e/Vitamin D and influenza

Information
has gloss	eng: Numerous studies link Vitamin D and influenza, as well as Vitamin D and respiratory infections more generally. This vitamin up-regulates genetic expression of various endogenous antimicrobial peptides (AMP), which exhibit broad-spectrum microbicidal activity against bacteria, fungi, and viruses. Reports discussed below indicate that susceptibility to influenza is reduced with higher levels of sun exposure or vitamin D supplementation. Seasonal variation of vitamin D levels in humans can help explain the seasonality of flu epidemics.
lexicalization	eng: Vitamin D and influenza
instance of	(noun) any of a group of organic substances essential in small quantities to normal metabolism vitamin