How Long the COVID-19 Virus Lasts on Surfaces: New Research on SARS-CoV-2 “Survivability”

How Long Does SARS-CoV-2 Last

How long does SARS-CoV-2 last on different surfaces? Credit: CSIRO

Researchers at CSIRO, Australia’s national science agency, have found that SARS-CoV-2, the virus responsible for COVID-19, can survive for up to 28 days on common surfaces including banknotes, glass — such as that found on mobile phone screens — and stainless steel.

Testing Survivability of SARS-CoV-2

Droplets of SARS-CoV-2 virus in artificial mucous were applied to test surfaces at CSIRO’s Australian Centre for Disease Preparedness (ACDP) at Geelong. Pictured is a droplet on an Australian five dollar note. Credit: CSIRO

The research, undertaken at the Australian Centre for Disease Preparedness (ACDP) in Geelong, found that SARS-CoV-2:

  • survived longer at lower temperatures 
  • 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 
  • survived longer on paper banknotes than plastic banknotes.

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

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

“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.

“Together, we hope this suite of solutions from science will break down the barriers between us, and shift focus to dealing with specific virus hotspots so we can get the economy back on track.

“We can only defeat this virus as Team Australia with the best Australian science, working alongside industry, government, research and the Australian community.”

Dr. Debbie Eagles is Deputy Director of ACDP, which has been working on both understanding the virus and testing a potential vaccine.

“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,” Dr. Eagles said.

“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.”

Reference: “The effect of temperature on persistence of SARS-CoV-2 on common surfaces” by Shane Riddell, Sarah Goldie, Andrew Hill, Debbie Eagles and Trevor W. Drew, 7 October 2020, Virology Journal.
DOI: 10.1186/s12985-020-01418-7

CSIRO, in partnership with 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.

3 Comments on "How Long the COVID-19 Virus Lasts on Surfaces: New Research on SARS-CoV-2 “Survivability”"

  1. 28 days can be alot! Should we sanitize every note that we get from market?

  2. Frogs can’t swallow without blinking their eyes. I’m sorry, I thought we were offering up useless facts. The fact that this research was conducted in a dark room makes this information useless for real world applications. All light bulbs emit some level of UV, and while that might not be harmful to humans, it could certainly effect the life span of the virus. Bow, if they did side-by-side experiments with a dark room, and a lighted room, that might be useful.

  3. Regarding the usefulness of the test being done in darkness: this is useful for things like money tucked away in a wallet. Or for items sent in a package… Being isolated from outside exposure for 3-5 days during shipping isn’t enough, apparently.

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