| http://www.w3.org/ns/prov#value | - Lack of contact with microorganisms in dirt when growing up is hypothesised to be the cause of the epidemic of allergies such as asthma.[4] The human immune system requires activation and exercise in order to function properly and exposure to dirt may achieve this.[5] For example, the presence of staphylococcus bacteria on the surface of the skin regulates the inflammation which results from injur
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