Scientists at the University of Edinburgh in the UK found that regions with a lot of sunlight experience fewer deaths due to COVID-19. At the same time, a certain subtype of ultraviolet radiation turned out to be a potential protection against coronavirus. This is reported in an article published in the British Journal of Dermatology.
The researchers compared all reported coronavirus-related deaths in the mainland US from January to April 2020 with UV levels in 2,474 US counties over the same period. As a result, it turned out that people living in areas with the highest exposure to ultraviolet A (UVA), which accounts for 95 percent of the sun's UV radiation, had a lower risk of dying from COVID-19 compared to people living in places with lower levels. UVA. The analysis was repeated in England and Italy with the same results.
Scientists took into account such external factors as high risk of illness and death, such as age, ethnicity, socioeconomic status, population density, air pollution, temperature and infection levels in certain areas. However, the effect cannot be explained by higher levels of vitamin D in the body, since its production is influenced by ultraviolet B (UVB), and the study looked at areas with insufficient UVB level for this.
One possible explanation is that exposure to sunlight causes the skin to release nitric oxide, which has been shown in some studies to reduce the ability of the virus to replicate. However, due to the fact that the new scientific work was an observational (and not a controlled trial), the exact cause and effect of the results obtained cannot yet be determined.