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Raising your kids in a sterile lab environment is not keeping them healthy —

Getting the Dirt On Immunity: Scientists Show Evidence for Hygiene Hypothesis

This concept of exposing people to germs at an early age (i.e., childhood) to build immunity is known as the hygiene hypothesis. Medical professionals have suggested that the hygiene hypothesis explains the global increase of allergic and autoimmune diseases in urban settings. It has also been suggested that the hypothesis explains the changes that have occurred in society and environmental exposures, such as giving antibiotics early in life. However, neither biologic support nor a mechanistic basis for the hypothesis has been directly demonstrated. Until now.
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