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You'll Never Guess What's Sleeping in Your Bed

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May 22, 2001 (San Francisco) -- Invisible, breath-robbing, spiderlike creatures are nesting in the bedding of some 23 million American homes, many of them low-income homes, according to new research released here at an annual meeting of lung specialists.

Known as dust mites, these multilegged creatures look like miniature spiders and have been linked to asthma attacks and allergies.

Even though you can't see them, dust mites exist year-round in virtually every type of housing. They live off human skin flakes, which are constantly sloughed off. And they rapidly reproduce in moist environments.

Many studies already have established the connection between mites and asthma and allergy attacks, but Darryl Zeldin, MD, of the National Institute of Environmental Health Sciences, conducted the first nationwide survey looking for evidence of the pesky critters lurking between the sheets. He presented his results at the International Conference of the American Thoracic Society.

Zeldin and colleagues sampled bedding in 831 homes where about 2,500 people lived from 75 different locations around the country. In addition to vacuuming up dust samples, the researchers collected environmental data and information about the study participants' race, income level, and health status.

It turns out that some 86% of American homes have detectable levels of dust mite allergen, but more importantly, around 23% of homes have enough of the irritant to trigger respiratory problems. Since mites are drawn to humidity, Zeldin says you're four times as likely to have mites in the Northeast as in the West where it's drier.

In addition, low-income families' homes have a higher level of dust mites than previously thought. "Homes where the annual income is less than $30,000 per year are about twofold more likely to have dust mite allergens in their beds, and about sevenfold more likely to have cockroach allergen in their beds," says Zeldin.

The researchers found cockroach allergen in about 6% of American homes. They also have been linked to asthma.

"In environmental science, we're very interested in environmental justice, the lower socioeconomic class families are disproportionately affected," says Zeldin.

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