This type of UVC light kills bacteria and viruses without penetrating the outermost cell layer of human skin.Ī 2017 study showed that 222 nm UVC light killed methicillin-resistant Staphylococcus aureus (MRSA) bacteria just as effectively as a 254 nm UVC light, which would be toxic to humans. Recently, however, researchers have been working with narrow-spectrum UVC rays (207-222 nm). UVC light also works by destroying the DNA of pathogens, which makes it effective against "superbugs."īut this broad-spectrum light is also a health hazard - linked to diseases such as skin cancer and cataracts - and humans cannot be in the room when it is used. This is partly because UVC light can effectively sanitize hard-to-clean nooks and crannies. A study that included 21,000 patients who stayed overnight in a room where someone had been previously treated found that sanitizing a hospital room with UV light in addition to traditional methods of cleaning cut transmission of drug-resistant bacteria by 30%. Powerful UVC light has been regularly used to decontaminate surgical tools and hospital rooms. It is highly effective at decontamination because it destroys the molecular bonds that hold together the DNA of viruses and bacteria, including "superbugs," which have developed a stronger resistance to antibiotics. UVC light has a wavelength of between 200 and 400 nanometers (nm). Because UVC rays have the shortest wavelength, and therefore highest energy, they are capable of killing bacteria and viruses, also called pathogens. The three main types of UV rays are UVA, UVB, and UVC. UV light is highly effective at killing germs
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