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Mattress covers may not help with dust mite allergies

NEW YORK (Reuters Health) - Based on two dozen clinical trials, U.S. researchers find that expensive mattress covers make no difference in reducing dust mite allergies or their symptoms. Up to 40 percent of the world population has allergies, and dust mites are thought to be one of the most common causes. Doctors often tell patients to buy special mattress and pillow covers despite a lack of evidence they relieve the problem, the authors say.

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