For most people, while they are disgusting, house dust mites are not actually harmful.
However, the medical significance of house dust mites arises because their microscopic cast skins and feaces are a major constituent of house dust that induces allergic reactions in some individuals.
There is a genetic predisposition to dust mite allergies, but like many allergies it can also develop over time. 18% to 30% of all people are allergic to dust mites' waste products, and almost 50% of hospitality rooms have allergen levels that are high enough to cause sensitivity in people who weren't previously allergic to dustmites.
In other words, high levels of dust mites and their wastes, can cause previously non-allergic people to develop an allergy. In addition to producing allergic reactions, dust mites can also cause nasal polyps growths within the nose |