Mites in mattress stuffing are an important source of indoor allergens. in 1967, researchers in Europe found that house dust mites (Dermatophagoides pteronyssinus) were an important allergen in mattress dust. House dust mites feed on shed human epithelium. Secondly, house dust mites are also found in excessively fluffy furniture, carpets and pillows. Mites have the highest concentration of allergens in their feces, but some studies have shown that a variety of other particles can also carry mite allergens. Therefore, preventive measures include not only the elimination of mites, but also the physical transfer of mites, or the creation of barriers between mite allergens and suspected allergic individuals. Studies have shown that effective mite eradication is of significant clinical value. Because dust particles carrying mite allergens are larger than those carrying cat allergens, they settle more rapidly, so patients generally exhibit mild allergic symptoms only after longer exposures to mite allergens. Short-term exposure to high levels of mite allergens can occur when vacuuming or cleaning carpets, beds, and upholstery. Therefore, some patients who are normally asymptomatic may experience acute wheezing or generalized wind masses, or even shock, when making bedding or suddenly entering a certain environment.