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There are few published studies on prevalence of allergic rhinitis in preschool children. The aims of this study were to verify the prevalence, clinical characteristics, and treatment of allergic rhinitis ( AR) symptoms in the first year of life adding supplementary questions to the EISL instrument. A cross-sectional study used Phase III EISL written questionnaire in addition to modified allergic rhinitis ISAAC questions. One thousand and three parents of infants answered the questionnaire: 484 (48.3%) had at least one sneezing, or a runny or blocked nose episodes without cold or flu in the first year of life. A quarter of infants had recurrent wheezing (≥3 episodes) and more frequent in the presence of AR symptoms. Physician diagnosis of AR and the use of intranasal steroids and both antihistamines and intranasal steroids were more common among those infants with AR symptoms. The prevalence of AR symptoms was high and starting early in life. [ABSTRACT FROM AUTHOR]