Abstract
The spatial distribution and abundance of house dust mites, Dermatophagoides spp., in human dwellings was investigated in southern Calif. Significantly higher levels of mites occurred on the depressed area near the welt cording of mattresses as compared to remaining surface of mattresses. Higher mite levels occurred on mattress pads than other bedding items, while the next highest levels occurred on most bedspreads as compared to other bedding items. Head portion of mattresses and floors at sides of mattresses bore higher or significantly higher infestations than foot portions of these areas. The floor area from periphery of beds up to 61 cm around them yielded 89% of mites collected from floor areas. The majority of unencased mattresses yielded higher or significantly higher infestations than other habitats sampled in houses. Curtains, window ledges, and filters of forced-air furnaces also yielded mites, verifying that these mites can become airborne.
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