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The bacterial composition of ventilation filter dust in Norwegian pre-school nurseries

Nygaard, Anders Benteson; Charnock, Colin
Journal article, Peer reviewed
Accepted version
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URI
https://hdl.handle.net/10642/5274
Date
2017
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  • TKD - Institutt for bygg- og energiteknikk [386]
Original version
Nygaard A, Charnock C. The bacterial composition of ventilation filter dust in Norwegian pre-school nurseries. Indoor + Built Environment. 2017   http://doi.org/10.1177/1420326X17713831
Abstract
The microbial content of dust collected from intake and exhaust air filters in six Norwegian nurseries was

determined using 16S rRNA pyrosequencing and plate count analyses. The concentration of endotoxins

was also estimated. About 96% of the sequences were classified as Actinobacteria, Proteobacteria,

Firmicutes, Bacteroidetes and Cyanobacteria. At the genus level, about 30% of sequences from the

exhaust filter were classified as bacteria of probable human origin, such as Streptococcus and

Corynebacterium species. These were close to absent in intake dust samples (<1%). This suggests

that occupancy shapes the indoor microbiota, creating an environment relatively rich in genera of

potential health significance. There were significantly greater counts of culturable bacteria and fungi

in exhaust samples, indicating that passage of air through the nursery causes deterioration in the general

air quality. Although there was more endotoxin in exhaust dust, the endotoxin levels per colony

forming unit were similar in both samples. This study explores, for the first time, the bacterial composition

of ventilation filter dust in Norwegian nurseries, and is important as it reveals what types of microorganisms

nursery users are exposed to. In addition to possible direct health issues, the nature of our

early exposure to microbes may be significant in the development of immunological conditions.
Publisher
Sage
Journal
Indoor + Built Environment

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