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Not all farming environments protect against the development of asthma and wheeze in children

Ege, Markus Johannes and Frei, Remo and Bieli, Christian and Schram-Bijkerk, Dieneke and Waser, Marco and Benz, Marcus R. and Weiss, Gertraud and Nyberg, Fredrik and van Hage, Marianne and Pershagen, Göran and Brunekreef, Bert and Riedler, Josef and Lauener, Roger and Braun-Fahrländer, Charlotte and von Mutius, Erika and Parsifal Study team, . (2007) Not all farming environments protect against the development of asthma and wheeze in children. Journal of allergy and clinical immunology, Vol. 119, H. 5. S. 1140-1147.

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Official URL: http://edoc.unibas.ch/dok/A6124414

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Abstract

BACKGROUND: In recent years, studies have shown a protective effect of being raised in a farm environment on the development of hay fever and atopic sensitization. Inconsistent data on the relation of farming to asthma and wheeze have raised some doubt about a true protective effect. OBJECTIVE: We sought to study the differential effects of farm-associated exposures on specific asthma-related health outcomes. METHODS: The cross-sectional Prevention of Allergy Risk Factors for Sensitization in Children Related to Farming and Anthroposophic Lifestyle study included 8263 school-age children from rural areas in 5 European countries. Information on farm-related exposures and health outcomes was obtained by using questionnaires. In subsamples allergen-specific IgE and RNA expression of CD14 and Toll-like receptor genes were measured, and dust from children's mattresses was evaluated for microbial components. RESULTS: Inverse relations with a diagnosis of asthma were found for pig keeping (odds ratio [OR], 0.57; 95% CI, 0.38-0.86), farm milk consumption (OR, 0.77; 95% CI, 0.60-0.99), frequent stay in animal sheds (OR, 0.71; 95% CI, 0.54-0.95), child's involvement in haying (OR, 0.56; 95% CI, 0.38-0.81), and use of silage (OR, 0.55; 95% CI, 0.31-0.98; for nonatopic asthma) and in Germany for agriculture (OR, 0.34; 95% CI, 0.22-0.53). Protective factors were related with higher expression levels of genes of the innate immunity. Potential risk factors for asthma and wheeze were also identified in the farm milieu. Levels of endotoxin and extracellular polysaccharides were related to the health outcomes independently of the farm exposures. CONCLUSIONS: The protective effect of being raised in a farm environment was ascribed to distinct exposures. CLINICAL IMPLICATIONS: The development of atopic sensitization and atopic and nonatopic asthma is most likely determined by different environmental factors, possibly reflecting distinct pathomechanisms.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Former Units within Swiss TPH > Microbial Exposure & Childhood Allergies (Braun-Fahrländer)
UniBasel Contributors:Waser, Marco
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:Mosby
ISSN:0091-6749
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:23
Deposited On:24 May 2013 09:19

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