Coronavirus May Live for Weeks on Money and Devices

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    How long does coronavirus live on surfaces like money and mobile phones? The new coronavirus may remain infectious for weeks on banknotes, glass and other common surfaces, according to research by Australia’s top biosecurity laboratory that highlights risks from paper currency, touchscreen devices and grab handles and rails. Scientists at the Australian Centre for Disease Preparedness showed SARS-CoV-2 is “extremely robust,” surviving for 28 days on smooth surfaces such as glass found on mobile phone screens and plastic banknotes at room temperature, or 20 degrees Celsius (68 degrees Fahrenheit). That compares with 17 days survival for the flu virus. Virus survival declined to less than a day at 40 degrees Celsius on some surfaces, according to the study, published in Virology Journal. The findings add to evidence that the Covid-19-causing coronavirus survives for longer in cooler weather, making it potentially harder to control in winter than summer. The research also helps to more accurately predict and mitigate the pandemic’s spread, the scientists said. “Our results show that SARS-CoV-2 can remain infectious on surfaces for long periods of time, reinforcing the need for good practices such as regular hand washing and cleaning surfaces,” said co-author Debbie Eagles, the center’s deputy director, in an emailed statement Monday. The coronavirus is transmitted mostly through direct contact with an infected person, especially the virus-laden particles they emit while coughing, sneezing, speaking, singing and even breathing. SARS-CoV-2 may also contaminate surfaces when these particles settle, creating so-called fomites that the researchers said may play a lesser, though important role in transmission of the virus. “It does raise some critical issues around the need to keep on disinfecting surfaces, even when community cases are low,” said Trevor Drew, the center’s director and another co-author, in an interview. “We still need to carry out those disinfection regimes, both personally and at a public level, even when there don’t seem to be any cases around because there may well be some residual virus that you’ve missed.” SARS-CoV-2 spread via fomites is plausible, researchers at Kansas State University said in a study released ahead of publication and peer review in August. They analyzed the coronavirus’s stability on a dozen surfaces and found it survived five-to-seven times longer under cooler, less-humid spring/fall conditions compared with the average temperature and humidity in summer. Scientists at the Australian government laboratory have determined virus survival previously for hundreds of different viruses. They found in the case of SARS-CoV-2 that it survives longer on nonporous or smooth surfaces, compared with porous complex surfaces, such as cotton. The research received funding from Australia’s defense department. It involved drying the coronavirus in an artificial mucus on different surfaces, at concentrations similar to those reported in samples from infected patients, and then re-isolating the virus over a month. The study was also carried out in the dark, to remove the effect of ultraviolet light, as research has demonstrated direct sunlight can rapidly inactivate the virus. The persistence on glass is an important finding, given that touchscreen devices such as mobile phones, bank ATMs, supermarket self-serve checkouts and airport check-in kiosks are high touch surfaces which may not be regularly cleaned and therefore pose a transmission risk of SARS-CoV-2, the researchers said in the paper. They found the longer survival time of SARS-CoV-2 than seasonal flu on banknotes “of particular significance, considering the frequency of circulation and the potential for transfer of viable virus both between individuals and geographic locations.” The survival of the coronavirus on stainless steel at cooler temperatures may help explain Covid-19 outbreaks linked to meat processing and cold storage facilities, the authors said. Their data support the findings of a study showing the survival of SARS-CoV-2 on fresh and frozen food as well, they said. “It’s going to survive for much longer in cooler conditions, and that’s irrespective of whether it’s on a surface or whether it’s in the air,” Drew said. “This may help to explain why the sort of environments, such as slaughterhouses, would be potentially a more hazardous area.”

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    In This Story: COVID-19

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    • a high temperature (e.g. head feels warm to the touch)
    • shortness of breath (if this is abnormal for the individual, or increased)

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