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PubMed This is a summary of 20 peer-reviewed journal articles Updated
Clinical Immunology · Common Variable Immunodeficiency

What is Common Variable Immunodeficiency (CVID) disease?

At a Glance

Common variable immunodeficiency (CVID) is a lifelong condition in which the body makes too few effective antibodies, causing recurrent infections and sometimes digestive or inflammatory complications. Blood tests and vaccine responses help confirm the diagnosis, and treatment usually includes immunoglobulin replacement.

Common Variable Immunodeficiency (CVID) is a lifelong immune-system condition that makes the body vulnerable to recurrent infections. A new diagnosis and a history of repeated illness can be stressful, but CVID is manageable. It is not contagious, it is not the result of a personal failure, and it can usually be treated effectively with ongoing medical care and monitoring.

The B-Cell Defect

In a healthy immune system, specialized white blood cells called B cells mature and produce proteins called immunoglobulins (antibodies) to fight off pathogens (bacteria and viruses). In people with CVID, B cell numbers are often normal, but these cells have trouble maturing and fail to produce enough effective antibodies [1]. Specifically, the body produces very low levels of Immunoglobulin G (IgG), and often low levels of Immunoglobulin A (IgA) and Immunoglobulin M (IgM) [2].

Because antibody levels are low, the immune system struggles to mount an effective defense [1]. This means that people with CVID may catch infections more easily, have a harder time clearing them, and may have reduced or variable responses to routine vaccines [1]. However, because vaccine responses are reduced rather than entirely absent, vaccination decisions remain important and should be discussed with a doctor.

Typical Symptoms

The most common clinical sign of CVID is a history of frequent, unusually severe, or long-lasting respiratory infections [3]. This often includes recurrent sinus infections, ear infections, bronchitis, and pneumonia [4].

Beyond the respiratory tract, CVID can also affect the gastrointestinal (GI) tract. Some people experience chronic diarrhea and malabsorption (difficulty absorbing nutrients from food) due to infections or inflammation in the small bowel [5] [6]. Note: Not everyone with CVID will have all of these symptoms.

Other Complications

While infections are the hallmark of CVID, non-infectious complications can also occur. Some individuals may develop autoimmune conditions (where the immune system mistakenly attacks the body’s own tissues), enlarged lymph nodes, an enlarged spleen, or granulomatous (inflammatory) disease [7] [8]. Repeated lung infections or inflammation can sometimes lead to bronchiectasis, which is permanent widening and scarring of the airways [8]. Because these complications vary greatly from person to person, routine monitoring is an important part of long-term care [9].

How is CVID Diagnosed?

Diagnosing CVID is a careful process, often managed by a clinical immunologist. It generally requires [1] [2] [10] [11]:

  1. Persistently low levels of IgG, often combined with low IgA and/or IgM.
  2. Impaired specific antibody responses. This is often measured using “vaccine challenge tests,” which are simple blood tests to see if the body produces antibodies after receiving a specific vaccine.
  3. Ruling out secondary causes of low antibodies. The doctor will ensure the low levels are not caused by medications (especially those targeting B cells), protein loss through the kidneys or gut, hematological (blood) conditions, or viral infections like HIV.

What Causes CVID?

CVID is genetically heterogeneous, meaning its causes are highly varied [12]. Some people have an inherited genetic susceptibility, but in many patients, no specific gene alteration can be identified [13]. Researchers believe that polygenic factors (small variations across multiple genes) and epigenetic factors (environmental influences on how genes are turned on or off) play a role, but the exact mechanisms remain incompletely defined [14] [12].

Age of Onset

CVID can become apparent at almost any age. While it is frequently recognized in late adolescence or adulthood, symptoms can begin in early childhood, and it is sometimes not diagnosed until a person is in their 50s or older [15] [16]. Because its symptoms overlap with ordinary illnesses, diagnosis is frequently delayed [17].

What Happens Next (Treatment)

CVID care is individualized. The primary treatment is immunoglobulin replacement therapy (IgRT), which provides the body with the antibodies it is missing to help prevent infections [18]. IgRT can be given intravenously (through a vein, IVIG) or subcutaneously (under the skin, SCIG) [19] [20]. A specialist will also coordinate infection prevention, monitor lung and GI health, and determine which vaccines are recommended or should be avoided (such as live vaccines).

Common questions in this guide

What is CVID, and how does it affect the immune system?
Common variable immunodeficiency is a lifelong condition in which the body makes too few effective antibodies. The number of B cells may be normal, but they do not mature or work properly, making it harder to prevent and clear infections.
What symptoms can common variable immunodeficiency cause?
CVID most often causes repeated, unusually severe, or long-lasting respiratory infections, including sinus infections, ear infections, bronchitis, and pneumonia. Some people also have chronic diarrhea, difficulty absorbing nutrients, autoimmune conditions, enlarged lymph nodes or spleen, or inflammatory lung disease.
How is CVID diagnosed?
Doctors usually look for persistently low IgG antibody levels, often with low IgA or IgM, along with a weak antibody response after vaccination. They also rule out other causes of low antibody levels, such as certain medicines, protein loss, blood conditions, and some infections.
What causes common variable immunodeficiency?
CVID has many possible causes, and no single cause is found in every person. Some people have an inherited genetic susceptibility, while researchers also suspect that combinations of gene variations and environmental effects on gene activity may contribute.
How is CVID treated?
The main treatment is immunoglobulin replacement therapy, which supplies antibodies the body is missing and helps prevent infections. It may be given through a vein as IVIG or under the skin as SCIG, with individualized monitoring and infection-prevention care.
Can CVID start in childhood or adulthood?
CVID can become apparent at almost any age, including early childhood, adolescence, or adulthood. It is often recognized later because its symptoms can resemble ordinary infections, so diagnosis may be delayed.

Related questions

What Do TREC and KREC Tests Screen For in Newborns? What Is the Difference Between GOF and LOF Mutations? Why Is Primary Immunodeficiency Now Called IEI? Explained What Is Life Expectancy With Primary Immunodeficiency? Why Are Live Vaccines Unsafe With Primary Immunodeficiency?
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Primary vs Secondary Immunodeficiency: Key Differences What Are the Warning Signs of Primary Immunodeficiency? Can Primary Immunodeficiency Be Permanently Cured? Can Primary Immunodeficiency Be Diagnosed in Adults? How to Manage Primary Immunodeficiency Anxiety and Stress? Why Use Prophylactic Antibiotics in Primary Immunodeficiency? Why Do Primary Immunodeficiencies Cause Autoimmune Disease? What Are Long-Term Complications of Primary Immunodeficiency How Do IVIG and SCIG Differ for Primary Immunodeficiency? What Is Genetic Testing's Role in Primary Immunodeficiency? What lifestyle changes help manage primary immunodeficiency? Why Does SCID Require Immediate Treatment for Babies?

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References

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This page is for informational purposes only and does not constitute medical advice. A clinical immunologist can interpret your results and guide your CVID care.