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Primary immunodeficiency. Primary immunodeficiencies are disorders in which part of the body's immune system is missing or does not function normally. [1] To be considered a primary immunodeficiency (PID), the immune deficiency must be inborn, not caused by secondary factors such as other disease, drug treatment, or environmental exposure to ...
Immunodeficiency, also known as immunocompromisation, is a state in which the immune system 's ability to fight infectious diseases and cancer is compromised or entirely absent. Most cases are acquired ("secondary") due to extrinsic factors that affect the patient's immune system. Examples of these extrinsic factors include HIV infection and ...
This is a list of primary immunodeficiencies (PID), which are immune deficiencies that are not secondary to another condition.. The International Union of Immunological Societies recognizes nine classes of primary immunodeficiencies, totaling approximately 430 conditions.
An immune disorder is a dysfunction of the immune system. [ 1] 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 ...
Hypogammaglobulinemia is an immune system disorder in which not enough gamma globulins are produced in the blood (thus hypo- + gamma + globulin + -emia ). This results in a lower antibody count, which impairs the immune system, increasing risk of infection. Hypogammaglobulinemia may result from a variety of primary genetic immune system defects ...
Humoral immune deficiencies are conditions which cause impairment of humoral immunity, which can lead to immunodeficiency. It can be mediated by insufficient number or function of B cells, the plasma cells they differentiate into, or the antibody secreted by the plasma cells. [7] The most common such immunodeficiency is inherited selective IgA ...
T cell deficiency is a deficiency of T cells, caused by decreased function of individual T cells, it causes an immunodeficiency of cell-mediated immunity. [1] T cells normal function is to help with the human body's immunity, they are one of the two primary types of lymphocytes (the other being B cells ). [medical citation needed]
Common variable immunodeficiency. Common variable immunodeficiency ( CVID) is an inborn immune disorder characterized by recurrent infections and low antibody levels, specifically in immunoglobulin (Ig) types IgG, IgM, and IgA. [ 2] Symptoms generally include high susceptibility to pathogens, chronic lung disease, as well as inflammation and ...