Cone Shape Structure of Ultraviolet C Device: Effectiveness Against Surrogate Pathogen during COVID-19 Pandemic

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Rawiwan Thanprasertsuk
Tanittha Chatsuwan
Kanitha Patarakul
Jenyuk Lohwacharin
Adisak Duangkaew
Somrat Charuluxananan
Pannika Vorapaluk


Introduction: COVID-19 has been declared as a pandemic. Unavoidable roles of anesthesiologist are anesthesia and endotracheal intubation in infected patients requiring surgical operation and suffering respiratory failure, respectively. Ultraviolet C (UVC) has been recommended for disinfecting the operating room in COVID-19 situation. Objective: To study the effectiveness of our UVC device in disinfection of Pseudomonas aeruginosa, which was used as a surrogate of SARS-CoV-2. Materials and Methods: The UVC device was comprised of 12 UVC lamps. The lamps were assembled in cone shaped. The power and timer of UVC lamps were controlled by mobile application. We studied disinfection effect of UVC device on Pseudomonas aeruginosa which generally tolerates to UVC more than coronavirus and is a common etiology of hospital acquired infection. The microbes were placed on glass and stainless-steel surfaces at 0.5-3 meters from the UVC device. Results: The shorter distance and the longer exposure time were shown to increase killing effect of the device. Irradiation using this UVC device for 3 minutes eradicated P. aeruginosa on both glass and stainless-steel surfaces at least 99.9% (3 log10 reduction) at all tested distances. The effectiveness of killing was appeared to be higher on the bacteria placed on stainless-steel than on the glass surface. Conclusion: This UVC disinfection device was effective in eradicating P. aeruginosa, which is more resistant to UVC than coronavirus. Using this UVC device to disinfect the operating room and other infected area may benefit in COVID-19 situation

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