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- W2897319957 abstract "Background It is uncertain whether vitamin D can reduce respiratory infection. Objective To determine whether vitamin D supplementation reduces influenza and other upper viral respiratory tract infections. Methods A total of 1300 healthy children and adolescents between the ages of 3 and 17 years were randomized to vitamin D (14 000 U weekly) or placebo for 8 months in Vietnam. The primary outcome was reverse transcriptase ( RT )‐ PCR –confirmed influenza infection, and the coprimary outcome was multiplex PCR –confirmed non‐influenza respiratory viruses. Participants, caregivers, and those assessing outcomes were blinded to group assignment. Results A total of 650 children and adolescents were randomly assigned to vitamin D and 650 to placebo. The mean baseline serum 25‐hydroxyvitamin D levels were 65.7 nmol/L and 65.2 nmol/L in the intervention and placebo groups, respectively, with an increase to 91.8 nmol/L in the vitamin D group and no increase, 64.5 nmol/L, in the placebo group. All 1300 participants randomized contributed to the analysis. We observed RT ‐ PCR –confirmed influenza A or B occurred in 50 children (7.7%) in the vitamin D group and in 43 (6.6%) in the placebo group (hazard ratio [ HR ]: 1.18, 95% CI : 0.79‐1.78). RT ‐ PCR –confirmed non‐influenza respiratory virus infection occurred in 146 (22.5%) in the vitamin D group and in 185 (28.5%) in the placebo group (hazard ratio [ HR ]: 0.76, 95% CI : 0.61‐0.94). When considering all respiratory viruses, including influenza, the effect of vitamin D in reducing infection was significant, HR : 0.81, 95% CI : 0.66‐0.99. Conclusion Vitamin D supplementation did not reduce the incidence of influenza but moderately reduced non‐influenza respiratory viral infection." @default.
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- W2897319957 date "2019-01-04" @default.
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- W2897319957 title "Effect of Vitamin D supplementation to reduce respiratory infections in children and adolescents in Vietnam: A randomized controlled trial" @default.
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- W2897319957 doi "https://doi.org/10.1111/irv.12615" @default.
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