Does solar ultraviolet radiation play a role in COVID-19 infection and deaths? An environmental ecological study in Italy.

This is particularly true for Italy, where UV-B irradiance reveals large differences during the year, with winter months characterised by an UV irradiance about tenfold lower than summer months ( Calgani et al., 2016 ); the same study reports, as a consequence, that the seasonal stratification of vitamin D concentrations revealed an evident trend with the minimum mean value recorded in April and a maximum mean value obtained in September.

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