According to a European study in the latest "New England Journal of Medicine," children who live on farms have a much lower risk of developing asthma than suburban and urban dwellers because the rural children are exposed to a greater diversity of germs, helping to fortify their immune systems. The researchers collected samples of dust from houses in Germany, Austria and Switzerland, analyzed the microbes in the samples and linked the data to the incidence of asthma in each family.
The scientists stressed that it was the variety of bugs that made the difference, not the sheer number.
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