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Immunoglobulin Deficiency: Causes, Symptoms & Treatment

Immunoglobulin deficiency is a condition in which the body produces insufficient antibodies, weakening the immune system and increasing susceptibility to infections.

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Things worth knowing about "Immunoglobulin Deficiency"

Immunoglobulin deficiency is a condition in which the body produces insufficient antibodies, weakening the immune system and increasing susceptibility to infections.

What Is Immunoglobulin Deficiency?

Immunoglobulin deficiency, also known as antibody deficiency, is an immune system disorder in which the body does not produce enough immunoglobulins – the proteins that act as antibodies. These antibodies are essential for recognizing and neutralizing pathogens such as bacteria, viruses, and fungi. When immunoglobulin levels are too low, the immune system is weakened, leaving the body vulnerable to frequent and severe infections.

Immunoglobulin deficiency may be congenital (primary) or acquired during a person´s lifetime (secondary). It is one of the most common forms of primary immunodeficiency.

Causes

Primary Immunoglobulin Deficiency

Primary immunoglobulin deficiency results from a genetic defect affecting antibody production. Common forms include:

Selective IgA deficiency: The most prevalent form, characterized by absent or markedly reduced immunoglobulin A levels.
Common Variable Immunodeficiency (CVID): A frequent disorder involving low levels of multiple immunoglobulin classes.
X-linked agammaglobulinemia (Bruton disease): A severe congenital defect resulting in near-absent B cells and antibodies, primarily affecting males.
Transient hypogammaglobulinemia of infancy: A physiological, usually self-resolving antibody deficiency in early childhood.

Secondary Immunoglobulin Deficiency

Secondary deficiency develops as a consequence of other diseases or treatments, including:

Hematological malignancies (e.g., multiple myeloma, chronic lymphocytic leukemia)
Long-term use of corticosteroids or immunosuppressive drugs
Chemotherapy or radiation therapy
Protein loss due to nephrotic syndrome or severe gastrointestinal disorders
HIV infection

Symptoms

Symptoms vary depending on the severity and the class of immunoglobulin affected. Common signs include:

Frequent and recurrent respiratory tract infections (sinusitis, bronchitis, pneumonia)
Unusually prolonged or severe course of infectious illnesses
Infections caused by opportunistic pathogens rarely seen in healthy individuals
Chronic diarrhea or gastrointestinal problems
Autoimmune conditions (particularly in CVID)
Poor or absent response to vaccinations

Diagnosis

Diagnosis is established through blood tests measuring the levels of immunoglobulin classes (IgG, IgA, IgM, and IgE). Further diagnostic steps may include:

Measurement of specific antibody responses following vaccination
Flow cytometry to assess B cell populations
Genetic testing when a primary immunodeficiency is suspected
Exclusion of secondary causes (e.g., full blood count, kidney and liver function tests)

Treatment

Immunoglobulin Replacement Therapy

The primary treatment for clinically significant antibody deficiency is immunoglobulin replacement therapy. Patients receive regular infusions of immunoglobulin preparations derived from the plasma of healthy donors. This can be administered intravenously (IVIG) or subcutaneously (SCIG).

Antibiotic Prophylaxis and Infection Management

Preventive antibiotic therapy may be used to reduce the frequency of infections. Active infections are treated promptly with targeted antibiotic or antifungal agents as appropriate.

Treatment of the Underlying Condition

In secondary immunoglobulin deficiency, managing the underlying disease is essential – for example, treating the underlying malignancy or adjusting immunosuppressive medication.

Stem Cell Transplantation

For severe congenital forms (e.g., severe combined immunodeficiency), hematopoietic stem cell transplantation may be considered as a potentially curative treatment option.

References

European Society for Immunodeficiencies (ESID): ESID Registry and Clinical Guidelines for Primary Immunodeficiency Diseases. esid.org (2023).
Bonilla FA et al. - Practice parameter for the diagnosis and management of primary immunodeficiency. Journal of Allergy and Clinical Immunology, 136(5):1186-1205 (2015). PubMed PMID: 26371839.
World Health Organization (WHO): Primary Immune Deficiency Diseases. WHO Technical Report Series (2020).

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