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Amish girls

In recent decades, the prevalence of asthma and allergies has increased between two- and threefold in the United States. These days, one in 12 kids has asthma. More are allergic.

The uptick is often said to have started in the late 20th century. But the first hint of a population-wide affliction — the sneezing masses — came earlier, in the late 19th century, among the American and British upper classes. Hay fever so closely hewed to class lines, in fact, it was seen as a mark of civilization and refinement. Observers noted that farmers — the people who most often came in contact with pollens and animal dander — were the ones least likely to sneeze and wheeze.

This phenomenon was rediscovered in the 1990s in Switzerland. Children who grew up on small farms were […]

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