Sunlight inactivates SARS-CoV-2 on the surface in laboratory studies because CDC says the virus does not spread easily through the medium

The sunlight seems to be inactivated Coronavirus The cause COVID-19, according to the survey.

Scientists say “immediate inactivation” of simulated sunlightCoVLab Stainless Steel Coupons-2. The survey results are Infectious Disease Journal..

Previous studies have shown that SARS-CoVThe authors described in the paper that -2 can survive for many days on non-porous indoor surfaces under appropriate conditions. One widely referenced study published in New England Medical Journal Bacteria can survive up to 3 days in plastics and steel, while cardboard can survive for 24 hours, copper for 4 hours, and aerosols for up to 3 hours.

However, the latest guidance released earlier this month, published last month, states that the Centers for Disease Control and Prevention is not expected to spread viruses easily by touching surfaces or objects.

SARS-CoVBecause the -2 can survive in outdoor-like conditions, the team used a device that simulates natural sunlight, including UV light. They also controlled laboratory temperature and humidity. The virus propagated both in laboratory culture and in liquids resembling human saliva. The sample was then dried with a stainless steel coupon.

Contaminated coupons were attached to mounting strips, mounted on the walls of the chamber and exposed to light for various times of 2-18 minutes. Another set of coupons containing the virus was placed in the chamber for up to 60 minutes in the dark as a control.

UV B (UVB) Rays were soon found to inactivate SARS-CoV-2, according to the team. 90% of the virus was inactivated every 6.8 minutes in saliva under the longest daytime sunlight-like condition at 40 degrees north latitude.

Nikko, which represents the winter solstice at the same latitude, inactivated the virus every 14.3 minutes in saliva. SARS-CoV-2 was twice as inactivated in saliva as in culture for reasons that were not immediately apparent. On the other hand, the coupon virus kept in the dark remained almost unchanged.

The results of the study indicate that outdoor conditions exposed to direct sunlight may “significantly reduce” the ability of the virus to spread compared to indoor conditions. “Further, these data provide evidence that natural sunlight may be effective as a fungicide for contaminated non-porous materials,” they said.

However, the team emphasized that the results may differ in real-world scenarios. They said: “A significant level of viral inactivation was observed within minutes at all simulated sun light levels investigated, but the duration of that day outdoors was UVB Levels above those used in current research depend not only on time of year, but also on local weather conditions, especially cloud cover.

“Therefore, there can be significant daily fluctuations in the sustainability of SARS.CoV-2 on the surface of the outdoor environment. “

The team pointed out that one size of virus droplet could be used and future studies could investigate how this might affect deactivation. And although they have done their best to simulate saliva, they can distort the results, unlike saliva in infected people.

To reveal the full risk of exposure to SARS-CoV-2 outdoors, the load of the virus on various surfaces, how easily the virus passes from the object, and how it is needed to cause infection Further investigation is needed by examining variables such as virus load. They said.

5 months later this week COVID-19 pandemics, total number of confirmed cases hit 5 million, According to Johns Hopkins University.. A total of 333,001 people died COVID-19, and more than 1.9 million people are known to have recovered. America is the most known country COVID-19 cases, by graph Statista is showing.