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UV-C radiation against SARS-CoV-2 coronavirus

The SARS-CoV-2 coronavirus that causes COVID-19 disease has already reached most countries in the world. Every day there are more people infected, and the number of deaths caused by the virus increases. Coronavirus is dangerous among others because it is a new and still poorly understood pathogen. The fight against this virus should be based on quick and decisive action. Based on research, it turns out that a very effective weapon against the spread of Wuhan coronavirus is UV-C radiation, which quickly and thoroughly cleanses the room of dangerous pathogens.

What are coronaviruses?
Coronaviruses are a large group of RNA viruses that cause about 10-20 percent of all colds. They can also cause more serious diseases, such as: Middle Eastern respiratory syndrome or severe acute respiratory distress syndrome.
SARS-CoV-2 coronavirus (called the COVID-19 coronavirus by the name of the disease it causes) is a new and still poorly known coronavirus that was discovered at the end of December 2019 in Wuhan, Hubei, China. It belongs to the same type of viruses as SARS and MERS.

Survival of coronavirus on surfaces
Coronaviruses such as SARS and MERS can survive on different surfaces for up to nine days, which means that they may be able to infect for such a long period if they occur on surfaces outside the host's body. For SARS coronavirus, surface survival can be up to nine days, according to Dr. Charles Chiu, professor of infectious diseases at the University of California, San Francisco and director of the USCF-Abbott Viral Diagnostics and Discovery Center.
The World Health Organization (WHO) reports that the duration of viruses on objects depends on their temperature and humidity.

UV-C radiation - rapid destruction of pathogens
Time is of the essence in stopping the spread of the epidemic. Disinfection of the environment can be carried out using various fogging devices and standard cleaning methods, but these are very time-consuming and expensive solutions. UV-C radiation is a very effective method of decontaminating the environment during an epidemic. UV-C destroys viruses due to high-energy electrons passing or penetrating the protein shell towards the nucleoid containing the nucleic acid. Viral RNA is then destroyed. The time interval necessary to destroy a microorganism depends on the time of exposure and the distance from the source of UV-C radiation from the microorganism.

ROBOT UVD - a fully autonomous device
The UVD robot is the only device capable of changing the position of the UV-C radiation source mounted in a specific area of the upper part of the robot platform, which solves the problem of shading and proximity of the surface. The position change can be repeated many times, ensuring that all surfaces and cubic meters of air are exposed to radiation of the maximum intensity possible.
This automated system is able to inactivate MHV-A59 and MERS-CoV viruses on surfaces with a MERS reduction of more than 5 log10 within 5 minutes of UV-C exposure.

Research
Based on the laboratory test, the effectiveness of the automated UVC-C system for the whole room or any disinfection system of the whole room against viruses, such as MHV-A59, MERS-CoV and SARS-CoV, was confirmed.
The use of a UV-C disinfection system throughout the room during the appearance of MERS can prevent the spread of the virus and protect staff and patients.
The conducted tests regarding the disinfection possibilities of the UV-C emitting unit against MHV-A59 and MERS-CoV- viruses showed that the MHV-A59 virus titer was reduced by 2.71 log10 in 5 minutes and by 6.11 log10 in 10 minutes of exposure , leading to undetectable values for MHV-A59. Just five minutes of exposure led to undetectable MERS-CoV values that remained at this level after 30 minutes of total exposure with a 5.9 log10 reduction (Bedell et al. 2016).

It has been shown that for other UV-C emitting units using the same wavelength, similar data was also obtained for a wide spectrum of differentiated bacteria, fungi and viruses (Vatansever et al. 2013), therefore the results obtained after using the UVD robot should be very similar.The generated UV-C radiation significantly differs only in the method of its distribution.
 
Sources
Bedell, K., Adam BS., Buchaklian, H and Perlman, S. (2016) Efficacy of an Automated Multiple Emitter Whole-Room UltravioletC Disinfection System Against Coronaviruses MHV and MERS-CoV. Infect Control Hosp Epidemiol; 37:598–59.
Dowell S, Simmerman J, ErdmanD, Wu J, Chaovavanich A, Javadi M, et al. (2004) Severe acute respiratory syndrome coronavirus on hospital surfaces. Clin Infect Dis; 39:652-7.
Lai MY, Cheng PK, Lim WW (2005). Survival of severe acute respiratory syndrome coronavirus. Clin Infect Dis; 41; e67-71.
Otter JA, Donskey C, Yezli S, Douthwaite S, Goldenberg SD, Weber DJ. (2016) Transmission of SARS and MERS coronaviruses and influenza virus in healthcare settings: the possible role of dry surface contamination. J Hosp Inf; 92; 235-50.
van Doremalen N, Bushmaker T, Munster VJ. (2013) Stability of Middle East respiratory syndrome coronavirus (MERSCoV) under different environmental conditions. Eurosurv.; 19;18(38).
Vatansever F, Ferraresi C, de Sousa MV, Yin R, Rineh A, Sharma SK, Hamblin MR. (2013) Can biowarfare agents be defeated with light? Virulence; 4:796-825.

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