Immunodeficiency with severe reduction in serum IgG and IgA with normal/elevated IgM and normal number of B-cells

Immunodeficiency with severe reduction in serum IgG and IgA with normal or elevated IgM and normal number of B-cells is a rare primary immunodeficiency disorder. In this condition, the immune system fails to properly switch from making one type of antibody (IgM) to making other important types (IgG and IgA). Normally, B-cells — the white blood cells that produce antibodies — go through a process called 'class switch recombination' to produce different antibody types needed to fight various infections. In this disease, B-cells are present in normal numbers but are unable to complete this switching process properly, resulting in very low levels of IgG and IgA while IgM remains normal or even higher than usual. This condition is sometimes grouped under the broader category of hyper-IgM syndromes, though it is a distinct entity. Patients typically experience frequent and severe infections, particularly of the respiratory tract (such as pneumonia, sinusitis, and ear infections), as well as gastrointestinal infections. Because IgG and IgA are critical for fighting bacteria and viruses throughout the body and at mucosal surfaces, affected individuals are vulnerable to a wide range of pathogens. Some patients may also develop enlarged lymph nodes, autoimmune problems, or chronic lung disease over time. Treatment primarily involves immunoglobulin replacement therapy (IVIG or subcutaneous immunoglobulin), which provides the missing IgG antibodies. Prophylactic antibiotics may also be used to prevent infections. Early diagnosis and consistent treatment can significantly improve quality of life and reduce the risk of long-term organ damage, particularly to the lungs.

Bring these to your next appointment

• Q1.What is the specific genetic cause of my condition, and should my family members be tested?,How often will I need immunoglobulin replacement therapy, and can I do it at home?,What infections should I be most concerned about, and how can I prevent them?,Are there any vaccines I should avoid or specifically receive?,Am I a candidate for bone marrow transplant, and what are the risks and benefits?,How will this condition affect my long-term lung health, and what monitoring is needed?,Are there any clinical trials or new treatments I should know about?

Common questions about Immunodeficiency with severe reduction in serum IgG and IgA with normal/elevated IgM and normal number of B-cells