Growing Up On a Farm Directly Affects Regulation of the Immune System, Study Finds
http://www.sciencedaily.com/releases/2012/02/120208132549.htm
"Dr Marie Lewis, Research Associate in Infection and Immunity at the School of Veterinary Sciences, who led the research, said: "Many large-scale epidemiological studies have suggested that growing up on a farm is linked to a reduced likelihood of developing allergic disease. However, until now, it has not been possible to demonstrate direct cause and effect: does the farm environment actively protect against allergies, or are allergy-prone families unlikely to live on farms?"
http://www.sciencedaily.com/releases/2012/02/120208132549.htm
"Dr Marie Lewis, Research Associate in Infection and Immunity at the School of Veterinary Sciences, who led the research, said: "Many large-scale epidemiological studies have suggested that growing up on a farm is linked to a reduced likelihood of developing allergic disease. However, until now, it has not been possible to demonstrate direct cause and effect: does the farm environment actively protect against allergies, or are allergy-prone families unlikely to live on farms?"
In the study, piglets were nursed by their mothers on a farm while their siblings spent their early life (from one day onwards) in an isolator unit under very hygienic conditions and were fed formula milk, therefore, reflecting the extremes of environment human babies are raised in."