Study shows first proof that a safer UV light effectively kills virus causing COVID-19

Researchers offer first proof that Ultraviolet C light with a 222 nm wavelength -- which is safer to use around humans -- effectively kills the SARS-CoV-2 virus
17-Sep-2020 4:20 PM EDT, by Hiroshima University

Newswise — A study conducted by Hiroshima University researchers found that using Ultraviolet C light with a wavelength of 222 nanometers which is safer to use around humans effectively kills SARS-CoV-2 -- the first research in the world to prove its efficacy against the virus that causes COVID-19.

Other studies involving 222 nm UVC, also known as Far-UVC, have so far only looked at its potency in eradicating seasonal coronaviruses that are structurally similar to the SARS-CoV-2 but not on the COVID-19-causing virus itself. A nanometer is equivalent to one billionth of a meter.

An in vitro experiment by HU researchers showed that 99.7% of the SARS-CoV-2 viral culture was killed after a 30-second exposure to 222 nm UVC irradiation at 0.1 mW/cm2. The study is published in the American Journal of Infection Control.

Tests were conducted using Ushio's Care222TM krypton-chloride excimer lamp. A 100 microliter solution containing the virus (ca. 5 × 106 TCID50/mL) was spread onto a 9-centimeter sterile polystyrene plate. The researchers allowed it to dry in a biosafety cabinet at room temperature before placing the Far-UVC lamp 24 centimeters above the surface of the plates.

222 nm vs 254 nm UVC

A wavelength of 222 nm UVC cannot penetrate the outer, non-living layer of the human eye and skin so it won't cause harm to the living cells beneath. This makes it a safer but equally potent alternative to the more damaging 254 nm UVC germicidal lamps increasingly used in disinfecting healthcare facilities.

Since 254 nm UVC harms exposed human tissues, it can only be used to sanitize empty rooms. But 222 nm UVC can be a promising disinfection system for occupied public spaces including hospitals where nosocomial infections are a possibility.

The researchers, however, suggest further evaluation of the safety and effectiveness of 222 nm UVC irradiation in killing SARS-CoV-2 viruses in real-world surfaces as their study only investigated its in vitro efficacy.

###

The Far-UVC research is one of the four COVID-19 studies conducted by Hiroshima University scientists that received funding from the Japan Agency for Medical Research and Development.

Drs. Hiroki Kitagawa, Toshihito Nomura, and Hiroki Ohge of Hiroshima University Hospital's Department of Infectious Diseases, and Dr. Takemasa Sakaguchi of the Hiroshima University Graduate School of Biomedical and Health Sciences were behind the study.

Many laboratories in the university are conducting research on the novel coronavirus under the "Hiroshima University CoV-Peace-Project."

Since its foundation in 1949, Hiroshima University has striven to become one of the most prominent and comprehensive universities in Japan for the promotion and development of scholarship and education. Consisting of 12 schools for undergraduate level and 4 graduate schools, ranging from natural sciences to humanities and social sciences, the university has grown into one of the most distinguished comprehensive research universities in Japan. English website: https://www.hiroshima-u.ac.jp/en

SEE ORIGINAL STUDY




Filters close

Showing results

110 of 4219
Released: 4-Dec-2020 4:30 PM EST
New review confirms disproportionate impact of COVID-19 on Black, Hispanic populations
Oregon Health & Science University

Black and Hispanic populations are disproportionately affected by COVID-19, according to a systematic review published this week.

Newswise: 250647_web.jpg
Released: 4-Dec-2020 4:05 PM EST
For nationalistic regimes, similar COVID-19 policies are the sincerest form of flattery
University of Texas at Arlington

Analysis from a University of Texas at Arlington assistant professor of public policy suggests that nationalistic governments around the globe are more likely to copy other nationalistic governments in responding to the current pandemic.

Released: 4-Dec-2020 3:15 PM EST
New Study Finds Once Hospitalized, Black Patients with COVID-19 Have Lower Risk of Death than White Patients
NYU Langone Health

A team of investigators at NYU Langone Health has found that once hospitalized, Black patients (after controlling for other serious health conditions and neighborhood income) were less likely to have severe illness, die, or be discharged to hospice compared to White patients.

Released: 4-Dec-2020 2:35 PM EST
AANA Commends CDC on Prioritizing COVID-19 Vaccine Distribution to Healthcare Personnel
American Association of Nurse Anesthetists (AANA)

The American Association of Nurse Anesthetists (AANA) commends the U.S. Centers for Disease Control and Prevention’s (CDC's) team of advisors on prioritizing frontline healthcare personnel and residents of long-term facilities for the first phase of the COVID-19 vaccine distribution.

Released: 4-Dec-2020 1:50 PM EST
COVID-19 in Victorian schools and childcare mainly driven by community transmission
Murdoch Childrens Research Institute

Analysis of Victorian data by the Murdoch Children's Research Institute suggests that COVID-19 cases in schools and childcare were mainly driven by community transmission

Released: 4-Dec-2020 12:20 PM EST
Identifying markers of COVID-19 infection using blood tests
University of Seville

Researchers from the Institute of Biomedicine of Seville (IBIS) have presented a study carried out in the Clinical Biochemistry Service of the Virgen del Rocío University Hospital which identifies the values for six biochemical biomarkers that indicate a patient may be infected with SARS-COV-2 (COVID-19).

Released: 4-Dec-2020 12:05 PM EST
Research confirms crucial monitoring assessment is effective for patients with COVID-19
University of Portsmouth

A combined research team from the Universities of Portsmouth and Bournemouth and Portsmouth Hospitals University NHS Trust has shown that an assessment score used to measure a patient's severity of illness can be applied to patients with Covid-19 without modification.

Newswise:Video Embedded flccc-alliance-calls-on-national-health-authorities-to-immediately-review-medical-evidence-showing-the-efficacy-of-ivermectin-for-the-prevention-of-covid-19-and-as-an-early-outpatient-treatment
VIDEO
Released: 4-Dec-2020 12:00 PM EST
FLCCC Alliance Calls on National Health Authorities to Immediately Review Medical Evidence Showing the Efficacy of Ivermectin for the Prevention of COVID-19 and as an Early Outpatient Treatment
Front Line COVID-19 Critical Care Alliance (FLCCC Alliance)

“Following the swi. review— and subsequent guidance— by the NIH and theCDC of Ivermectin, we expect that Ivermectin’s widespread, immediate use willallow for a rapid and safe re-opening of businesses and schools across the nation—and quickly reduce the strain on overwhelmed ICUs.” —FLCCC Alliance

Released: 4-Dec-2020 11:50 AM EST
Immunity passports: Ethical conflict and opportunity
University of the Basque Country

Immunity passports are a means of registering whether an individual has developed immunity to COVID-19 and is therefore unlikely to either catch or spread the disease.


Showing results

110 of 4219

close
1.15526