Too bad there is no link to the study in question ????
Coronavirus "can survive 28 days" on phones and banknotes
Researchers have found that the cooler the temperatures, the higher the survival rate of SARS-CoV-2. (we already knew ... for a long time ...)
The coronavirus has definitely not finished revealing all its secrets. According to a study by the Australian National Science Agency (CSIRO), the virus can, in a cool and dark medium, survive up to 28 days on surfaces such as phones and banknotes, according to a study by the Australian National Science Agency (CSIRO).
Researchers from the CSIRO's disease prevention department found that the higher the temperatures, the lower the survival rate of SARS-CoV-2, the agency revealed on Monday. They discovered that at 20 degrees, SARS-CoV-2 is "extremely tough" on smooth surfaces, such as phone screens. It can survive 28 days on glass, steel and polymer banknotes. At 30 degrees this survival rate drops to 7 days, and at 40 degrees it is only 24 hours..
A much longer delay
On porous surfaces like cotton, the virus survived shorter, up to 14 days at the lowest temperature and less than 16 hours at the highest. Compared to previous studies, which had shown that the coronavirus could survive for up to four days on non-porous surfaces, this time is "significantly longer", according to the Journal of Medical Virology. (WHY HOW ?)
Trevor Drew, director of the Australian Center for Disease Prevention, explained that the study involved drying samples of the virus on different materials before testing them with an "extremely delicate" method. It made it possible to find traces of living virus capable of infecting cell cultures. However, "it does not mean that this amount of virus could infect someone", he said on the public channel ABC
Humidity harms the virus
However, if a person "careless with these materials touched them, then licked your hands or touched your eyes or nose, you could get infected more than two weeks after they were contaminated". Trevor Drew expressed reservations in particular because this study was conducted with fixed levels of virus, probably corresponding to the peak of an infection, and in lack of exposure to ultraviolet light that can quickly damage the virus.
The humidity was kept at 50%, according to the study, because increased humidity is also bad for the virus. According to CSIRO, the virus is thought to spread mainly in the air, but more research is needed to better understand how it is transmitted by surfaces. Trevor Drew recalled that the main message is that "infected people are much more contagious than surfaces"This may nevertheless help explain why, even when there are no more contagious people, (the epidemic) sometimes returns even if the country is considered virus-free," he said. highlighted.
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