2023-07-07 05:00:57
One of the main routes of infection for COVID-19 is aerosol infection by inhaling airborne particles containing the virus. A study by the University of Bristol in the UK revealed what factors determine how long the virus contained in this aerosol survives and maintains its infectivity.
The research team developed a next-generation bio-aerosol technology to create floating particles that mimic the discharged aerosol, and investigated how temperature, particle composition, and environmental factors such as the presence of acidic vapors such as nitric acid affect virus infectivity in 40% low humidity and 90% high humidity environments. It was measured over 40 minutes.
As a result, the infectivity of all mutant strains decreased by 55% in the first 5 seconds in a low humidity environment. In addition, after 40 minutes, all mutant strains showed a loss of more than 95% of infectivity regardless of humidity. As a result of the investigation, it was found that the rate of infectivity attenuation rapidly increased when acid vapor was removed, and 90% of infectivity was lost after 2 minutes. Addition of nitric acid vapor improved infectivity.
The research team said that the results of this study indicate that the discharged high-alkaline aerosol promotes the loss of virus infectivity. In other words, acidic vapors that affect aerosol pH are responsible for maintaining virus infectivity, while ammonia, which is generated to provide alkaline vapors, can have the opposite effect.
The research team said the findings broaden our understanding of how environmental factors affect the airborne stability of COVID-19 and other viruses, and help design better safety and mitigation strategies to reduce infections and the role of carbon dioxide in the risk of COVID-19 infection. and the role of pH will be explored. Related information this placecan be found in
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