At 21-24 degrees Celsius and high humidity the “half-life” of the SARS-CoV-2 particle on the surface is 2 minutes in direct sunlight and 6 hours – in its absence, the NBACC experts say.
Direct sunlight has a strong effect on the coronavirus SARS-CoV-2 and contributes to its death. The statement was made by U.S. Department of Homeland Security Advisor on Science and Technology William Bryan at a briefing Thursday, April 23. For example, at 21-24 degrees Celsius and 80 percent humidity, the “half-life” of a viral particle in a drop of human saliva on the surface is 2 minutes, and for the same particle in the air and 20 percent humidity it is about 1.5 minutes, he said.
Brian cited a study by the National Center for Biological Defense Analysis and Countermeasures (NBACC). According to scientists, at the same temperature and in the absence of sunlight the “half-life” of the particle on the surface is 6 hours at 80 percent humidity and 18 hours at 20 percent humidity, and in the air (at 20 percent humidity) is about 60 minutes.
The results of the study have not yet been published. NBACC experts emphasize that there are still unknown links in the COVID-19 transmission chain.
Coronavirus SARS-CoV-2 has been detected in over 2.7 million people in 210 countries and territories since it was detected in China in late 2019. Over 190,000 people have died of the effects of the disease. In absolute terms, the United States has the highest number of infections and fatalities.