Study reveals UV LED lights effectively kill the human corona virus


ISLAMABAD, December 21 (online): In a landmark study, researchers found that UV light-emitting diodes (LEDs) can quickly and effectively kill the human coronavirus. If they are effective against SARS-CoV-2, this technology could be an inexpensive way to disinfect surfaces, ventilation systems, and water systems.
It is well known that SARS-CoV-2, which is the virus that causes COVID-19, can spread through respiratory droplets and surfaces contaminated by nasal, mouth, and eye secretions.
According to a review article in the journal Environmental Research, SARS-CoV-2 was present in air samples from areas such as hospital rooms and elevators. It was also measurable in poorly ventilated or crowded spaces.
SARS-CoV-2 was also viable for several days on common surfaces, such as stainless steel and plastic.
Using the human coronavirus OC43 (HCoV-OC43) as a substitute for SARS-CoV-2, the research team tested different UV LED bulbs emitting varying wavelengths — measured in nanometers (nm) — to see which would effectively inactivate the HCoV-OC43 virus.
After exposing viral suspensions placed in darkened tubes to UV LED light, the team found that wavelengths of 285 nm were highly effective at inactivating the virus and almost as effective as wavelengths of 265 nm, inactivating 99.9% of the coronavirus in under 30 seconds.
Furthermore, other viruses showed similar sensitivity to these wavelengths, indicating that this technology could be useful against many types of human coronavirus, including SARS-CoV-2.