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U.S. government researchers have determined that the virus survives best indoors and in dry conditions, and loses potency when temperatures and humidity rise – and especially when it is exposed to sunlight, said William Bryan, acting head of the U.S. Department of Homeland Security's Science and Technology Directorate.
"The virus dies quickest in the presence of direct sunlight," he told a White House news briefing. On non-porous surfaces like stainless steel, the new coronavirus takes 18 hours to lose half its strength in a dark, low-humidity environment, Bryan said.
In a high-humidity environment, that half-life dropped to six hours, and when the virus was exposed to high humidity and sunlight, the half-life dropped to two minutes, he said.
Researchers found a similar effect with the coronavirus that was suspended in the air, simulating the coughing or sneezing that often spreads the disease. In a dark room, the virus maintained half its strength for an hour. But when exposed to sunlight, it lost half its strength in 90 seconds, Bryan said.
Researchers also found that isopropyl alcohol was a more effective disinfectant than bleach, he said.
The findings could bolster hopes that the coronavirus will mimic the behaviour of other respiratory diseases like influenza, which typically are less contagious in warm weather.
https://www.cbc.ca/news/world/trump-disinfectant-light-reaction-1.5543563
"The virus dies quickest in the presence of direct sunlight," he told a White House news briefing. On non-porous surfaces like stainless steel, the new coronavirus takes 18 hours to lose half its strength in a dark, low-humidity environment, Bryan said.
In a high-humidity environment, that half-life dropped to six hours, and when the virus was exposed to high humidity and sunlight, the half-life dropped to two minutes, he said.
Researchers found a similar effect with the coronavirus that was suspended in the air, simulating the coughing or sneezing that often spreads the disease. In a dark room, the virus maintained half its strength for an hour. But when exposed to sunlight, it lost half its strength in 90 seconds, Bryan said.
Researchers also found that isopropyl alcohol was a more effective disinfectant than bleach, he said.
The findings could bolster hopes that the coronavirus will mimic the behaviour of other respiratory diseases like influenza, which typically are less contagious in warm weather.
https://www.cbc.ca/news/world/trump-disinfectant-light-reaction-1.5543563