|Classification and external resources|
An immune disorder is a dysfunction of the immune system. These disorders can be characterized in several different ways:
- By the component(s) of the immune system affected
- By whether the immune system is overactive or underactive
- By whether the condition is congenital or acquired
According to the International Union of Immunological Societies, more than 150 primary immunodeficiency diseases (PIDs) have been characterized. However, the number of acquired immunodeficiencies exceeds the number of PIDs.
It has been suggested that most people have at least one primary immunodeficiency. Due to redundancies in the immune system, though, many of these are never detected.
List of some autoimmune disorders
- Certain types of hemolytic anemia
- Type one diabetes
- Graves disease
- Rheumatoid arthritis
- Multiple sclerosis (although it is thought to be an immune-mediated process)
- Goodpasture's syndrome
- Pernicious anemia
- Some types of myopathy
Primary immune deficiency diseases are those caused by inherited genetic mutations. Secondary or acquired immune deficiencies are caused by something outside the body such as a virus or immune suppressing drugs.
Primary immune diseases are at risk to an increased susceptibility to, and often recurrent ear infections, pneumonia, bronchitis, sinusitis or skin infections. Immunodeficient patients may less frequently develop abscesses of their internal organs, autoimmune or rheumatologic and gastrointestinal problems.
- Primary immune deficiencies
- Severe combined immunodeficiency (SCID)
- DiGeorge syndrome
- Hyperimmunoglobulin E syndrome (also known as Job’s Syndrome)
- Common variable immunodeficiency (CVID): B-cell levels are normal in circulation but with decreased production of IgG throughout the years, so it is the only primary immune disorder that presents onset in the late teens years.
- Chronic granulomatous disease (CGD): a deficiency in NADPH oxidase enzyme, which causes failure to generate oxygen radicals. Classical recurrent infection from catalase positive bacteria and fungi.
- Wiskott-Aldrich syndrome (WAS)
- Autoimmune lymphoproliferative syndrome (ALPS)
- Hyper IgM syndrome: X-linked disorder that causes a deficiency in the production of CD40 ligand on activated T-cells. This increases the production and release of IgM into circulation. The B-cell and T-cell numbers are within normal limits. Increased susceptibility to extracellular bacteria and opportunistic infections.
- Leukocyte adhesion deficiency (LAD)
- NF-κB Essential Modifier (NEMO) Mutations
- Selective immunoglobulin A deficiency: the most common defect of the humoral immunity, characterized by a deficiency of IgA. Produces repeating sino-pulmonary and gastrointestinal infections.
- X-linked agammaglobulinemia (XLA; also known as Bruton type agammaglobulinemia): characterized by a deficiency in tyrosine kinase enzyme that blocks B-cell maturation in the bone marrow. No B-cells are produced to circulation and thus, there are no immunoglobulin classes, although there tends to be a normal cell-mediated immunity.
- X-linked lymphoproliferative disease (XLP)
- Secondary immune deficiencies
An allergy is an abnormal immune reaction to a harmless antigen.
- Seasonal allergy
- Perennial allergy
- Food allergy
- Allergic rhinitis
- Atopic dermatitis
- Geha RS, Notarangelo LD, Casanova JL, et al. (October 2007). "Primary immunodeficiency diseases: an update from the International Union of Immunological Societies Primary Immunodeficiency Diseases Classification Committee". J. Allergy Clin. Immunol. 120 (4): 776–94. doi:10.1016/j.jaci.2007.08.053. PMC 2601718. PMID 17952897.
- Kumar A, Teuber SS, Gershwin ME (2006). "Current perspectives on primary immunodeficiency diseases". Clin. Dev. Immunol. 13 (2–4): 223–59. doi:10.1080/17402520600800705. PMC 2270780. PMID 17162365.
- Casanova JL, Abel L (August 2007). "Primary immunodeficiencies: a field in its infancy". Science 317 (5838): 617–9. doi:10.1126/science.1142963. PMID 17673650.
- "Primary Immune Deficiency Diseases". Department of Health and Human Services: National Institutes of Health. Retrieved 31 August 2011.
- "Primary Immunodeficiency FAQ". INFO4PI. Retrieved 31 August 2011.