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The belief that children's immune systems need to be exposed to viruses and bacteria in order to strengthen them, but that children are overprotected from this exposure, is called the _____.

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meerkat18
This belief is called the hygiene hypothesis which is not completely valid and tested as truth and applicable to all cases. This states that once a child is exposed more to viruses and bacteria, the child becomes immune to sicknesses. Of course, this takes all the factors to play to determine the index of a child's immunity to illnesses.

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