In this April 9, 2013 photo, an Amish girl chases a cow from the outfield during a baseball game in Bergholz, Ohio. A study published Wednesday, August 3, 2015 explored reasons why asthma is so uncommon among Amish communities, where children play barefoot in dairy barns and farm fields, while indoor pets are taboo. Early and frequent exposure to farming microbes might boost Amish children’s disease-fighting immune system, the study suggests. (Photo by Scott R. Galvin/AP Photo)
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