Some statistics show that there can be up to two thousand mites in 1 gram of house dust. House dust mites to human body off the dander as food bait, dust mites grow in a variety of grains and flour, and to feed, so in the storage of grain, there are often a large number of worms grow. Udder dust mites are carnivorous dragons that feed on fungal spores in grain, house dust, and other organic matter. Demystifying dust mites mites in the taxonomy of arachnids belonging to the tiny arthropods, about more than 50,000 kinds of more than its shape like a spider with 8 legs, individual tiny, only 170-500 microns long, the human eye is not easy to find, usually with the help of magnifying glasses and microscopes in order to see. There are only a few types of mites that are related to human allergies, such as house dust mite, dust mite, and house dust mite. House dust mites breed mainly in pillows, bedding, upholstery and furniture in bedrooms. Dust mites also breed in large numbers on the floors of flour mills, cotton mills, food warehouses, and Chinese medicine warehouses. Dust mites are important allergens that induce bronchial asthma A large number of studies over the years have confirmed the close relationship between dust mites and bronchial asthma. Dust mite excretions, secretions and decomposition products of dead insects are allergens, and fecal pellets are the most allergenic. The above substances are decomposed into tiny particles, and through activities such as making beds and folding quilts, cleaning houses, etc., the dust is made to fly, and hypersensitive reactions are produced after inhalation by allergic individuals. Dust mite allergy is an exogenous allergic reaction, and patients often have a family history of allergy or a personal history of allergy. Clinical manifestations of dust mite allergy include allergic asthma, allergic rhinitis and atopic dermatitis. How to prevent? The main conditions affecting the survival of dust mites are temperature and humidity. The optimal temperature is 25±2℃ and the relative humidity is 75%-80%. In the north, spring and fall is the peak of dust mite reproduction, at this time the highest amount of mites indoors and in the food; the southern air is wet and humid, more conducive to the growth and reproduction of dust mites. Patients who are allergic to dust mites usually develop the disease throughout the year, but the symptoms are often aggravated during the peak season of dust mite reproduction. In the room to remove this allergen is the most direct and effective prevention and control methods, generally believe that the number of dust mites per square meter of the best indoor not more than 20. Dust mites are afraid of heat, the following heating method can be used to kill dust mites in mattresses, clothing and quilts: 24 hours exposure at 40℃; 8 hours exposure at 45℃; 2 hours exposure at 50℃; 10 minutes exposure at 60℃. It has also been reported that mites can be killed by exposure to -18°C for 24 hours. In short, can be exposed in hot and cold climates, clothing and vegetation or boiling water and other ways to remove mites. Most experts believe that frequent wiping of furniture, washing clothes, keep indoor dry and clean, reduce the accumulation of debris, as well as the use of plastic cloth sealed around the mattress pads, chair cushions, etc., can greatly limit the reproduction and growth of dust mites. Home storage of rice, area of other grains are very easy to mites, should be kept ventilated and dry, and do not store too much and placed too long. If you find a large number of mites growing in grain and flour, you should deal with them promptly.