Oxford University Press, Clinical Infectious Diseases, 3(57), p. 392-397, 2013
DOI: 10.1093/cid/cit289
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Respiratory tract infections (RTIs) are very common worldwide. We prospectively demonstrate an association between low serum 25-hydroxyvitamin D level and increased risk of laboratory-confirmed viral upper RTI in children. Future studies should evaluate the role of supplementation to reduce RTIs.