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The influence of temperature, humidity, and simulated sunlight on the infectivity of SARS-CoV-2 in aerosols

Dabisch et al., Aerosol Science and Technology, doi:10.1080/02786826.2020.1829536
Nov 2020  
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Analysis of the effects of temperature, humidity, and simulated sunlight on the decay rate and infectivity of aerosolized SARS-CoV-2 virus particles. The results showed that higher temperature, lower humidity, and higher simulated sunlight (UVB radiation) exposure resulted in faster decay rates and loss of viral infectivity over time. Across the conditions tested, simulated sunlight had the greatest effect, with infectious virus decreasing by 90% in as little as 4.8 minutes under intense summer sunlight conditions. This suggests that environmental factors like sunlight and temperature may play an important role in viral transmission via aerosols.
Dabisch et al., 2 Nov 2020, USA, peer-reviewed, 18 authors.
This PaperSunlightAll
The influence of temperature, humidity, and simulated sunlight on the infectivity of SARS-CoV-2 in aerosols
Paul Dabisch, Michael Schuit, Artemas Herzog, Katie Beck, Stewart Wood, Melissa Krause, David Miller, Wade Weaver, Denise Freeburger, Idris Hooper, Brian Green, Gregory Williams, Brian Holland, Jordan Bohannon, Victoria Wahl, Jason Yolitz, Michael Hevey, Shanna Ratnesar-Shumate
Aerosol Science and Technology, doi:10.1080/02786826.2020.1829536
Recent evidence suggests that respiratory aerosols may play a role in the spread of SARS-CoV-2 during the ongoing COVID-19 pandemic. Our laboratory has previously demonstrated that simulated sunlight inactivated SARS-CoV-2 in aerosols and on surfaces. In the present study, we extend these findings to include the persistence of SARS-CoV-2 in aerosols across a range of temperature, humidity, and simulated sunlight levels using an environmentally controlled rotating drum aerosol chamber. The results demonstrate that temperature, simulated sunlight, and humidity are all significant factors influencing the persistence of infectious SARS-CoV-2 in aerosols, but that simulated sunlight and temperature have a greater influence on decay than humidity across the range of conditions tested. The time needed for a 90% decrease in infectious virus ranged from 4.8 min at 40 °C, 20% relative humidity, and high intensity simulated sunlight representative of noon on a clear day on the summer solstice at 4°N latitude, to greater than two hours under conditions representative of those expected indoors or at night. These results suggest that the persistence of infectious SARS-CoV-2 in naturally occurring aerosols may be affected by environmental conditions, and that aerosolized virus could remain infectious for extended periods of time under some environmental conditions. The present study provides a comprehensive dataset on the influence of environmental parameters on the survival of SARS-CoV-2 in aerosols that can be utilized, along with data on viral shedding from infected individuals and the inhalational infectious dose, to inform future modeling and risk assessment efforts.
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