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Nature Medicine 14, 797 (1 August 2008) | doi:10.1038/nm0808-797a

Allergy genes flew the coop, according to evolutionary analysis

Coco Ballantyne

An estimated 400 million people worldwide suffer from hay fever, and 300 million have the associated condition of asthma, according to the first-ever global allergy impact report published in June by the World Allergy Organization. Allergies have become increasingly common during the last few decades, and experts expect the trend to continue.