UV light is lethal to bacteria and viruses because of its high frequency of scrambles and damaging their nuclear material. When it damages the DNA (or RNA) code of these pathogens, it triggers lethal mutations that prevent them from reproducing correctly. When microorganisms are unable to multiply, it is considered dead since they cannot reproduce within a host and is no longer infectious.
UV light can kill a range of dangerous bacteria and viruses from MRSA to E.coli.UV light should never be used on the skin or any other part of the body. It would help if you were careful not to look at the UV light device when using it to clean objects or surfaces. Exposure to UV light inactivates microbes in an effective to achieve no-touch disinfection.
Yes, it is effective. UVC at 254nm is effective against all foodborne pathogens, natural microbiota, molds, yeasts. Because microorganisms come with different sizes and shapes that affect their UV absorption, the required time for killing each species varies. Superbug is a strain of bacteria that is resistant to most antibiotics. Microorganisms and viruses continue to develop new resistance mechanisms that help them fend off the effects of antimicrobials and antivirals. That is, superbugs are resistant to almost every available means of chemical treatment. It is essential to make sure the surfaces you want to sterilize are directly in line with UV light. The effectiveness of UV sterilization can be increase if you use multiple UV bulbs that generate UV lights at different angles.
It takes 5-10 minutes to sterilize surgical instruments in a medium-sized UV box, and 30 minutes of exposure time is adequate in disinfecting an eight food biosafety cabinet in the lab. These are reduction percentages of various microorganisms when kept at a distance of 2 inches from the UV light source for two minutes. 6 log reduction in MRSA. 99.9% reduction in gram-positive bacteria and fungi. 99.99% reduction on gram-negative bacteria, a 90% reduction in spore-forming fungi.
Follow manufacture instruction on distance, exposure time and safety precautions related to any device you use. Always use protective shields and eyewear and avoid direct exposure of UV rays on skin and eyes.