Immunodeficiency diseases

Primary immunodeficiency is genetic and present from birth, caused by inherited or new gene mutations. Secondary immunodeficiency develops later in life from external factors like HIV, medications, malnutrition, or chronic illness. Primary types are usually diagnosed in childhood, while secondary types can occur at any age. Treatment approaches differ based on the underlying cause.

Most primary immunodeficiency diseases cannot be fully cured, but many can be managed effectively with treatment. Immunoglobulin replacement therapy helps restore antibody levels in some conditions. Stem cell transplants can cure certain severe types by rebuilding the immune system. Secondary immunodeficiencies may improve if the underlying cause is treated, such as controlling HIV or stopping immune-suppressing medications.

Primary immunodeficiency diseases affect about 1 in 1,200 people worldwide. Some types are very rare, while others like selective IgA deficiency affect up to 1 in 300 people. Secondary immunodeficiencies are more common because they can result from many different causes. HIV infection, medications, and aging contribute to millions of cases globally.

Blood tests for immunodeficiency include immunoglobulin levels like IgG, IgA, IgM, and IgE. Low IgG may indicate common variable immunodeficiency or selective IgG subclass deficiency. Complete blood counts check white blood cell numbers and types. Antibody response tests measure how well your immune system reacts to vaccines or infections. Your doctor may order additional specialized tests based on your symptoms.

Lifestyle changes support immune health but cannot cure genetic immunodeficiency diseases. Eating a nutrient-rich diet, getting adequate sleep, and managing stress help your immune system work as well as possible. Avoiding smoking and limiting alcohol reduce additional immune suppression. Good hygiene and avoiding sick contacts lower your infection risk. These habits work best alongside medical treatment prescribed by your doctor.

No, immunodeficiency diseases themselves are not contagious. You cannot catch a primary immunodeficiency from someone else because it's genetic. However, people with immunodeficiency are more susceptible to infections, which can be contagious. If you have an immunodeficiency, you should avoid close contact with people who are sick to protect yourself from catching infections.

See a doctor if you get more than 4 ear infections or 2 sinus infections per year. Also seek care if you have pneumonia more than once yearly or infections that don't respond to standard antibiotics. Chronic diarrhea, frequent yeast infections, or slow wound healing warrant evaluation. Children who fail to gain weight or meet developmental milestones should be assessed for possible immune problems.

Secondary immunodeficiency can develop suddenly if triggered by infection, medication, or illness. Primary immunodeficiencies are genetic but mild cases may not be diagnosed until adulthood. Some people compensate well until a severe infection reveals the underlying problem. Common variable immunodeficiency often appears in the 20s or 30s, even though it's present from birth.

Immunoglobulin replacement therapy provides antibodies that your body cannot make on its own. The treatment involves infusions of IgG collected from healthy blood donors. You receive it through an IV at a clinic or hospital every 3 to 4 weeks. Some people use subcutaneous infusions at home weekly. This therapy helps prevent infections in people with antibody deficiencies like common variable immunodeficiency.

Chronic stress and poor nutrition can weaken your immune system but don't cause true immunodeficiency diseases. They may increase infection risk and slow recovery from illness. However, they don't create the genetic mutations or permanent damage seen in immunodeficiency disorders. Improving diet and managing stress supports immune health but won't fix an underlying immunodeficiency that requires medical treatment.