Many of the symptoms of illness are products of the body’s attempts to fight off the problem. For example if someone gets a viral or bacterial infection they will develop a fever, an increase in body temperature which is uncomfortable and can even be life-threatening. This response though is evolved as it usually helps reduce the growth rate of the invaders and gives the body crucial time to develop a defensive response.
If the body is losing the fight it will at some point be unable to mount an effective defense. Failure of various systems of the body will mean that those responses that would serve to fight the illness no longer take place; someone who is still infected might stop having a fever but that doesn’t mean they are recovered.
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