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WHY does your body temperature rise when you have a virus like flu? - Richard Smith, Hackney, East London

WHEN your temperature rises due to an infection, it is called a fever. Fevers are caused by chemicals called pyrogens flowing in the bloodstream. Pyrogens make their way to the hypothalamus in the brain, which is in charge of regulating temperature. When pyrogens attach to certain receptors in the hypothalamus, body temperature rises.

One purpose of a fever is thought to be to raise body temperature enough to kill off bacteria and viruses sensitive to temperature changes.
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Title Annotation:Letters
Publication:Sunday Mirror (London, England)
Date:Sep 20, 2009
Words:95
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