Dust mite allergens, perhaps the most common cause of perennial allergic rhinitis, usually produce symptoms similar to pollen allergy and can also trigger asthma.
Mites are a member of the arachnid family that includes spiders, chiggers, and ticks.
There are two species belonging to the genus Dermatophagoides commonly found in North America. Both species feed on human skin, pollen, fungi, bacteria, and animal dander. Dust mites and their droppings are known allergens. People develop an allergic response to protein in the mite's feces. A gram of house dust may contain 100 to 500 mites and each mite produces 10 to 20 waste particles a day.