The 'hygiene hypothesis' suggests that asthma is the result of minimal childhood exposure to chemicals that cause asthma attacks. According to this hypothesis, exposure to allergens in childhood increases the immune systems tolerance of these relatively harmless molecules. The hygiene hypothesis predicts that the lowest levels of asthma should occur in people living in

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The 'hygiene hypothesis' suggests that asthma is the result of minimal childhood exposure to chemicals that cause asthma attacks. According to this hypothesis, exposure to allergens in childhood increases the immune systems tolerance of these relatively harmless molecules. The hygiene hypothesis predicts that the lowest levels of asthma should occur in people living in