title: Serum vitamin D concentrations and associated severity of acute lower respiratory tract infections in Japanese hospitalized children.
abstract: BACKGROUND
  Vitamin D is an immunomodulatory molecule related to innate immunity that may contribute to the increased occurrence of acute lower respiratory infection (ALRI) in children, one of the most common reasons for hospitalization and intensive care unit admission. In the present study, the association between vitamin D deficiency and the severity of respiratory infection was evaluated by determining serum concentrations of 25-hydroxyvitamin D (25(OH)D) in a group of hospitalized children with ALRI.
  
  
  METHODS
  Of the 28 children admitted to Nihon University Nerima-Hikarigaoka Hospital with ALRI over the period November 2008–May 2009, 26 were diagnosed as having bronchiolitis and two were found to have pneumonia. A competitive protein binding radioimmunoassay was used to determine serum 25(OH)D concentrations.
  
  
  RESULTS
  Mean 25(OH)D concentrations in breast-fed children with ALRI (n = 7) were significantly lower than those in children with ALRI who were bottle fed/weaned (n = 6) or on a regular diet (n = 15; 14.6 ± 9.7, 28.9 ± 6.9 and 24.6 ± 8.8 ng/mL, respectively). There was a significant correlation between vitamin D deficiency (<15 ng/mL) and the need for supplementary oxygen and ventilator management.
  
  
  CONCLUSIONS
  Significantly more children with ALRI who needed supplementary oxygen and ventilator management were vitamin D deficient. These findings suggest that the immunomodulatory properties of vitamin D may influence the severity of ALRI.
authors.affiliation: Department of General Pediatrics, Nihon University Nerima-Hikarigaoka Hospital, Nihon University School of Medicine, Tokyo, Japan. y-inamo@pb3.so-net.ne.jp
authors.forename: Yasuji
authors.initials: Y
authors.lastname: Inamo
authors.forename: Maki
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Katsuya
authors.initials: K
authors.lastname: Saito
authors.forename: Rika
authors.initials: R
authors.lastname: Hayashi
authors.forename: Teruaki
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Yayoi
authors.initials: Y
authors.lastname: Yoshino
authors.forename: Koji
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Fuchigami
mesh_terms: D000208:Acute Disease; D001942:Breast Feeding; D001988:Bronchiolitis / Q000453:epidemiology; D005260:Female; D006760:Hospitalization; D006801:Humans; D007223:Infant; D008297:Male; D011863:Radioimmunoassay; D012121:Respiration, Artificial; D012141:Respiratory Tract Infections / Q000097:blood* / Q000453:epidemiology / Q000628:therapy; D012189:Retrospective Studies; D014807:Vitamin D / Q000031:analogs & derivatives / Q000097:blood*; D014808:Vitamin D Deficiency / Q000453:epidemiology
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D