Immunodeficiency - Definition

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Immunodeficiency is when the immune system is compromised. This condition causes a reduction or loss of the body's innate or acquired capacity to fight off attacks. When this happens, the body is incapable of producing an adequate number of antibodies to be able to match the antigens. There are two types of immunodeficiency: primary immunodeficiency, also called congenital immunodeficiency; and secondary, or acquired immunodeficiency, the most well-known example of which is AIDS.