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Idiopathic:
of unknown causation.
Ig:
immunoglobulin of any of the five classes (IgA, IgD, IgE, IgG or IgM).
Immediate Hypersensitivity:
hypersensitivity (allergic reaction) that develops without delay.
Immune:
characterized by the capacity to distinguish foreign material from self and to react via the immune response following antigenic challenge (exposure).
Immunity:
the capacity to distinguish foreign material from self, and to react via the immune response.
Immunization:
the process of creating immunity in an individual.
Immunoglobulin:
a protein of animal origin endowed with specific antibody activity. Immunoglobulins are found in serum and other body fluids and tissues (saliva, urine, spinal fluid, and lymph nodes). There are five classes of immunoglobulin (IgA, IgD, IgE, IgG, and IgM). IgE is involved in allergy.
Intolerance:
inability to absorb or metabolize nutrients (e.g. lactose intolerance).
Intradermal:
within skin.
Intramuscular:
within muscle (as in an intramuscular injection).
Intravascular:
within a blood vessel.
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