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US research: Covid-19 killed by sunlight, warmer temperatures, humidity
Sunlight kills COVID-19 while warmer temperatures and humid weather significantly damage the virus, measured in terms of the virus' half life or the time it takes to cut its potency in half, according to the latest breakthrough research from the US Department of Homeland Security's most advanced bio containment lab, released at the White House here on Thursday. The coronavirus outbreak in the US has killed nearly 50,000 Americans and infected more than 860,000 till date. Research around the effect of temperature and humidity has been gaining traction for weeks, these are the most downloaded papers on research websites but this is the first time the US government has put an official stamp on initial results of temperature tests on COVID-19.
"Our most striking observation to date is the powerful effect that solar light appears to have on killing the virus, both on surfaces and in the air. We've seen a similar effect with both temperature and humidity as well. Increasing the temperature and humidity or both is generally less favourable to the virus," Bill Bryan, chief of the science and technology directorate at the US Department of Homeland Security, said.
In a room at 70-75F temperature with 20 per cent humidity, the half life of the virus is about an hour, according to Bryan. "But you get outside and it cuts down to a minute and a half, very significant difference when it when it gets hit with UV rays," he said. According to the same research, the virus' half life on surfaces reduces dramatically with a combination increase of temperature and humidity.
When the temperate is kept constant at 70-75F and only the humidity is cranked up from 20 per cent to 80 per cent, the virus' half life is shown to crash from 18 hours to 6 hours. If the temperature is increased to 95F, the half life sinks to barely 60 minutes. Bryan said this testing was done at DHS' advanced bio containment lab in Maryland, just outside the national capital.
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