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'Hygiene Hypothesis' or 'Old Friends' Theory?

Dr. Jeffrey McCombs | Posted 01.27.2013 | Healthy Living
Dr. Jeffrey McCombs

Is it the "hygiene hypothesis" or the "old friends" theory that makes the most sense? From a recent report on papers from the International Scientific Forum on Home Hygiene, it seems like it's just two views from different sides of the same coin.