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Purpose: Determining the culprit allergen is important for the diagnosis and management of allergic diseases. The skin prick test (SPT) has beenwidely used to identify culprit allergens. Skin reactivity to allergens has changed due to changes in lifestyle and outdoor environments. Therefore, theaim of the present paper was to examine changes in allergen sensitization in Korea. Methods: We enrolled 1,135 patients with respiratory allergicdiseases who were diagnosed at Severance Hospital from January 2010 to December 2011. SPTs were performed with inhalant allergens, and werecompared to our previous studies of the SPTs in the 1980s and the 1990s. Results: In the 2010s, the SPT positive rate of allergic rhinitis or allergicconjunctivitis was higher than asthma without allergic rhinitis or allergic conjunctivitis. The SPT positive rate was decreased by increments of age (Pvalue <0.01). Skin reactivity to tree pollens was significantly increased to 36.4% in the 2010s from 19.0% in the 1990s and 8.8% in the 1980s. Amongtree pollens, skin reactivity to oak (4.7%->14.4%), birch (7.1%->13.6%), alder (6.3%->13.4%) and pine (2.9%->14.3%) was significantly increasedin the 2010s compared with the 1990s, respectively. Current skin reactivity to grass pollens (13.9%) and weed pollens (27.0%) has significantly decreasedsince the 1990s (20.3%, 40.9%, respectively). Skin reactivity to house dust mites showed no difference between the 1990s (55.2%) and the2010s (55.6%). Skin reactivity to dog (27.3%->20.7%) and cockroach (25.3%->12.3%) have significantly decreased in the 2010s in comparison withthe 1990s. Conclusions: In light of the above results, we revealed the changes in skin reactivity to inhalant allergens that have occurred in Korean allergicpatients over the past three decades. Since outdoor environmental factors such as the amount of pollen, global warming and plant distributioncauses the changes in skin reactivity, further study and continuous close observation will be needed.

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