Immunodeficiency – Causes, Symptoms & Treatment
Immunodeficiency refers to a weakening or absence of the immune system´s defenses, making affected individuals more susceptible to infections and illness.
Wissenswertes über "Immunodeficiency"
Immunodeficiency refers to a weakening or absence of the immune system´s defenses, making affected individuals more susceptible to infections and illness.
What is Immunodeficiency?
Immunodeficiency (also called immune deficiency or immune defect) occurs when the body´s immune system is unable to function properly. This means the body cannot effectively fight off pathogens such as bacteria, viruses, fungi, or parasites. As a result, affected individuals are more prone to frequent, severe, or unusual infections that would rarely affect people with a healthy immune system.
Immunodeficiency is broadly classified into two categories: primary immunodeficiency (congenital, present from birth) and secondary immunodeficiency (acquired during life). Both types can range in severity from mild susceptibility to life-threatening immune system failure.
Causes
Primary Immunodeficiency (Congenital)
Primary immunodeficiencies are caused by genetic mutations that impair the development or function of immune cells. Well-known forms include:
- Selective IgA deficiency: The most common congenital immunodeficiency, characterized by absence or very low levels of the antibody IgA.
- Severe Combined Immunodeficiency (SCID): A rare, life-threatening condition in which both T and B lymphocytes are absent or non-functional.
- Bruton agammaglobulinemia: An X-linked defect affecting mainly males, resulting in a complete absence of B cells.
- Common Variable Immunodeficiency (CVID): The most frequent symptomatic primary immunodeficiency in adults.
Secondary Immunodeficiency (Acquired)
Secondary immunodeficiencies develop over the course of a person´s life due to external factors or underlying diseases:
- HIV/AIDS: The human immunodeficiency virus specifically destroys CD4-positive T helper cells, significantly weakening immune defenses.
- Medications: Immunosuppressants (e.g., after organ transplantation), corticosteroids, and chemotherapy drugs can suppress immune function.
- Cancers: Particularly leukemia, lymphoma, and multiple myeloma can impair immune responses.
- Malnutrition: Deficiencies in key nutrients such as zinc, vitamin C, vitamin D, and protein weaken immune function.
- Chronic diseases: Conditions such as diabetes mellitus, chronic kidney disease, or liver cirrhosis can burden the immune system.
- Radiation therapy: Irradiation, especially of bone marrow regions, can impair blood cell production and immune defenses.
Symptoms
The symptoms of immunodeficiency vary widely depending on which part of the immune system is affected. Common signs include:
- Frequent, recurrent, or unusually severe infections (e.g., pneumonia, sinusitis, otitis media)
- Infections caused by rare or opportunistic pathogens (e.g., Pneumocystis jirovecii, cytomegalovirus)
- Poor response to standard antibiotics or prolonged recovery times
- Chronic diarrhea, weight loss, or failure to thrive (especially in children)
- Enlarged lymph nodes or spleen
- Autoimmune conditions or inflammatory diseases as accompanying features
Diagnosis
Diagnosing immunodeficiency involves several steps:
- Medical history and physical examination: Frequency and type of infections, family history, and current medications.
- Full blood count and differential: Assessment of the number and composition of white blood cells (leukocytes).
- Immunoglobulin levels: Measurement of antibody levels (IgG, IgA, IgM, IgE) in the blood.
- Lymphocyte subtyping: Flow cytometric analysis of T cells, B cells, and NK cells.
- Functional tests: Assessment of immune cell activity, such as lymphocyte proliferation assays.
- Genetic testing: When a primary immunodeficiency is suspected, genetic testing can identify specific mutations.
- HIV test: When acquired immunodeficiency is suspected.
Treatment
Primary Immunodeficiency
Treatment depends on the type and severity of the defect:
- Immunoglobulin replacement therapy: Regular administration of immunoglobulins (antibodies) intravenously or subcutaneously in cases of antibody deficiency.
- Stem cell transplantation: For severe forms such as SCID, allogeneic stem cell transplantation can be curative.
- Gene therapy: Gene therapy options are now available or under clinical investigation for certain primary immunodeficiencies.
- Prophylactic antibiotics or antifungals: To prevent infections in cases of persistent immune weakness.
Secondary Immunodeficiency
- Treatment of the underlying condition: For example, antiretroviral therapy (ART) for HIV/AIDS.
- Medication adjustment: Reducing immunosuppressive agents where clinically possible.
- Nutritional optimization: Correcting nutrient deficiencies that impair immune function.
- Vaccinations: Protective vaccines (especially inactivated vaccines) to prevent avoidable infections – live vaccines may be contraindicated and should be discussed with a physician.
References
- European Society for Immunodeficiencies (ESID): ESID Registry and Diagnostic Guidelines. https://esid.org (accessed 2024)
- Bonilla FA, Khan DA, Ballas ZK et al. - Practice parameter for the diagnosis and management of primary immunodeficiency. Journal of Allergy and Clinical Immunology. 2015;136(5):1186-1205.
- World Health Organization (WHO): Primary Immunodeficiency Diseases. Report of a WHO Scientific Group. Geneva, 2021.
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Related search terms: Immunodeficiency + Immune Deficiency + Immune Defect + Immunodeficiency Disorder