Sunlight seems to deactivate corona virus that cause COVID-19, according to a study.
Scientists find imitation sunlight “SARS- which is rapidly attenuated”CoV-2 on stainless steel coupons in the laboratory. This finding was published in Journal of Infectious Diseases.
Previous studies showed that SARS-CoV-2 can survive under the right conditions on a surface in a non-porous room for days, the authors explain in their paper. One widely referenced study is published in Journal of New England Medicine shows germs can live up to three days in plastic and steel, compared to 24 hours on cardboard, four hours in copper, and up to three hours as aerosols.
However, in the latest guidelines published earlier this month that made headlines on the last day, the U.S. Centers for Disease Control and Prevention The United States says that the virus does not spread easily from touching surfaces or objects.
To explore whether SARS-CoV-2 can survive in conditions such as outdoors, the team uses devices that simulate natural sunlight, including ultraviolet light. They also control the temperature and humidity in the lab room. The virus grows both in laboratory culture and in liquids that resemble human saliva. The sample is then dried on a stainless steel coupon.
Contaminated coupons stick to the mounting strip and attach to the walls of the room, and are exposed to light for different periods of time, ranging from 2 – 18 minutes. A set of virus-laden coupons was put into the room for 60 minutes in the dark as a control.
Ultraviolet B (UVB) Rays found quickly deactivate SARS-CoV-2, according to the team. Under conditions that resemble midday sun on the longest day of the year at 40 degrees north latitude, 90 percent of the virus is inactive every 6.8 minutes in saliva.
Sunlight representing the winter solstice at the same latitude deactivates the virus every 14.3 minutes in saliva. SARS-CoV-2 inactivity is twice as large in saliva than in culture media for reasons that are not immediately apparent. The virus on the coupon is kept in the dark, meanwhile, is virtually unchanged.
The findings suggest that the ability of the virus to spread may be “significantly reduced” in outdoor conditions when exposed to direct sunlight, compared to indoor conditions, the authors write. “In addition, this data provides evidence that natural sunlight might be effective as a disinfectant for contaminated non-porous material,” they said.
But the team stressed that the results could be different in a real-world scenario. They said: “While a significant level of virus inactivation was observed within a few minutes at all simulated sunlight levels investigated, it should be noted that the duration of time each day is outside UVB the level exceeded that used in this study depends not only on the time of year, but also on local weather conditions, especially cloud cover.
“Thus, it is possible that significant daily variability might exist in SARS-persistenceCoV-2 on surfaces in the outside environment. “
The team notes that they use one measure of virus droplets, and future research can explore how this can affect deactivation. And while they try their best to simulate saliva, it might be different from the infected person and skew the results.
To uncover the risk of full exposure to SARS-CoV-2 outdoors, further research is needed, looking at variables such as viral load on different surfaces, how easily a virus is transmitted from an object, and the amount of virus needed to cause infection, they said.
This week, five months into COVID-19 pandemics, the total number of confirmed cases reached 5 million, according to Johns Hopkins University. A total of 333,001 people have died COVID-19, and more than 1.9 million are known to have recovered. US. is the country with the best known COVID-19 cases, such as graphs by Statista to show.
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