An association of serum vitamin D concentrations < 40 nmol/L with acute respiratory tract infection in young Finnish men

Background: The effects of vitamin D in regulating bone mineralization are well documented. The action of vitamin D as a key link between Toll-like receptor activation and antibacterial responses in innate immunity has recently been shown. The data suggest that differencesintheabilityofhumanpopulationstoproducevitaminD may contribute to susceptibility to microbial infection. Objective: We aimed to explore whether an association exists betweenvitaminDinsufficiencyandacuterespiratorytractinfectionin