For example, no matter how vigorously you dust or vacuum, you will not reduce the number of dust mites present deep within carpeting, pillows, and mattresses. Vigorous cleaning methods can put more dust into the air making symptoms worse. Tiny microscopic creatures called dust mites are an important cause of allergic reactions to house dust. They belong to the family of eight-legged creatures called arachnids. This family also includes spiders, chiggers and ticks.
Dust mites are hardy creatures that live well and multiply easily in warm, humid places.
They are rarely found in dry climates. As many as 10 percent of the general population and 90 percent of people with allergic asthma are sensitive to dust mites. Recent studies in the United States suggest that at least 45 percent of young people with asthma are allergic to dust mites. People who are allergic to dust mites react to proteins in the bodies and feces of the mites. These fecal particles are found in the highest concentrations in pillows, mattresses, carpeting, and upholstered furniture.