Abstract
Four sites in homes of dust-allergic patients were sampled for house dust mites. Levels of infestation in specific sites ranged from 0–3120 mites per gram of dust for Dermatophagoides spp., with considerable variation within and between homes. Greater usage of infested articles and rooms and larger household size were correlated with higher mite densities. A positive correlation was found between mite population levels in mattresses and living room furniture as compared to floors beneath them. Plastic encasement precludes mite occurrence in mattresses, but not in other locations. Use of an air filtering device did not reduce the mite population to a low level. No correlation was found between mite density and age of dwelling, dwelling type, socioeconomic level of the resident, or presence or absence of central air conditioning, and dehumidifiers.
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