UVC Disinfection Resources

Prevention of Airborne Transmission of SARS-CoV-2 by UV-C Illumination of Airflow

Abstract: SARS-CoV-2 is frequently transmitted by aerosol, and the sterilization of the virus in airflows has numerous potential applications. We evaluated a UV-C illuminator similar to what might be incorporated into tubing of a mechanical ventilator for its ability to block transmission of the airborne virus from infected to naïve hamsters. Hamsters protected by the UV system were consistently protected from infection, whereas non-protected hamsters uniformly became infected and displayed virus shedding and high burdens of virus in respiratory tissues. The efficiency and speed with which the virus in flowing air was inactivated using this system suggests several applications for mitigating transmission of this virus.

Click on the picture to read the full report.

UVC: Examining the efficacy of the emerging disinfection technology

Covid 19

Gabriele Messina and Gabriele Cevenini of the University of Siena explore the emergence and efficacy of UVC disinfection technologies.

The onset of the COVID-19 pandemic brought with it an unprecedented flurry of new disinfection technologies, most notably those using UVC. For over 10 years, the University of Siena’s Gabriele Messina and Gabriele Cevenini have been collaborating synergistically in research activities focused on the engineering of disinfection techniques with classical (lamps) and innovative (chips and LEDs) UV sources. Click here to read their interview with Health Europa where they speak about the upsurge in UVC disinfection devices and consider some of the key advantages and limitations of these emerging innovations.

Assessment Of UVD Robot Against Reduction Of Multi Drug Resistant Acinetobacter Baumanii On Surfaces

UVD clinical studies.PNG

SUMMARY:

 

The UVD robotic device was placed in a room containing two boards to create shadowed areas. The robot moved in front, between and behind the boards covering all areas of shadowing. Coupons containing a preset number of organisms were placed in container in two chosen positions with differing levels of shadowing and exposed for different time periods. The numbers of organisms remaining after the test period were counted and compared to the control and log reduction calculated. The UVD Robot effected a greater than four log reduction within three minutes. Acinetobacter baumanni showed a greater than 6 and 7 log reduction (respectively) within three minutes.

Click here for the full report.

Evaluation Of The Efficacy Of The UVD Robot To Reduce Numbers Of Candida Auris At Short Time Periods

Candida auris.PNG

SUMMARY:

Stainless steel coupons containing approximately 105 colony forming units (cfu/ml) of Candida auris DSM 21092 (dried) were placed on a surface. They were exposed to UV-C emitted by a UVD Robot for different time periods ranging from 10 minutes to 30 minutes. The numbers of organisms remaining were calculated compared to control coupons which were placed in exactly the same positions but were shielded from the UV by tin foil. The numbers of organisms remaining after the test period were counted and compared to the control and log reduction calculated.

Click here for the full report.

Assessment Of UVD Robot Against Clostridium Difficile Spores On Surfaces

Clostridium difficile spores.PNG

SUMMARY:

The UVD robotic device was placed in a room containing two boards to create shadowed areas. The robot moved in front, between and behind the boards covering all areas of shadowing. Coupons containing a preset number of organisms were placed in container in two chosen positions with differing levels of shadowing and exposed for different time periods. The numbers of organisms remaining after the test period were counted and compared to the control and log reduction calculated. The UVD Robot effected a greater than 4 log reduction on Clostridium difficile spores within five minutes.

Click here for the full report.

Evaluation Of The Efficacy Of The UVD Robot To Reduce Numbers Of Klebsiella Pneumoniae At Short Time Periods

klebsiella pneumoniae.PNG

SUMMARY:

Stainless steel coupons containing approximately 108 colony forming units (cfu) of Klebsiella pneumoniae (carbapenemase producing NDM-1 - CPE) (dried) were placed on a surface. They were exposed to UV-C emitted by a UVD robot for different time periods ranging from less than 10 seconds (drive by) up to three minutes stationary. The numbers of organisms remaining were calculated compared to control coupons, which were placed in exactly the same positions but were shielded from the UV-C by tin foil. The numbers of organisms remaining after the test period were counted and compared to the control and the log reduction calculated. 

Click here for the full report.

Rapid and Complete Inactivation Of Sars-Cov-2 By Ultraviolet-C Irradiation

Sars-cov-2.PNG

SUMMARY:

 

Here, authors describe the inactivation of SARS-CoV-2 in both wet and dry format using radiation generated by a commercially available Signify ultraviolet (UV)-C light source at 254 nm. They show that for contaminated surfaces, only seconds of exposure is required for complete inactivation, allowing for easy implementation in decontamination workows.

Click here for the full report.