The house dust mite Dermatophagoides pteronyssinus is about half the size of a period on a newspaper. It has no sight, no respiratory system and is unable to drink, but lives by absorbing moisture and oxygen from the atmosphere.

Mite droppings, which contain digestive enzymes, are a major cause of allergy worldwide.

When people with a family history of allergy are repeatedly exposed to house dust mite droppings, they can develop a specific allergy to mites. Once allergy is diagnosed and allergic reactions become frequent, then allergic disease can develop. Continued exposure to the mite allergens can then become a trigger for chronic symptoms.

Source: www.housedustmite.org

What you can do to reduce dust mites?

• Use an impervious cover on your mattress.
• Avoid heavy drapes and carpeting; hard surfaces are best as they don't trap debris and allergens.
• Vacuum floors, drapes and upholstery regularly to reduce dust mite presence. Use a HEPA filter to avoid spread of salmonella and other bacteria through blowing air.
• Reduce dust mites by washing sheets once per week in hot water and bleach.
• Sanitize stuffed animals by vacuuming them weekly or putting them in a hot dryer can help control dust mites.