Am 01.04.2012 13:19, schrieb Warp:

>    In human biology, extreme hygiene, especially on children, can actually
> be more harfmul than good in the long run: The immune system does not get
> exposed to the harmful microbes of the world, and thus doesn't build up
> resistance to them. If this continues for long, especially on young people,
> such a person can become very weak to diseases that normally people wouldn't
> even notice, or would only cause small symptoms.

... plus, there's evidence that an idle immune system will start busying 
itself with other stuff, such as developing allergies.

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