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Serum 25-Hydroxyvitamin D and the Incidence of Acute Viral Respiratory Tract Infections in Healthy Adults – Source: PloS One, Jun 14, 2010

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By James R Sabetta, et al. • www.ProHealth.com • June 17, 2010


[Note: To read the full text of this article free, click here.]

Background: Declining serum concentrations of 25-hydroxyvitamin D seen in the fall and winter as distance increases from the equator may be a factor in the seasonal increased prevalence of influenza and other viral infections.

This study was done to determine if serum 25-hydroxyvitamin D concentrations correlated with the incidence of acute viral respiratory tract infections.

Methodology/Findings: In this prospective cohort study serial monthly concentrations of 25-hydroxyvitamin D were measured over the fall and winter 2009-2010 in 198 healthy adults, blinded to the nature of the substance being measured.

The participants were evaluated for the development of any acute respiratory tract infections by investigators blinded to the 25-hydroxyvitamin D concentrations. The incidence of infection in participants with different concentrations of vitamin D was determined. One hundred ninety-five (98.5%) of the enrolled participants completed the study.

Light skin pigmentation, lean body mass, and supplementation with vitamin D were found to correlate with higher concentrations of 25-hydroxyvitamin D.

Concentrations of 38 ng/ml or more were associated with a significant (p<0.0001) two-fold reduction in the risk of developing acute respiratory tract infections and with a marked reduction in the percentages of days ill. [Note: Of the high-D individuals (38 ng/ml or more), 5.5% developed viral infection, vs. 17.8% of the others – who were well over three times as likely to become ill. The probability statistic (p< 0.0001) means the odds that this finding resulted by chance are less than 1 in 10,000. The authors note that “the effect size was so large that it was demonstrated with confidence in a relatively small study.”]

Conclusions/Significance: Maintenance of a 25-hydroxyvitamin D serum concentration of 38 ng/ml or higher should significantly reduce the incidence of acute viral respiratory tract infections and the burden of illness caused thereby, at least during the fall and winter in temperate zones.

The findings of the present study provide direction for and call for future interventional studies examining the efficacy of vitamin D supplementation in reducing the incidence and severity of specific viral infections, including influenza:

• In the general population,

• And in subpopulations with lower 25-hydroxyvitamin D concentrations, such as pregnant women, dark skinned individuals, and the obese.

Source: PloS One, Jun 14, 2010. doi:10.1371/journal.pone.0011088, by Sabetta JR, DePetrillo P, Cipriani RJ, Smardin J, Burns LA, Landry ML. Departments of Medicine and Laboratory Medicine, Yale University School of Medicine, New Haven, Connecticut; Section of Infectious Diseases, Greenwich Hospital, Greenwich, Connecticut; Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina. [Email: jsabettamd@yahoo.com]





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