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flammation, retinopathy may offer insight into disease pathogenesis in patients with severe COVID-19. The relationship between 25-hydroxyvitamin D3 (25(OH)D), the surrogate marker for vitamin D , serum concentration and COVID-19 has come to the forefront as a potential pathway to improve COVID-19 outcomes. The current evidence remains unclear on the impact of vitamin D status on the severity and outcomes of COVID-19 infection. To explore possible association between low 25(OH)D levels and risk of developing severe COVID-19 (i.e. need fo