Ultraviolet rays have an effect on the Sars-CoV-2 Coronavirus epidemic. This was revealed by a study by an Italian team made up of doctors and astrophysicists. The authors are part of the University of Milan (“Luigi Sacco” department), the National Institute of Astrophysics (INAF) and the National Cancer Institute. Mario Clerici, first signatory of the works, is full professor of Immunology at the University of Milan and scientific director of the Don Gnocchi Foundation. “We used type C UV lamps (UV-C LEDs), those that do not reach Earth because they are blocked by the atmosphere. To understand each other, they are similar to the devices used to purify aquariums. In the experiment, drops of liquid of different sizes (droplets) containing Sars-CoV-2 were placed under the lamps, to simulate what can be put on speaking or with a sneeze.

We evaluated a very low dose of the virus (the one that can be in a room where a positive is present), a hundred times higher dose (that can be found in a subject with a serious form of Covid-19) and a thousand times more high, impossible to find in a human being or in any real situation. In all three cases, the viral load was inactivated in a few seconds to 99.9% by a small amount of UVC rays: 2 millijoules per square centimeter are enough ”, he explained in an interview with Corriere della Sera.