id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-286960-uz34fjyp	Ali, Nurshad	Role of vitamin D in preventing of COVID-19 infection, progression and severity	2020-06-20		.txt	text/plain	4029	222	40	This review discussed the possible roles of vitamin D in reducing the risk of COVID-19 and other acute respiratory tract infections and severity. Several studies demonstrated the role of vitamin D in reducing the risk of acute viral respiratory tract infections and pneumonia. Some recent reviews hypothesized that vitamin D insufficiency may compromise respiratory immune function, increasing the risk of COVID-19 severity and mortality [12, 13] . There are also some retrospective studies that determined the correlation of vitamin D levels with COVID-19 severity and mortality [14] [15] [16] [17] [18] [19] [20] [21] [22] The recent outbreak and fast spreading of SARS-CoV-2 are a global health threat with an unstable outcome worldwide. Another study included 25 randomized controlled trials, with 10,933 participants in total from 14 different countries indicated the beneficial effects of vitamin D supplementation in reducing the risk of at least one acute respiratory tract infection [59] .	./cache/cord-286960-uz34fjyp.txt	./txt/cord-286960-uz34fjyp.txt