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Indoor dust and air concentrations of endotoxin in urban and rural environments.

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Barnig, C Reboux, G Roussel, S Casset, A Sohy, Carine [UCL] de Blay, F

Rural dairy farming is associated with high exposure to indoor endotoxins as compared to rural nonfarming houses and urban houses. The time spent on the mattress (7 h for an adult) and of the proximity of the contaminated source should be taken into account with the other causes of exposure. Studies in European children from a farming background have shown that these children have a reduced risk of asthma and atopic sensitization compared to their urban counterparts. It has been suggested that this might be due to exposure to high levels of endotoxin in the farming environment. The aim of this study was to compare indoor endotoxin concentrations in air and dust samples from randomly selected urban and rural dwellings. In the rural area, endotoxins were analysed in farmhouses and nonfarmhouses as well as housing characteristics, lifestyle factors and agricultural practices likely to influence air and dust endotoxin levels. Endotoxin levels were significantly higher in floor (6600 ± 6100 vs 3600 ± 5600 and 3800 ± 17,000 ng g⁻¹; P < 0·001) and mattress dust (2900 ± 4100 vs 1100 ± 2400 and 800 ± 2600 ng g⁻¹; P < 0·001) from farmhouses compared to other rural and urban homes. However, no difference was observed between endotoxin concentrations in the air of urban and rural houses, and airborne endotoxin levels did not correlate to dust levels. Lack of ventilation and direct entry into the house were correlated with an increase in dust endotoxin levels. These results confirm that dairy farming is associated with high exposure to endotoxins in indoor dust samples. No difference was observed between indoor airborne concentrations between urban and rural houses. These results suggest that measuring endotoxin in dust is the most relevant method to assess endotoxin exposure.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2013
Language Anglais
Journal information "Letters in Applied Microbiology" - Vol. 56, no.3, p. 161-167 (2013)
Peer reviewed yes
Publisher Wiley-Blackwell Publishing Ltd. ((United Kingdom) Chichester)
issn 0266-8254
e-issn 1472-765X
Publication status Publié
Affiliations UCL - (MGD) Service de pneumologie
UCL - SSS/IREC/LUNS - Pôle pneumologie, ORL (airways) et dermatologie (skin)
MESH Subject Adolescent ; Female ; Floors and Floorcoverings ; Housing ; Humans ; Hypersensitivity, Immediate ; Rural Population ; Urban Population ; Ventilation ; Adult ; Agriculture ; Air ; Air Pollution, Indoor ; Beds ; Child ; Dust ; Endotoxins
Links
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Bibliographic reference Barnig, C ; Reboux, G ; Roussel, S ; Casset, A ; Sohy, Carine ; et. al. Indoor dust and air concentrations of endotoxin in urban and rural environments.. In: Letters in Applied Microbiology, Vol. 56, no.3, p. 161-167 (2013)
Permanent URL http://hdl.handle.net/2078.1/133935