Research Article

Different Development Forms of Local Allergic Rhinitis towards Birch

Figure 4

Changes in allergen bronchial provocation tests in the active and placebo groups. In the active group, a significant decrease in bronchial reactivity to birch allergen concentration after allergen immunotherapy was observed (). No similar trends in the placebo group were noticed. In one patient, conversion to the positive bronchial reaction was confirmed after three years of observation.
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