Sunlight, especially UvA and UvB rays, ‘kills’ the Sars-Cov-2 virus in the concentration it is found in human secretions within minutes. This was demonstrated by a study published in preprint by researchers from the state university of Milan and INAF.
The researchers, we read in the article on the MedArxiv website, have exposed human cells infected with amounts of virus comparable to those found in saliva at different concentrations of different types of UV rays and violet light, then verifying the ability of the virus to replicate. The most effective, say the authors, proved to be UV C rays, which however do not reach the Earth, but also the other types still manage to inhibit the virus. «In particular, our data – reads the conclusions – indicate that solar radiation reaching the surface of the Earth could completely deactivate Sars-Cov-2 in concentrations similar to those found in saliva in a few minutes. In conclusion, for the first time, we have shown that UV radiation is effective in inhibiting Sars-Cov-2 at different wavelengths. This confirms a role for sunlight in the disinfection of external surfaces, and could help explain the seasonality of this virus ».
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