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Disorders of the Immune System | Johns Hopkins Medicine
When your immune system doesn't work the way it should, it is called an immune system disorder.
https://www.hopkinsmedicine.org/health/conditions-and-diseases/disorders-of-the-immune-system
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Primary Immunodeficiency Symptoms & Causes | Boston Children's Hospital
Learn about Primary Immunodeficiency symptoms and causes from experts at Boston Children’s, ranked best Children’s Hospital by US News.
http://www.childrenshospital.org/conditions-and-treatments/conditions/p/primary-immunodeficiency/symptoms-and-causes
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Immunodeficiency disorders: MedlinePlus Medical Encyclopedia
Immunodeficiency disorders occur when the body's immune response is reduced or absent.
https://medlineplus.gov/ency/article/000818.htm
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Immune System and Disorders - Medline Plus
Your immune system is a complex network of cells, tissues, and organs that work together to defend against germs. It helps your body to recognize these "foreign" invaders. Then its job is to keep them out, or if it can't, to find and destroy them.
https://medlineplus.gov/immunesystemanddisorders.html
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University of Rochester Medical Center: Immune System Disorders
Your immune system is your body’s defense against infections and other harmful invaders. Without it, you would constantly get sick from germs such as bacteria or viruses.Your immune system is made up of special cells, tissues, and organs that work together to protect you.
https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentID=123
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immune system disorder | Definition, Causes, & Symptoms | Britannica
Immune system disorder, any of various failures in the body’s defense mechanisms against infectious organisms. Immune system disorders include immune deficiency diseases, such as AIDS, as well as allergies and autoimmune disorders. Learn more about the types, causes, and symptoms of immune system disorders.
https://www.britannica.com/science/immune-system-disorder
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What are Immune Deficiency Disorders?
Most of the time, the immune system protects the body from germs and other threats. But sometimes it gets off track and has a weaker response to these threats. This low activity is called immune deficiency and it makes you less able to fight off infections.
https://www.webmd.com/a-to-z-guides/immune-deficiency-disorders
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The Many Causes Of Immune Deficiency -- ScienceDaily
Defects of the immune system lead to increased susceptibility to infection, autoimmune diseases (e.g. inflammatory rheumatism), allergies and sometimes even cancer. An intact immune system, on the other hand, ensures physical health and well-being.
https://www.sciencedaily.com/releases/2009/09/090914111540.htm
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Primary immunodeficiency - Symptoms and causes - Mayo Clinic
Frequent infections could mean you have an immune-system disorder. The conditions in this category are usually caused by genetic changes.
https://www.mayoclinic.org/diseases-conditions/primary-immunodeficiency/symptoms-causes/syc-20376905
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Immunodeficiency Disorders: Types, Symptoms, and Diagnosis
Immunodeficiency disorders prevent your body from fighting infections and diseases. This means it’s easier for you to catch viruses and bacterial infections. You can be born with one or develop one later in life. Here’s what you need to know about immunodeficiency disorders, including types, causes, and symptoms.
https://www.healthline.com/health/immunodeficiency-disorders