<I>Distribution of house dust mites in two high-rise residential buildings in central Japan</I>

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  • AOKI T
    Department of Architecture, Nagoya Institute of Technology
  • MIZUTANI A
    Department of Architecture, Nagoya Institute of Technology
  • SUTO C
    Department of Medical Zoology, Nagoya University School of Medicine

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  • 高層集合住宅における階層の室内塵性ダニ類の分布に及ぼす影響
  • コウソウ シュウゴウ ジュウタク ニ オケル カイソウ ノ シツナイ ジンセイ ダニルイ ノ ブンプ ニ オヨボス エイキョウ

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To examine the influence of floor levels on the distribution of house dust mites in two high-rise residential buildings (a 7-story building in Nagoya, A; and an 11-story building in Toyota; B), mite survey was conducted from June to October 1996. In Building A, indoor climate was measured in one of rooms on each floor from December 30, 1996 to January 4, 1997, when all the residents were absent. The mite faunas found in the two buildings were much similar to each other; Dermatophagoides consisted of about 80 % of the mites detected and D. farinae predominated D. pteronyssinus at a ratio of approximately 5: 1. It was a sharp contrast to the ratio of 1: 1 found in our previous survey carried out in 1983-1984. D. farinae distributed almost eqaully regardless of the floor levels. On the contrary, the numbers of D. pteronyssinus, non-Pyroglyphidae and eggs of Pyroglyphidae had a tendency to decrease with the floor levels. The indoor temperature was lowered by wind, but not so greatly affected by rain, nor by the floor levels. Whereas, relative humidity in the rooms on high-floor was lower and affected more intensely with the change of outdoor weather; raised by rain and lowered by wind, than in the low floor rooms. These results suggested that indoor humidity decreased with the floor levels and became unfavorable for the growth and development of mites having high humidity requirements such as D. pteronyssinus. Having relatively low humidity requirements, D. farinae could stand the decrease of humidity in the high floors. Thus, the difference in the distribution of D. farinae and D. pteronyssinus by floor level in the high-rise buildings was considered to be mainly due to an interaction between the humidity conditions in rooms affected by the floor levels and the ecological characteristics of mites, especially humidity requirements.

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