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Immediate-type hypersensitivity
Immediate-type hypersensitivity Hypersensitivity tissue reaction occurring within minutes after the interaction of antigen and antibody.
RELATED TERMS--------------------------------------
Hypersensitivity
State of reactivity to antigen that is greater than normal for the antigenic challenge; hypersensitivity is the same as allergy and denotes a deleterious outcome rather than a protective one.
Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.
Antigen
A substance which, when present in animal tissue, stimulates the production of antibodies
Antibody
An infection-fighting protein molecule in blood or secretory fluids that tags, neutralizes, and helps destroy pathogenic microorganisms (eg, bacteria, viruses) or toxins. Antibodies, known generally as immunoglobulins, are made and secreted by B-lymphocytes in response to stimulation by antigens. Each specific antibody binds only to the specific antigen that stimulated its production.
SIMILAR TERMS--------------------------------------
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Infertility
The diminished or absent ability to conceive or produce an offspring while sterility is the complete inability to conceive or produce an offspring.
Influenza
An acute viral infection involving the respiratory tract. It is marked by inflammation of the nasal mucosa, the pharynx, and conjunctiva, and by headache and severe, often generalized, myalgia.
Insomnia
Disorders characterized by impairment of the ability to initiate or maintain sleep. This may occur as a primary disorder or in association with another medical or psychiatric condition.
Ia
"Immune response-associated" proteins, found on B cells and antigen-presenting cells of mice; an old term now replaced with MHC (major histocompatibility complex) class II molecules.
Idiotype
The combined antigenic determinants (idiotopes) found on antibodies of an individual that are directed at a particular antigen; such antigenic determinants are found only in the variable region.
Immediate-type hypersensitivity
Immune adherence
The adherence of particulate antigen coated with C3b to tissue having cells with C3b receptors.
Immune complex
Antigen bound to antibody.
Immune modulators
Substances that control the expression of the immune response.
Immune response (Ir) gene
A gene controlling an immune response to a particular antigen; most genes of this type are in the MHC (major histocompatibility complex), and the term is rarely used to describe other types of Ir genes outside the MHC.
Immunogen
A substance capable of inducing an immune response (as well as reacting with the products of an immune response). Compare with antigen.
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