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An immune system is a system of biological structures and processes within an organism, which protects against disease by identifying and killing pathogens and tumor cells. It can detect a wide variety of agents, from viruses to parasitic worms, but must distinguish them from the body's own cells and healthy tissues in order to function properly. Detection is complicated because pathogens are adaptive and able to rapidly evolve to try to evade the immune system and thereby infect their host.