The highest rates of allergy and asthma are found in the English-speaking developed countries: Australia, Ireland, New Zealand, the UK, and the US. Today, about one in ten children in the US has asthma, a disease that kills three thousand people in the country every year, and as many as 40 percent are affected by allergies. Combined, allergic disease, including asthma, is the third-most-common chronic condition among children under eighteen years old in the US. Meanwhile, asthma and allergy remain very rare conditions in many developing countries. The changes have happened too fast to have
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