“…Indeed, a recent clinical trial showed that vitamin D 3 supplementation was associated significantly with enriched immune function, transcriptional regulation, cell cycle activity, DNA replication, and response to stress, and a 2014 review found that 13 of 18 studies examined, showed that vitamin D deficiency was prevalent among children with acute respiratory infections . Also, a study performed in hospitalized children classified as with acute lower respiratory infections (ALRIs) versus non‐ALRI‐classified hospitalizations, found that 32% (24/74) children had 25OHD 3 levels <75 nmol/L compared with 47% (14/30) among children hospitalized for other reasons …”