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How the human body reacts to viruses and bacteria: the purpose of a fever

"Viruses and bacteria are always in our environment to some extent. Being healthy doesn’t guarantee that you will never get sick. If you are healthy, your resistance will probably be good so that you don’t fall sick too often but when you do, your immune system is able to spring into action to defend you and to overcome the invading bugs."
"Once your white blood cells detect that a virus or bacteria is present in your body, their number increases and they rush to the area of infection. In the process, they release chemical messengers called phagocytes.
The phagocytes release pyrogenic chemicals which cause the Hypothalamus to release Prostaglandins. These Prostaglandins then act on another part of the Hypothalamus, telling it to turn up the body’s thermostat, in order to produce a fever."

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