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Simulated Sunlight Rapidly Inactivates SARS-CoV-2 on Surfaces

Ratnesar-Shumate et al., The Journal of Infectious Diseases, doi:10.1093/infdis/jiaa274
May 2020  
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Sunlight for COVID-19
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In Vitro study showing that simulated sunlight rapidly inactivates SARS-CoV-2 on surfaces.
2 preclinical studies support the efficacy of sunlight for COVID-19:
Ratnesar-Shumate et al., 20 May 2020, USA, peer-reviewed, 19 authors. Contact:
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Simulated Sunlight Rapidly Inactivates SARS-CoV-2 on Surfaces
PhD Shanna Ratnesar-Shumate, Gregory Williams, Brian Green, Melissa Krause, Brian Holland, Stewart Wood, Jordan Bohannon, Jeremy Boydston, Denise Freeburger, Idris Hooper, Katie Beck, John Yeager, Louis A Altamura, Jennifer Biryukov, Jason Yolitz, Michael Schuit, Victoria Wahl, Michael Hevey, Paul Dabisch
The Journal of Infectious Diseases, doi:10.1093/infdis/jiaa274
Previous studies have demonstrated that SARS-CoV-2 is stable on surfaces for extended periods under indoor conditions. In the present study, simulated sunlight rapidly inactivated SARS-CoV-2 suspended in either simulated saliva or culture media and dried on stainless steel coupons. Ninety percent of infectious virus was inactivated every 6.8 minutes in simulated saliva and every 14.3 minutes in culture media when exposed to simulated sunlight representative of the summer solstice at 40°N latitude at sea level on a clear day. Significant inactivation also occurred, albeit at a slower rate, under lower simulated sunlight levels. The present study provides the first evidence that sunlight may rapidly inactivate SARS-CoV-2 on surfaces, suggesting that persistence, and subsequently exposure risk, may vary significantly between indoor and outdoor environments. Additionally, these data indicate that natural sunlight may be effective as a disinfectant for contaminated nonporous materials.
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