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Researchers from Australia’s National Science Agency found that coronavirus can survive on surfaces such as phone screens for up to 28 days in cold, dark conditions – AFP / Archives
The coronavirus that causes covid-19 can survive on surfaces such as banknotes or mobile phones for up to 28 days in low temperatures and in the dark, according to a study by Australia’s National Science Agency.
Researchers from the CSIRO disease prevention center tested the longevity of SARS-CoV-2 in the dark under three types of temperature.
Survival rates drop when temperatures are hotter, the agency announced Monday.
Scientists have discovered that at a temperature of 20ºC, SARS-CoV-2 is “extremely resistant” on smooth surfaces such as mobile phone screens, surviving up to 28 days on glass, steel or plasticized money.
At 30 ° C, survival decreases for 7 days and for 24 hours at temperatures of 40 ° C.
The virus survived shorter periods on porous surfaces like cotton, “up to 14 days at low temperatures and less than 16 hours at high temperatures,” according to the researchers.
This is “significantly longer” than the results of previous studies, which found that the virus can survive up to four days on smooth surfaces, according to the report published in the specialized journal Virology Journal.
Trevor Drew, director of CSIRO, said the study was conducted with samples of the virus in different materials before subjecting them to an “ultrasensitive” method that found traces of live viruses capable of infecting cells in culture.
“This does not mean that the amount of virus can infect someone,” he said on public television ABC.
If a person “is not careful with these materials and touches them and then puts their hand in their mouth or touches their eyes or nose, they can become infected up to two weeks after (these objects) have been contaminated,” he warned.
Drew said, however, that there are some reservations. Among them, that the study was carried out with fixed levels of virus that could represent the peak of a typical infection, and there was no exposure to ultraviolet light, which can rapidly destroy the virus.
The humidity was kept constant at 50%, although the increase in humidity also harms the virus, according to a study.
According to CSIRO, the virus spreads primarily through the air, but more research is needed to establish transmission of the virus through surfaces.
“To develop risk mitigation strategies in high contact areas, it is essential to determine the precise role of surface transmission, the degree of surface contact and the amount of virus it takes to become infected and how long (the virus) remains viable” Said Debbie Eagles from CSIRO.
But the main message is that “people are much more infectious than surfaces,” Drew told ABC.
“However, it may help explain why, even when people are not infected, new outbreaks sometimes appear, even in countries considered free” of the virus, he said.
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