5 ms·
30 seconds would be easy enough to fulfill for people queuing up at lines, such as at a point of sale though. Sure, if you're standing next to someone who's inf
by Zancarius 6y ago
30 seconds would be easy enough to fulfill for people queuing up at lines, such as at a point of sale though. Sure, if you're standing next to someone who's infected that's probably not enough time, but combined with other measures it might reduce the spread to others.
One of the studies that was investigating the use of hydroxychloroquine came up with an interesting statistic that had nothing to do with HCQ: They found that individuals with no PPE interacting at less than 6' from someone infected with SARS-CoV-2 had about a 15% chance of contracting it after 10 minutes of exposure. I'd imagine UV would reduce this even further.
This study was covered in Dr. Seheult's update 81[1] video. It's a bit ironic, because the study showed a failure of HCQ, but I'm not completely sure I'd suggest the study itself failed since there's valuable insight that came as a consequence of it!
[1] https://www.youtube.com/watch?v=o5w7FiDJe1g&t=2m32s https://www.youtube.com/watch?v=o5w7FiDJe1g&t=2m32s
- caseysoftware 6y agoIs UV-C dangerous to people? If so, after how long? It'd be interesting to consider this for doctor's waiting rooms, boarding areas for planes & trains, and waiting areas for restaurants. Just waiting for your table or appointment could sanitize you with zero additional effort. Not 100% but reducing the impact/risk in otherwise close quarter space would reduce the overall spread.
- jimsmart 6y agoIt's fairly well accepted that UV-C is carcinogenic to humans. https://www.cancer.org/cancer/cancer-causes/radiation-exposure/uv-radiation.html https://www.cancer.org/cancer/cancer-causes/radiation-exposu...
- Zancarius 6y agoThe sibling comment posted to a general overview of UV light, but I think it's a shame that it seems so dismissive. UVC, while higher frequency, can't penetrate the outer layer of skin[1]. At low energies, I'd imagine it'd be dangerous enough to virions and safe enough to humans for it to be a useful area disinfectant. Most of the studies I've seen use very low power sources that appear to be fairly safe, but I'd imagine there's long term exposure risk. Here's another article[2] worth reading. It appears to me that the specific wavelengths most of the research has focused on is far-UVC which is probably different from the frequencies of UVC currently more well studied. So, I think the answer is "it depends." [1] https://www.klaran.com/is-uvc-safe https://www.klaran.com/is-uvc-safe [2] https://www.discovermagazine.com/health/are-ultraviolet-sanitizing-lights-safe-for-humans https://www.discovermagazine.com/health/are-ultraviolet-sani...