Our picture of allergy is changing. For one thing there is a dramatic rise in prevalence. Eczema, hay fever, asthma, and potentially life-threatening allergies to certain foods, drugs or other substances, have become alarmingly common: the World Allergy Organization White Book on Allergy 2011–2012 estimates that about 30–40% of the world’s population is affected by one or more allergic conditions.
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