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Conclusions: Helicobacter pylori colonization seems to protect against allergic disorders in comparison with the effect of respiratory tract infections. The hygiene hypothesis may be better explained when this kind of gastrointestinal and respiratory tract infections are subtly differentiated.doi:10.1097/01.wox.0000412102.79708.c6 fatcat:7wpghaqzwnbcxf6w4ycjaowmfm