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        Part of QUEST
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        Asthma: What Brought on the Epidemic? | QUEST

        The rates of childhood asthma in the United States rose 160 percent from 1980 to 1994 and have remained high ever since, making this chronic lung illness the country's third most common pediatric disease. In this video from QUEST produced by KQED, the "hygiene hypothesis" is examined in relation to asthma causes.

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