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Exposure to Morning Sunlight/Ultraviolet B (UV-B) Radiations (290–320nm) Decreases the Risk of COVID-19: India (Preprint)


 UNSTRUCTURED
 The novel coronavirus 2019-nCoV/SARS-CoV-2 that has caused the outbreak of the coronavirus disease, COVID-19, has created an alarming situation around the world, including India. Vitamin D is a hormone precursor that plays an important role in adaptive immunity, cellular differentiation, maturation, and proliferation of immune cells. The optimum level of vitamin D could be a potential lead to fight against SARS-CoV-2 infection. In the Indian subcontinent, Vitamin D deficiency prevails in wide-ranging proportions, with a prevalence of 70%–100%. Vitamin D produced in the skin by sunlight/ultraviolet B (UV-B) radiation (290–320nm) may last in the blood twice compared with supplementary vitamin D, wherein consuming vitamin D through supplementary source may lead to toxicity. Balancing vitamin D levels between normal ranges will be effective and cheap to control and/or to prevent respiratory tract infections (RTIs). Although, if we talk about India, it is challenging to provide vitamin D through the supplementary source to every individual, and also it will not be affordable for people of below poverty line (BPL). Therefore, the optimum level of vitamin D could be a potential lead to fight against SARS-CoV-2 infection, which could be achieved by proper exposure to sunlight (preferably in the morning) for 10-20 min daily.
