MITE ASTHMA AND RESIDENCY - A CASE-CONTROL STUDY ON THE IMPACT OF EXPOSURE TO HOUSE-DUST MITES IN DWELLINGS

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Abstract
The occurrence of mites in house dust from the homes of 25 patients with newly diagnosed house dust mite asthma was much greater than that in the house dust from homes of 75 randomly selected matched control subjects. The difference in exposure corresponded to a relative risk of about 7.0, and a clear dose-response relationship could be demonstrated. The 25 patients lived in older and more humid houses than the control subjects did, which explains the greater number of house dust mites found and suggests possibilities for and the necessity of introducing hygienic standards for the indoor environment as a measure of primary prevention in house dust mite allergy.