Prenatal exposure to a farm environment modifies atopic sensitization at birth

Ege, M. J. and Herzum, I. and Büchele, G. and Krauss-Etschmann, S. and Lauener, R. P. and Roponen, M. and Hyvärinen, A. and Vuitton, D. A. and Riedler, J. and Brunekreef, B. and Dalphin, J. C. and Braun-Fahrländer, C. and Pekkanen, J. and Renz, H. and von Mutius, E. and Protection, Against Allergy Study in Rural Environments Study group. (2008) Prenatal exposure to a farm environment modifies atopic sensitization at birth. Journal of allergy and clinical immunology, Vol. 122. pp. 407-412.

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Official URL: http://edoc.unibas.ch/dok/A6005526

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BACKGROUND: Previous cross-sectional surveys have suggested that maternal exposure to animal sheds during pregnancy exerted a protective effect on atopic sensitization in children lasting until school age. OBJECTIVE: We sought to evaluate the effects of maternal exposure to animal sheds and other farm-related exposures during pregnancy on cord blood IgE levels in a prospective birth cohort. METHODS: Pregnant women living in rural areas in Austria, Finland, France, Germany, and Switzerland were recruited in the third trimester of pregnancy. Information on maternal farm-related exposures, nutrition, and health during pregnancy was obtained by means of interviews. Specific IgE levels for food and common inhalant allergens were assessed in cord blood of 922 children and peripheral blood samples of their mothers. RESULTS: Different sensitization patterns in cord blood of farm and nonfarm children were observed. In multivariable analysis consumption of boiled, but not unboiled, farm milk during pregnancy was positively associated with specific IgE to cow's milk independently from maternal IgE. In contrast, there was an inverse relationship between maternal exposure to animal sheds and cord blood IgE levels against seasonal allergens (adjusted odds ratio, 0.38; 95% CI, 0.21-0.70). This association was not confounded by maternal IgE levels. Maternal contact with hay enhanced the protective effect of exposure to animal sheds on IgE levels to grass pollen in cord blood. CONCLUSIONS: Maternal exposure during pregnancy influences atopic sensitization patterns in cord blood. The (microbial) context of allergen contact possibly modifies the risk of atopic sensitization.
Faculties and Departments:03 Faculty of Medicine > Departement Public Health > Sozial- und Präventivmedizin
UniBasel Contributors:Braun-Fahrländer, Charlotte
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2012 16:22
Deposited On:08 Nov 2012 16:12

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