The prevalence of allergic diseases shows a well-documented increase in developed countries over several decades. Currently, 20-25% of European adults are affected. Westernisation, urbanisation, and affluence contribute to allergy development, so allergy is expected to increase in developing countries in the future. Identifying primary causes, developing new therapies, and increasing treatment access may interrupt the allergic epidemic.
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Allan Linneberg (2011) studied this question.
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