The main finding of our study was the increased percentage of GM-CSF+ monocytes in atopic subjects compared with healthy controls. In allergic patients, natural seasonal pollen exposure resulted in increased numbers of GM-CSF+ cells among both monocytes and CD4+ T cells. We have also shown that a seasonal change in Th2/Th1 cytokine ratio requires an adequate and prolonged allergen stimulation that is seen late in the pollen season.
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