Arch Otolaryngol
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To estimate the occurrence of and associations between upper respiratory tract infections in preschool children, and to assess constitutional and environmental factors as determinants of these infections. ⋯ In preschool children, acute otitis media, tonsillopharyngitis, and common cold were quite common, while chronic rhinitis was less prevalent and strongly associated with atopic disease. Attendance at day care centers increased the risk of upper respiratory tract infections in this age group, although the effect was weaker than that in younger children.