What is cvid

Last updated: April 1, 2026

Quick Answer: CVID (Common Variable Immunodeficiency) is a rare genetic immune disorder characterized by low antibody production and recurrent infections. It affects approximately 1 in 25,000 people and requires lifelong immunoglobulin therapy.

Key Facts

Overview

Common Variable Immunodeficiency (CVID) is a primary immunodeficiency disorder affecting the adaptive immune system's ability to produce adequate antibodies. Unlike X-linked agammaglobulinemia, CVID affects both males and females and has a more variable presentation, making diagnosis challenging.

Causes and Pathophysiology

CVID results from genetic mutations affecting B cell maturation and differentiation. While specific genes have been identified in some cases, the genetic basis remains unknown in most patients. The condition leads to significantly reduced levels of immunoglobulins (antibodies), particularly IgG, IgA, and IgM.

Clinical Symptoms

Patients experience recurrent infections including sinusitis, otitis media, bronchitis, and pneumonia. Some individuals also develop autoimmune conditions, granulomatous diseases, or malignancies. Symptoms vary widely in severity and onset.

Diagnosis

Diagnosis involves measuring serum immunoglobulin levels (typically IgG below 300 mg/dL) and assessing vaccine response. B cell numbers are usually normal or only mildly reduced, distinguishing CVID from other immunodeficiencies. Testing typically occurs when recurrent infections become concerning.

Treatment and Management

The primary treatment is immunoglobulin replacement therapy, either intravenous (IVIG) or subcutaneous (SCIg). Prophylactic antibiotics may be prescribed, and patients should avoid live vaccines. Regular monitoring for complications is essential.

Related Questions

How is CVID different from other immunodeficiency disorders?

CVID affects both sexes and has variable presentation, unlike X-linked disorders. It's characterized by low antibodies but normal B cell numbers, distinguishing it from X-linked agammaglobulinemia where B cells are absent.

Can CVID be cured?

CVID cannot currently be cured, but symptoms are managed through lifelong immunoglobulin replacement therapy and prophylactic antibiotics. Bone marrow transplantation is experimental and rarely performed.

What is the life expectancy for someone with CVID?

With proper immunoglobulin therapy and management, many CVID patients have normal or near-normal lifespans. Life expectancy depends on disease severity and response to treatment.

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Sources

  1. NIH Rare Diseases - Common Variable Immunodeficiency Public Domain
  2. Wikipedia - Common Variable Immunodeficiency CC-BY-SA-4.0