Bruton's agammaglobulinemia; X-linked agammaglobulinemia; Immunosuppression - agammaglobulinemia; Immunodepressed - agammaglobulinemia; Immunosuppressed - agammaglobulinemia
Definition
Agammaglobulinemia is an inherited disorder in which a person has very low levels of protective immune system proteins called immunoglobulins. Immunoglobulins are a type of antibody. Low levels of these antibodies make you more likely to get infections.
Causes
This is a rare disorder that mainly affects males. It is caused by a gene defect that blocks the growth of normal, mature immune cells called B lymphocytes.
As a result, the body makes very little (if any) immunoglobulins. Immunoglobulins play a major role in the immune response, which protects against illness and infection.
People with this disorder develop infections again and again. Common infections include ones that are due to bacteria such as Haemophilus influenzae, pneumococci (Streptococcus pneumoniae), and staphylococci. Common sites of infection include:
- Gastrointestinal tract
- Joints
- Lungs
- Skin
- Upper respiratory tract
Agammaglobulinemia is inherited, which means other people in your family may have the condition.
Symptoms
Symptoms include frequent episodes of:
Infections typically appear in the first 4 years of life.
Other symptoms include:
- Bronchiectasis (a disease in which the bronchial tubes in the lungs become damaged and enlarged)
- Asthma without a known cause
Exams and Tests
The disorder is confirmed by blood tests that measure levels of immunoglobulins.
Tests include:
Treatment
Treatment involves taking steps to reduce the number and severity of infections. Antibiotics are often needed to treat bacterial infections.
Immunoglobulins are given through a vein or by injection to boost the immune system.
A bone marrow transplant may be considered.
Support Groups
More information and support for people with agammaglobulinemia and their families can be found at:
Outlook (Prognosis)
Treatment with immunoglobulins has greatly improved the health of those who have this disorder.
Without treatment, most severe infections are deadly.
Possible Complications
Health problems that may result include:
When to Contact a Medical Professional
Contact your health care provider for an appointment if:
- You or your child has experienced frequent infections.
- You have a family history of agammaglobulinemia or another immunodeficiency disorder and you are planning to have children. Ask the provider about genetic counseling.
Prevention
Genetic counseling should be offered to prospective parents with a family history of agammaglobulinemia or other immunodeficiency disorders.
References
Cunningham-Rundles C. Primary immunodeficiency diseases. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 231.
Hernandez-Trujillo VP, Ortega C. B-cell and antibody deficiencies. In: Kliegman RM, St. Geme JW, Blum NJ, et al, eds. Nelson Textbook of Pediatrics. 22nd ed. Philadelphia, PA: Elsevier; 2025:chap 166.
Pai SY, Notarangelo LD. Congenital disorders of lymphocyte function. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 52.
Antibodies
