Protein substances in Dust Mite feces produces antibodies in humans who are allergic when these are inhaled or touch the skin. These antibodies cause the release of histamines which cause nasal congestion, swelling and irritation of the upper respiratory passages. Typical Symtoms - Hayfever, Watering eyes, Runny nose, Itching, Asthma, Difficulty in breathing, Infantile eczema. Etc. The following may contribute to worsening symptoms Poor ventilation, High Humidity, High Temparatures above 70 F / 20 C, Tobacco smoke etc.
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