Allergy to Dust
Dust mites in the house are arthropods segmented invisible to the eye by their microscopic size (about 0.3 mm) that live in dust in most homes, but their number rises significantly when the temperature is moderate (20 – 30 ÂșC) and humidity is very high (relative humidity between 70% -80%).
These tiny mites depend basically to feed on dead skin cells sloughed human in the natural desquamation process (hence one of the most common mites are Dermatophagoides scientific name: D. farinae and D. pteronyssinus, something like “skin-eating”).Cause of infection
Dust mites in the house are the most frequent cause of sensitization and asthma in much of the world and, of course, the primary source of antigens in house dust.
The main heat-labile antigen is a glycoprotein (the PRSC 1 is the most important) that is found in the feces of the mites (it is estimated that each mite produces 20 stools a day), which, with minimum diameters of 10-40 mm, are readily respirable by humans.
However, air levels of Derp 1 antigen of the mites are very low compared with the high reaching this antigen concentrations in mattresses and bedding (pillows, sheets and comforters).
Also found high concentrations may be on the sofas, carpets, curtains and stuffed toys.