Pathogens can have both beneficial and dangerous effects: H.Pylori causes peptic ulcers and gastric cancer and has also been implicated in Alzheimer's and Parkionson's disease - : About 50% of the world's population are infected with H.Pylori - (but not all develop ulcers): The authors relate the effects on asthma to the hygiene hypothesis: Bugs and dirt in small doses at an early age correctly affect the immune system and this is good - but if the immune system has not been correctly primed, infections at a later age can be dangerous.
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