Laboratory of Integrated Pest Management, FCG Research Institute, Inc.
Dyson Limited.
Biocontrol Sci. 2020;25(4):193-202. doi: 10.4265/bio.25.193.
This study examined the fungal flora contained in the dust of bedding used in 50 houses in Japan. The result showed that the mycoflora having the largest isolation rate was yeasts, which were isolated by 42 out of 50 houses (84%), and exceeded the isolation rate of Cladosporium spp. (80%) and Aspergillus spp. (66%). In addition, the isolation rate of Alternaria, which was an important fungus causing asthma, 66% was being considered as a high isolation rate, and this result was very interesting. The isolation rate of xerophilic fungi such as Aspergillus restrictus and Wallemia often found in house dust on the floor, was not very high. Forty-one strains of yeasts isolated from each dust sample were identified, and Naganishia diffluens species complex and Filobasidium magnum had a larger number of 13 strains, respectively. Since N. diffluens was the yeasts often isolated from human skin, it was thought to be an association between the fungal skin flora and fungal flora of bed dust. Meanwhile, there was no report of isolation of F. magnum from house dust previously. To the best of our knowledge, this is the first study showing its isolation from bedding with relatively high frequency.
本研究调查了日本 50 户人家使用的床上用品灰尘中含有的真菌菌群。结果表明，分离率最高的真菌菌群是酵母菌，有 42 户（84%）分离出酵母菌，超过了枝孢菌（80%）和曲霉菌（66%）的分离率。此外，作为引起哮喘的重要真菌的链格孢菌的分离率为 66%，被认为是一个较高的分离率，这一结果非常有趣。在地板上房屋灰尘中常见的干性真菌，如局限曲霉和瓦勒迈青霉的分离率并不是很高。从每个灰尘样本中分离出 41 株酵母菌进行鉴定，其中 Naganishia diffluens 种复合体和 Filobasidium magnum 分别有 13 株。由于 N. diffluens 是经常从人类皮肤中分离出来的酵母菌，因此认为它与皮肤真菌菌群和床上用品灰尘中的真菌菌群有关。同时，此前没有从房屋灰尘中分离出 F. magnum 的报道。据我们所知，这是首次显示其从床上用品中以相对较高的频率分离出来的研究。
