reactions are usually more severe than delayed reactions. The swiftest and most severe of such reactions is anaphylaxis.
A substance capable of inducing allergy of specific hypersensitivity. Allergens may be protein or nonprotein. Most are protein.
Type of white blood cell that participates in allergic responses.
Specialized cell of the immune system that contains chemical that assist in the immune response
A product of mast cells and basophils that causes vasodilation, capillary permiability, bronchoconstiction, and contraction of the gut.
Marked edema of skin that usally involves head, neck, face and upper airway. Common manifestation of anaphylaxis.
Slow Reacting Substance of Anaphylaxis (SRS-A)
Substance released by basophils and mast cells that causes spasm of the bronchiole smooth muscle, resulting in an asthma like attack and occasionally asphyxia.
Raised areas, wheals, that occur on the skin associated with vasodilation due to histamine.