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What disorder results from a hypersensitivity of the immune system?

A Allergy

The immune system plays an important role in the human body, protecting it against harmful bacteria, viruses and other foreign threats. Sometimes, however, the immune system develops a hypersensitivity, which means that it overreacts to stimuli that would otherwise be harmless. One example of hypersensitivity is an allergy; neither asthma nor cancer can be traced to a hypersensitive immune system. Fever is an epiphenomenon that may accompany many clinical situations and has no particular connection to a hypersensitive immune system.