OP 24 June, 2020 - 08:38 AM
Among 5 environmental substances
survival time varies
A widely cited research result can provide some evidence for the survival time of the new coronavirus in different environments.
An article published in the United States "New England Journal of Medicine" on March 17, 2020, compared the time that new coronavirus and SARS virus live on multiple substances in the environment at a specific temperature. The environment of the experiment setting is that the temperature is 21℃-23℃ and the humidity is 40%. There are 5 kinds of substances in the environment, which are aerosol with diameter less than 5 microns, plastic surface, stainless steel surface, copper surface and cardboard surface.
The results show that in aerosols, the survival time of the new coronavirus and SARS virus is similar, and they can survive within 3 hours, and the infectivity decreases slightly with time.
Among the other four environmental substances, the survival and infectivity of New Coronavirus from high to low are: plastic, stainless steel, cardboard and copper. On a plastic surface, the new coronavirus is viable (infectious) within 72 hours. On the surface of stainless steel, the new coronavirus can survive for 48 hours, but the infectious viral load is significantly reduced. On cardboard, the new coronavirus became infectious after 24 hours. On the copper surface, the infectivity of the new coronavirus was undetectable after 4 hours.
Inactivation test of other viruses at different temperatures and humidity
However, this study only shows the survival time and infectivity of the new coronavirus at normal temperature (21℃-23℃), but it does not indicate whether the new coronavirus can maintain longer-term viability and more infectiousness at low temperatures. So, how long can the new coronavirus survive in a frozen environment? At present, there seems to be no relevant literature to record the experimental research in this regard.
In the past, there have been test results of other viruses. An experimental study published in the Journal of Applied Environmental Microbiology in May 2010. The original research goal was to point to the SARS virus. However, due to the high infectivity and difficulty of obtaining the SARS virus, the researchers used two other viruses-gastrointestinal Inflammation virus (TGEV) and mouse hepatitis virus (MHV) were tested in substitution, and the survival of these two viruses on the surface of stainless steel under certain temperature and humidity was obtained.
The overall situation is that in an environment of 4°C and a relative humidity of 20%, gastroenteritis virus (TGEV) and mouse hepatitis virus (MHV) can survive for 28 days and have the lowest degree of inactivation in an environment of a relative humidity of 20%. At all humidity levels, virus inactivation is faster at 20°C than at 4°C, and at 40°C is faster than at 20°C. And, the higher the relative humidity within a certain range, the faster the virus inactivation. At a relative humidity of 50%, the virus inactivates fastest. This study shows that the higher the temperature, the more unfavorable for the survival of gastroenteritis virus (TGEV) and mouse hepatitis virus (MHV), and the environment with higher relative humidity is also unfavorable for the survival of these two viruses.
However, this study is not directed at the new coronavirus and SARS virus, but only the results of research on the alternative viruses gastroenteritis virus and mouse hepatitis virus, so it cannot fully explain the problem. Li Lanjuan, an academician of the Chinese Academy of Engineering, also pointed out recently that the new coronavirus is a new virus. It has only been 8 months since its emergence, and its understanding and low temperature tolerance need further research.
Summer high temperature may not inhibit the infectivity of New Coronavirus
source；https://www.bestsitenet.com
survival time varies
A widely cited research result can provide some evidence for the survival time of the new coronavirus in different environments.
An article published in the United States "New England Journal of Medicine" on March 17, 2020, compared the time that new coronavirus and SARS virus live on multiple substances in the environment at a specific temperature. The environment of the experiment setting is that the temperature is 21℃-23℃ and the humidity is 40%. There are 5 kinds of substances in the environment, which are aerosol with diameter less than 5 microns, plastic surface, stainless steel surface, copper surface and cardboard surface.
The results show that in aerosols, the survival time of the new coronavirus and SARS virus is similar, and they can survive within 3 hours, and the infectivity decreases slightly with time.
Among the other four environmental substances, the survival and infectivity of New Coronavirus from high to low are: plastic, stainless steel, cardboard and copper. On a plastic surface, the new coronavirus is viable (infectious) within 72 hours. On the surface of stainless steel, the new coronavirus can survive for 48 hours, but the infectious viral load is significantly reduced. On cardboard, the new coronavirus became infectious after 24 hours. On the copper surface, the infectivity of the new coronavirus was undetectable after 4 hours.
Inactivation test of other viruses at different temperatures and humidity
However, this study only shows the survival time and infectivity of the new coronavirus at normal temperature (21℃-23℃), but it does not indicate whether the new coronavirus can maintain longer-term viability and more infectiousness at low temperatures. So, how long can the new coronavirus survive in a frozen environment? At present, there seems to be no relevant literature to record the experimental research in this regard.
In the past, there have been test results of other viruses. An experimental study published in the Journal of Applied Environmental Microbiology in May 2010. The original research goal was to point to the SARS virus. However, due to the high infectivity and difficulty of obtaining the SARS virus, the researchers used two other viruses-gastrointestinal Inflammation virus (TGEV) and mouse hepatitis virus (MHV) were tested in substitution, and the survival of these two viruses on the surface of stainless steel under certain temperature and humidity was obtained.
The overall situation is that in an environment of 4°C and a relative humidity of 20%, gastroenteritis virus (TGEV) and mouse hepatitis virus (MHV) can survive for 28 days and have the lowest degree of inactivation in an environment of a relative humidity of 20%. At all humidity levels, virus inactivation is faster at 20°C than at 4°C, and at 40°C is faster than at 20°C. And, the higher the relative humidity within a certain range, the faster the virus inactivation. At a relative humidity of 50%, the virus inactivates fastest. This study shows that the higher the temperature, the more unfavorable for the survival of gastroenteritis virus (TGEV) and mouse hepatitis virus (MHV), and the environment with higher relative humidity is also unfavorable for the survival of these two viruses.
However, this study is not directed at the new coronavirus and SARS virus, but only the results of research on the alternative viruses gastroenteritis virus and mouse hepatitis virus, so it cannot fully explain the problem. Li Lanjuan, an academician of the Chinese Academy of Engineering, also pointed out recently that the new coronavirus is a new virus. It has only been 8 months since its emergence, and its understanding and low temperature tolerance need further research.
Summer high temperature may not inhibit the infectivity of New Coronavirus
source；https://www.bestsitenet.com
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