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Allergy-Proof Bedding Not Enough

But Dust Mite-Resistant Covers Can Still Help Allergy, Asthma
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WebMD Health News

July 16, 2003 -- Allergy-proof bedding is often recommended to help prevent the year-round misery suffered by people allergic to dust mites. But this bedding itself it doesn't do much to relieve asthma or allergy symptoms.

Bedding is a haven for dust mites, thousands of which can feed, breed, and live on a single gram of dust. Allergy-proof bedding -- covers for mattresses, pillows, and duvets -- are routinely recommended by allergists to prevent inhaling the dust that carries mite droppings, causing allergies and worsening asthma.

But it seems the allergy-proof bedding is not enough to prevent the symptoms associated dust mite allergies, according to two new studies in this week's edition of The New England Journal of Medicine.

Little Difference in Beddings

In the first study, British researchers gave 1,100 people with mild asthma either allergy-proof bedding resistant to dust mites or bedding not impermeable to allergens.

After one year, there was no difference in lung function testing or in use of asthma medication between the two groups.

In the second study, Dutch researchers say that allergy-proof bedding did reduce exposure to dust mites better than other coverings in 280 patients with known allergies, but not enough to prevent or reduce allergy symptoms.

The take-home message of both studies: Allergy-proof bedding, which costs between $20 and $60, isn't necessarily a waste of time and money. But it's not enough by itself to make a difference.

You cannot use covers by themselves to avoid allergy-triggers, which is routinely done by patients with dust mite allergies, Roy Gerth van Wijk, MD, PhD, researcher of the Dutch study, tells WebMD. "I still advise covers as a part of an allergy control program, provided that patients are motivated to take other measures."

In other words, if you are allergic to dust mites, continue to use the covers, but make sure you also address the other dust-filled places in your environment where mites infest.

"By themselves, dust mite-resistant covers may not do much. But they can still be, and probably should be, used in combination with other strategies to control allergy and asthma," says New York City allergist Clifford W. Bassett, MD, FAAAAI, spokesman for the American Academy of Allergy, Asthma and Immunology. "You also need to remove clutter -- especially in the bedroom -- avoid carpets and upholstered furniture, and continue medication recommended by your doctor."

Other measures he recommends include regularly dusting or washing baseboards, walls, and floors, changing and laundering bedsheets weekly, and cleaning furnace and air conditioning filters.

"These studies are certainly not the final word," Bassett tells WebMD. "In my experience, patients who use dust mite-proof protective coverings do find them to be helpful. They're not a financial hardship for most people, and an ounce of prevention is always worth a pound of cure."

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