Does UV Light Kill Viruses and Germs?

An ultraviolet-light-emitting robot named Rosie disinfects a hospital room in Milford, Massachusetts. Photo: Essdras M Suarez/Boston Globe via Getty Images

We first heard about the disinfecting powers of UV-C light (ultraviolet light with a wavelength between 200 and 280 nanometers — and the same light that causes sunburn and skin-cell mutation in humans) while talking to certified sex coach Gigi Engle about the best rabbit and bullet vibrators you can buy online. Engle uses a UV-light sterilization pouch to clean her sex toys of bacteria that could lead to yeast infections or bacterial vaginosis. According to her, UV light is much more convenient than soap and water. “You just need to wipe off your toys and pop them in the pouch and you’re done,” she says. That made us wonder: If UV light is better than soap at cleaning sex toys, what else might it be useful for cleaning?

To find out, we talked to four medical professionals (and one Strategist staffer who swears by her UV-light-blasting water bottle). Eric Lee, a St. Louis–based physician, says that “UV light, the type used in most common devices on the market to clean household objects, has been shown to be effective in laboratory studies at killing bacteria on computer screens, toothbrushes, and other objects. It has also been shown to affect viruses in similar ways that it affects bacteria.” According Alex Berezow, a microbiologist who has written on the topic, “UV light is lethal to bacteria and viruses because of its high frequency that scrambles and damages their nuclear material. When it damages the DNA (or RNA) code of these pathogens, it also triggers lethal mutations that prevent them from reproducing properly.” (As we all try to protect ourselves from unnecessary coronavirus exposure, we also asked if the existing technology was effective against it. While our experts say there haven’t been conclusive tests showing that UV light can kill the coronavirus, Berezow says “UV light kills everything: bacteria, fungi, viruses. It should kill coronavirus.” What we do know for sure is that it is effective against other viruses like the flu.)

With their advice in mind, we found a number of devices that use UV light to kill a range of dangerous bacteria and viruses from MRSA to E. coli. Like in hospitals, where UV-light-emitting robots quite literally zap operating rooms of all pathogens. According to CNBC, manufacturers of these robots, from Danish company UVD Robots and Texas based Xenex Disinfection Services, believe that they are effective at killing the coronavirus and are sending shipments of the disinfecting devices to Italy and East Asia in an effort to stop further spread in hotels and hospitals. In addition, Boeing has designed a prototype for a self-cleaning airplane bathroom that uses UV light to disinfect after each use. Outside of those industrial uses, there are a bunch of portable UV sanitizing boxes, wands, and water bottles that claim to kill 99.9 percent of bacteria and viruses on phones, toothbrushes, pacifiers, and a number of other surfaces. None of them have been proven to kill the coronavirus, but a number of them have been put through rigorous third-party lab testing to support their claims.

Linda Lee, environmental health expert and chief medical affairs and science officer at UV Angel, says UV light and chemicals like bleach or ethanol are equally effective methods for sanitizing surfaces. She suggests using whatever cleansing method is available to you, but points out that, in some situations, UV treatment can be superior. “For instance, chemical treatment might be difficult for a baby’s pacifier, because the way chemicals work, there’s a residual left behind that continues to treat the surface,” she says. So maybe don’t scrub your baby’s pacifier with a Clorox wipe and then hand it right back to them. Another benefit of UV light over wipes or paper towels is that you create less waste. Although Linda Lee has not tested this product, Munchkin claims that it has been put through rigorous testing by an independent lab.

read full article at NYMAG