The immune system protects the body against external harmful invaders, such as viruses, bacteria, fungi, and so on. The immune system consists of various physical barriers (e.g. membranes), the white blood cells (leukocytes; T-cells and B-cells), and so on. Immune response symptoms include inflammation and infection symptoms. Symptoms of excessive immune response include allergic reaction, hives (urticarial), asthma attack, anaphylaxis, and so on. Immune system disorders include allergies, asthma, hypersensitivity syndromes, autoimmune diseases, and immune deficiency disorders.
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