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- WEHI.TV
Primary immunodeficiency

Our immune system normally prevents infection. In immunodeficiency, one or more components of the immune system are lacking. This puts people at risk of life-threatening infections.
Our research seeks to discover how immunodeficiencies occur, with the goals of improving diagnosis of immunodeficiencies and how they are treated.

Our immunodeficiency research
Our immunology researchers aim to understand how immunodeficiencies occur, and how they can be better treated. Our laboratory and clinical research efforts include:
- Defining how the immune system normally develops and functions, to understand what goes wrong in immunodeficiencies.
- Discovering the genetic and immune changes that cause common variable immunodeficiency, the most common inherited (primary) immunodeficiency in Australia and worldwide.
- Investigating HIV, a major cause of immunodeficiency worldwide.
What are immunodeficiencies?
Immunodeficiencies are a broad class of conditions where one or more components of the immune system are missing. A person with an immunodeficiency has trouble fighting infections. They may contract more illnesses than other people, and may become infected with microbes that do not normally cause disease in humans.
Primary and secondary immunodeficiency
When someone is born lacking a component of the immune system, it is termed ‘primary immunodeficiency’.
Secondary immunodeficiency describes immunodeficiencies arising as the result of another event such as HIV infection or taking immune suppressing medication.
The Immune Deficiencies Foundation Australia provides information and support for people with immunodeficiencies, their carers and relatives.
What causes primary immunodeficiency?
Many primary immunodeficiencies are caused by changes in the genes that contribute to immune cell development and function. This means they can be passed from parents to a child, or can occur frequently in an extended family.
What is common variable immunodeficiency?
Common variable immunodeficiency (CVID) is the most common primary immunodeficiency, both in Australia and worldwide. It is estimated that approximately one in 10,000 Australians have CVID.
People with CVID have problems making antibodies, which are important in fighting infections and building immune protection. Low levels of antibodies put people with CVID at risk of recurrent bacterial infections. These people are also unable to develop a normal immune response to vaccines.
Diagnosing CVID is difficult and requires exclusion of other primary immunodeficiencies. As symptoms of CVID can be quite different between people, many people with this condition are not diagnosed until they are adults.
What causes CVID?
CVID appears to be caused by faulty genes. However, it appears there are many different genes that can contribute to CVID. Only in a few cases have the gene changes causing CVID been identified. For most people, the underlying cause of CVID is not known.
Our research into CVID aims to find the underlying cause of CVID. To do this we need help from people with CVID, as well as people with another immune deficiency called X-linked agammaglobulinemia (XLA). Find out more about our study into the causes of CVID.
CVID and autoimmune disease
Around a quarter of people with CVID have autoimmune diseases. This suggests that the cause of CVID could be part of a broader problem with the control of the immune system, where appropriate immune responses to microbes are stifled, but harmful attacks on normal body tissues occur.
How is CVID treated?
Once diagnosed, the only treatment for CVID is to receive regular and lifelong treatment with antibodies (an important product of donated blood) from healthy donors. Even with this ‘antibody replacement therapy’ people with CVID frequently experience serious complications, including autoimmune disease. Antibody replacement therapy also cannot entirely prevent life-threating infections.
Researchers:
Super Content:
Catch up with this public talk discussing the latest research, discoveries and treatments for coeliac disease, lupus and primary immune deficiencies.
If you are aged between 18 and 80 and have been diagnosed with common variable immunodeficiency (CVID) or X-linked agammaglobulinemia (XLA), we invite you to contact our research team.
Frank Macfarlane Burnet was awarded the Nobel Prize in 1960 and is widely acknowledged as the founder of modern immunology. This animation was created to commemorate the 50th anniversary of Burnet's landmark discovery.
Our researchers have defined for the first time how the size of the immune response is controlled during infection, or in response to vaccination.