The presence of carpets, age of dwelling, numbers of occupants, age of mattress, mechanical ventilation and dampness increase Der p 1 levels in houses in the Netherlands. In a cold temperature climate, the type ot buiiding, construction and ventilation affect the levels of dust mite allergens. Houses should be equipped with mechanical exhaust and supply ventilation to reduce indoor air humidity and reduce mite infestation. Air conditioning in homes across the U. S. A. significantly reduced mite allergen levels, and, typically, there was a tendency for Der f 1 to be higher than Der p 1.

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