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Immunology is the study of the body’s natural defense mechanisms against disease and the responses of the body when challenged by antigens. Antigens include toxins or poisonous substances, bacteria, viruses, pollen, and foreign blood cells, and the presence of antigens in the body triggers an immune response, usually the production of antibodies.
Inflammation and inflammatory diseases can be classified in a number of different ways, for example as allergies or autoimmune disease, but in all cases the common factor is that inflammation results from the inappropriate activation of the cells of the immune system.