


Similar observations have been made by Panagiotou et al. Russian hospitals observed that the likelihood to have severe COVID-19 increases by the factor of 5 if vitamin D is deficient ( Karonova et al., 2020). A recent clinical study from Iran (n = 611) stated that there were no COVID-19 deaths in a hospital if serum 25(OH)D concentrations were higher than 41 ng/mL and patients were younger than 80 ( Maghbooli et al., 2020). (2020) have critically discussed the association of vitamin D with viral infections. In a recently published review article, Sharma et al. More and more voices are being raised supporting the supplementation of Vitamin D 3 to counter the pandemic outbreak with the correlated mortality rates as well as economic and social consequences ( Grant et al., 2020). Up to date, there is no treatment to decrease the virus-caused infection and mortality rates ( Cortegiani et al., 2020). The COVID-19 pandemic is a current pandemic of high international interest, caused by the coronavirus strain SARS‑CoV‑2.
