Coronavirus can survive 28 days on common surfaces: research

Researchers at CSIRO, Australia’s national science agency, have found that the coronavirus can survive for up to 28 days on common surfaces, including banknotes, glass — such as that found on mobile phone screens — and stainless steel, reports SciTechDaily.

News Deskbdnews24.com
Published : 12 Oct 2020, 03:20 AM
Updated : 12 Oct 2020, 03:20 AM

The research, undertaken at the Australian Centre for Disease Preparedness in Geelong, found that SARS-CoV-2, the virus responsible for COVID-19, survived longer at lower temperatures and tended to survive longer on non-porous or smooth surfaces such as glass, stainless steel and vinyl, compared to porous complex surfaces such as cotton. It survived longer on paper banknotes than plastic banknotes.

Results from the study that measured the effect of temperature on the persistence of SARS-CoV-2 on common surfaces was published in Virology Journal.

Surface survivability research builds on the national science agency’s other COVID-19 work, including vaccine testing, wastewater testing, Personal Protective Equipment manufacture and accreditation, and big data dashboards supporting each state, said CSIRO Chief Executive Dr Larry Marshall.

“Establishing how long the virus really remains viable on surfaces enables us to more accurately predict and mitigate its spread, and do a better job of protecting our people,” Dr Marshall 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 handwashing and cleaning surfaces,” said Dr Debbie Eagles, deputy director of ACDP.

“At 20 degrees Celsius, which is about room temperature, we found that the virus was extremely robust, surviving for 28 days on smooth surfaces such as glass found on mobile phone screens and plastic banknotes.”

“For context, similar experiments for Influenza A have found that it survived on surfaces for 17 days, which highlights just how resilient SARS-CoV-2 is.”

The research involved drying virus 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.

Further experiments were carried out at 30 and 40 degrees Celsius, with survival times decreasing as the temperature increased.

The study was also carried out in the dark, to remove the effect of UV light as research has demonstrated direct sunlight can rapidly inactivate the virus.

“While the precise role of surface transmission, the degree of surface contact and the amount of virus required for infection is yet to be determined, establishing how long this virus remains viable on surfaces is critical for developing risk mitigation strategies in high contact areas,” Dr Eagles said.

Director of ACDP Professor Trevor Drew said many viruses remained viable on surfaces outside their host.

“How long they can survive and remain infectious depends on the type of virus, quantity, the surface, environmental conditions and how it’s deposited — for example touch vs droplets emitted by coughing,” Professor Drew said.

“Proteins and fats in body fluids can also significantly increase virus survival times.

“The research may also help to explain the apparent persistence and spread of SARS-CoV-2 in cool environments with high lipid or protein contamination, such as meat processing facilities and how we might better address that risk.”

CSIRO, in partnership with the Australian Department of Defence, undertook the studies in collaboration with the 5 Nation Research and Development (5RD) Council, which comprises representatives from the UK, USA, Canada, New Zealand and Australia.

Each country is conducting research on different aspects of virus survivability with the results shared as they become available.