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Your immune system is your body’s first line of defense against infections. But for people with primary immunodeficiency, this defense is weakened from birth, making even minor illnesses harder to fight. Primary immunodeficiency diseases (PIDD) are a group of over 400 rare, chronic disorders that disrupt the immune system’s ability to function properly. Without early diagnosis and management, these conditions can lead to frequent, severe, or life-threatening infections.
If you or a loved one seems to get sick more often than others or struggles to recover from infections, it may be a sign of an underlying primary immunodeficiency. This guide breaks down what you need to know: from types and symptoms to diagnosis and treatment options, including how specialists at Apex Allergy & Asthma in San Antonio can help.
Think You or a Loved One Has an Immune Deficiency?
Primary immunodeficiency is a group of
genetic disorders in which part of the immune system is missing or doesn’t function as it should. Unlike secondary immunodeficiency, which is caused by external factors like infections, medications, or chronic diseases, primary immunodeficiency is present from birth, though symptoms may not appear until later in life.
These disorders can affect any part of the immune system, including:
Without a fully functional immune system, the body struggles to fend off bacteria, viruses, fungi, and other pathogens, leading to recurrent or persistent infections.
Primary immunodeficiencies are typically grouped by which part of the immune system is affected. Here are some of the most common
types of primary immunodeficiency:
| Type | Description | Examples |
|---|---|---|
| Antibody Deficiencies | Low or absent antibody levels make it hard to fight bacterial infections. | Common Variable Immunodeficiency (CVID), X-linked Agammaglobulinemia (XLA) |
| Cellular Deficiencies | Issues with T cells, leading to severe viral, fungal, and parasitic infections. | DiGeorge Syndrome, Severe Combined Immunodeficiency (SCID) |
| Combined Immunodeficiencies | Affects both B and T cells, leading to severe, recurrent infections. | SCID, Wiskott-Aldrich Syndrome |
| Phagocyte Deficiencies | Neutrophils or other phagocytes don’t work properly, increasing the risk of bacterial/fungal infections. | Chronic Granulomatous Disease (CGD), Leukocyte Adhesion Deficiency (LAD) |
| Complement Deficiencies | Missing or non-functional complement proteins, leading to recurrent infections or autoimmune issues. | C1 Inhibitor Deficiency, C2 Deficiency, C3 Deficiency, C5-C9 Deficiencies |
| Innate Immune Deficiencies | Problems with the body’s first line of defense (e.g., skin, mucosal barriers). | Toll-like Receptor Deficiencies |
Primary immunodeficiency is almost always
caused by genetic mutations. These mutations can be:
In some cases, the genetic cause is unknown. However, researchers continue to identify new genes linked to these disorders, improving diagnosis and treatment options.
The signs of primary immunodeficiency can vary widely depending on the type and severity of the disorder. However, some
warning signs of primary immunodeficiency are red flags that warrant further evaluation:
Note: Symptoms often appear in infancy or early childhood, but some primary immunodeficiency diseases may not be diagnosed until adulthood.
Here are some examples of primary immunodeficiency and their key features:
Early diagnosis of primary immunodeficiency is critical to prevent complications. The diagnostic process typically includes:
Your doctor will ask about your history of infections, family history, and any other symptoms.
A thorough exam to check for signs like enlarged lymph nodes, spleen, or skin abnormalities.
Newborn Screening: In the United States, SCID screening has been adopted by all states and is included in routine newborn screening programs.
While there’s no cure for most primary immunodeficiency diseases, treatments can help manage symptoms, prevent infections, and improve quality of life. Primary immunodeficiency treatment options include:
If you or your child experiences signs of primary immunodeficiency, such as frequent, severe, or unusual infections, it’s important to seek evaluation from a specialist. Apex Allergy & Asthma in San Antonio offers expert diagnosis and management for primary immunodeficiency diseases, including:
Don’t wait for infections to become life-threatening. Early intervention can make a significant difference in long-term health outcomes.
Primary immunodeficiency can be a challenging and often overlooked condition, but with the right knowledge and support, it’s manageable. Recognizing the signs, understanding the types, and seeking early treatment for primary immunodeficiency can help you or your loved one lead a healthier, more active life. If you suspect an immune deficiency, don’t hesitate to reach out to a specialist. The team at Apex Allergy & Asthma in San Antonio is here to provide expert care and guidance tailored to your needs.
Take Control of Your Immune Health
Selective IgA Deficiency is the most common primary immunodeficiency disease, affecting about 1 in 500 people. However, many individuals with this condition have no symptoms and may never be diagnosed.
Primary immunodeficiency is genetic and present from birth, while secondary immunodeficiency is acquired later in life due to factors like infections (e.g., HIV), medications (e.g., chemotherapy), or chronic diseases (e.g., diabetes).
Many primary immunodeficiency diseases are inherited, but some can also result from spontaneous genetic mutations. If you have a family history of PIDD, your risk may be higher.
Avoid exposure to sick individuals, live vaccines (unless approved by your doctor), raw or undercooked foods, and crowded or unsanitary environments. Always follow your doctor’s recommendations for preventing infections.
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Mark C Stahl, DO
Mark C Stahl, DO