VDR and dengue disease: The other articles included in the Ahmed et al.15 review described laboratory studies of dengue virus–infected cells,29,30 observational studies assessing associations between vitamin D receptor polymorphisms and DF disease in humans,31,32 laboratory studies of dengue virus–infected mice,33–35 and noninterventional studies analyzing the serum or plasma components of DF patients.36–41 None of these studies directly investigated any clinical interventions for DF.