These data will be extremely useful to to develop systems and protocols to contain the COVID-19 pandemic". Andrea Bianco, Technologist at INAF / Brera Astronomical Observatory in Milan / Merate concludes: "With such small doses it is possible to implement an effective disinfection strategy preventing SARS-CoV-2 infection. However a direct measure of the dose necessary to inactivate SARS-CoV-2 had not yet been calculated."We exposed to UV light different concentrations of viruses that were resuspended into acqueous solutions" says Mara Biasin, Professor of Applied Biology of the University of Milan "and we found that a realatively small dose - 3.7 mJ / cm 2, equivalent to that delivered for just a few seconds by an UV-C lamp placed at a few centimeters from the target – is sufficient to inactivate and inhibit the reproduction of the virus by a factor of 1000, regardless of its concentration”. ![]() UV-C light-based systems are broadely used for the disinfection of environments and surfaces in hospitals. ![]() The germicidal power of UV-C light on bacteria and viruses is well known as UV-C light inactivates pathogens as a consequence of its ability to induce the breakage of the molecular bonds of DNA and RNA chains inside microbes. This is confirmed by a multidisciplinary experimental study that involved a group of researchers with different skills and diverse backgrounds from the Italian National Institute for Astrophysics (INAF), the University of Milan, the National Cancer Institute and the Don Gnocchi Foundation in Milan, Italy. ![]() Results show that short wavelength ultraviolet light (254 nm, the so-called UV-C rays), typically produced by low cost Mercury lamps (used for example in aquariums to keep water sanitized) has excellent efficacy in neutralizing the SARS-COV-2 coronavirus.
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