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The rising trends in asthma and associated allergic diseases create a problem that affects many developed and developing countries and that so far has defied explanation other than apportioning blame to changing lifestyles and the environment. But what aspects of the environment could be responsible for these changes? A number of hypotheses have been advanced the "hygiene hypothesis" finding popular favor but deprivation of the mucosal immune response from microbial programming early in life fits best with changing trends in atopy, rather than with trends in asthma. It is convenient and politically expedient to link asthma with air
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