Immunodeficiency disease

Immunodeficiency diseases are a group of conditions caused by defective immune function resulting from incomplete development or damage to the immune system. Common immunodeficiency diseases primarily include: Congenital immunodeficiency diseases: Also known as primary immunodeficiency diseases, these are genetically linked and often occur in infants and young children. Acquired immunodeficiency diseases: Also known as secondary immunodeficiency diseases, these can occur at any age and are often caused by severe infections, especially those directly affecting the immune system, malignancies, use of immunosuppressants, radiation therapy, and chemotherapy. The most clinically representative example is AIDS (Acquired Immunodeficiency Syndrome).