Since the case of highly infectious viral pneumonia due to virus infection in Wuhan, Hubei Province was first reported in December 2019, it has greatly affected the operation of the national economy and people's production and life with its rapidity of transmission, diversity of transmission channels, and resistance to drugs [1-3].In January 2020, the virus was formally named by the World Health Organization (WHO) as 2019-new coronavirus ( 2019-nCOV) [2]. Novel coronaviruses are viruses that have never been detected in humans before, and therefore there are no specific targeted therapies. In just two months since the discovery of the new coronavirus, the National Health Commission's diagnostic and treatment protocol for pneumonia infected by the new coronavirus has been updated to the fifth edition [4], showing that the knowledge of China's medical staff about this new virus is constantly and rapidly deepening, and its physicochemical properties are constantly being revealed by researchers, so I believe that the day of full and effective control of the new coronavirus will not be too far away.

During the 2 months of the virus‘ ravages, a large number of virus prevention and control measures have been proposed and applied to daily life, such as masks, hand washing, isolation, etc., all of which are aimed at cutting off the virus’ transmission channels and protecting susceptible people. The means of control mentioned above are passive defences in the process of virus transmission, preventing, as far as possible, people from being infected in an environment where the virus is present. Cutting off the infectious agent is also a very crucial part of the means of prevention and control of infectious diseases. If the infectious agent can be cut off, the spread of the virus will become a non-starter, and the speed of its spread will be greatly reduced, or even terminated.

For the physical and chemical properties of the new coronavirus researchers are still in the process of intensive research, its quantifiable indicators are very few, currently known for the coronavirus family in the SARS virus and the Middle East Respiratory Syndrome (MERS-) coronavirus research shows that the above two types of coronaviruses are very sensitive to ultraviolet light and heat, under certain conditions can be ultraviolet light or heat inactivation [4-], so it can be inferred that for the new coronavirus, the transmission rate will be greatly reduced, and even terminated. 6], so it can be inferred that for the effective control of the current novel viruses, these two means have great potential.

Looking at thermal sterilisation first, coronaviruses (SARS and MERS, 2019-COV and other homologous data are not available) can be effectively killed by heating the virus survival environment to 56°C and maintaining it for 30 minutes [4-6]. This means of sterilization, operation is relatively cumbersome, timeliness is not high, for open places and large-scale equipment sterilisation occasions under the application of the force is not critical, so in the application of the more limited. Ultraviolet sterilisation as a means of sterilization commonly used in medicine, because of its direct operation against bacteria, viruses and other microbial DNA fragments, with excellent bactericidal universality, almost all viruses, bacteria microorganisms can play a role in killing, to avoid biological resistance, is an effective means of sterilization. Moreover, since the effect of UV sterilization is determined by the energy of the deep ultraviolet rays radiated by the UV light source, it can be convenient to propose different response designs and programmes for different applications and different objects to be killed, and its application potential is very large.

Based on the above analyses, HCT believes that UV sterilisation should receive more attention and application in the prevention and control of novel coronavirus transmission, mainly based on the following reasons:

Firstly, it is known that the main ways of new coronavirus transmission are respiratory droplet transmission and contact transmission [4], for these two modes of transmission, ultraviolet light can play a positive role. For example, for respiratory droplet transmission, the virus exists in the air along with the droplets, and the healthy people are infected after inhaling the contaminated air, and UV sterilisation can be attached to the air circulation system [8], such as for the large space application. Air circulation system [8], for example, for large space applications of central air conditioning circulation system, indoor air purifier, wall-mounted air conditioning and other air circulation system, as well as for personal application of local air circulation sterilisation masks, the air flow through the air circulation system for sterilisation, to achieve the purpose of bacterial viruses, inhibit the spread of the purpose. In terms of the effectiveness of ultraviolet sterilisation products, the ultraviolet sterilisation module designed for air conditioners, air purifiers and other products has been tested to meet the national standard of indoor sterilisation efficiency of more than 70%. For the more infectious viruses, you can purposefully increase the overall power of the ultraviolet sterilisation module, the sterilisation efficiency is further enhanced. For some of the larger traffic occasions such as airports, stations, hospitals, shopping malls and other closed spaces, because the spread and the number of infected groups is more, it is very necessary to add ultraviolet germicidal module in the air circulation system, in order to inhibit the spread of viruses from the source, to provide protection for the health of the nation.

Secondly, for contact transmission of viruses and bacteria, ultraviolet germicidal also has a larger application scenario. Contact transmission is mainly due to the healthy person contact with the virus, bacteria and other surfaces, due to the lack of timely disinfection and cleaning, and then infected with disease. Then for the virus bacteria where the surface of the bacteriostatic inhibition is a key part. For example, the public lift buttons, escalators, handrails and door handles, etc., are in and out of public places where people contact the high incidence, if there is a disease-causing bacteria, the presence of viruses, then the spread of the crowd will be rapidly expanding, if the high incidence of contact with the surface of the application of ultraviolet light sterilisation can effectively kill and inhibit the number of disease-causing viruses and bacteria to achieve the control of the source of viruses to inhibit the dissemination of the purpose. According to the application characteristics of shopping mall escalators, specially designed for the lift handrail with dynamic bactericidal ultraviolet module, which has been certified by a third-party organisation in terms of bactericidal effectiveness.

Finally, for some people's daily contact frequency, and there is a greater risk that may carry a bacterial virus on the surface, such as our daily use of mobile phone surfaces, dining out when using dishes, cups and chopsticks and other personal items sterilisation, the design of portable portable sterilisation products, can be thoroughly sterilised on these suspicious surfaces, to the personal hygiene and then add a handful of insurance. Make travelling more hygienic and safe.

UVC deep ultraviolet germicidal disinfection in the current epidemic environment of the application of thought

Ultraviolet sterilisation, as a broad-spectrum means of sterilisation, in the control of killing a variety of known and unknown bacterial viruses compared to other ways of sterilisation has a natural advantage, such as the new coronavirus, as long as the virus is still in the virus category, the ultraviolet light will be able to play a role in his role, will be able to control the spread of its infection, so when all kinds of epidemics occur, ultraviolet light should be rushed to the front line of the natural The main force application, rather than now so in a supplementary bactericidal status. Some products can even be considered as a strategic reserve. Such as air, water sterilisation products. Once there is a similar epidemic, as a barrier to the spread of germs in the media of these bactericidal products can immediately come in handy.

UVC deep ultraviolet germicidal disinfection in the current epidemic environment of the application of thought

Ultraviolet light in the application of bactericidal far more than the scenes mentioned in this article, previously because of the limitation of ultraviolet light source - mercury lamp function limitations, resulting in ultraviolet bactericidal applications have been limited to water purification and other aspects of the treatment. In recent years, with the introduction of deep ultraviolet LED as a new type of ultraviolet light source and the continuous improvement of ultraviolet power, the application of the scene should be able to have a broader application space. With the continuous development of UV LED technology, I believe there will be a day when UV LED can be like today's LED lighting, penetrate into all aspects of people's lives, and make due contribution to human health.