This investigation aims to get to the bottom of a troublesome public health issue: The number of asthma sufferers in the U.S. has nearly doubled since 1980, making the debilitating disease "more prevalent and more damaging than ever before." Common culprits - cockroaches, dust mites, mold, pet hair, diesel fumes, smoke - no longer explain why asthma is the world's "affluent disease." Modern research suggests traditional Western means of fighting the disease - modern hygiene and antibiotics - have backfired.
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