Home Article Covid-19 can survive for up to 28 days on some surfaces

Covid-19 can survive for up to 28 days on some surfaces

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Australian scientists recently found that SARS-CoV-2 can survive for up to 28 days on surfaces such as banknotes, smartphones and stainless steel. Explanations.







“SARS-Cov-2 can remain infectious on surfaces for long periods”

As part of work evaluating the survivability of the coronavirus, presented in the Virology Journal, a team of researchers fromAustralian National Science Agency (ACDP) carried out various experiments which revealed that the SARS-CoV-2 was more likely to persist at room temperature, and also survived longer on smooth, non-porous surfaces like glass or stainless steel, compared to porous substrates like cotton.

The study’s authors explained that it built on previous agency research on the Covid-19, including tests of vaccines, various protective equipment with a view to their approval as well as analyzes of wastewater.

Establishing how long the virus actually survives on surfaces allows us to more effectively predict and limit its spread, and better protect people. », Estimated Larry marshall, who supervised the work. ” 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 of potentially contaminated surfaces. », For his part stressed Debbie eagles, co-author of the study.

At 20 ° C, or roughly room temperature, we found the virus to be extremely hardy, surviving for 28 days on smooth surfaces like the glass of smartphone screens and laminated banknotes. “, has followed Eagles. ” For comparison, similar experiments performed for influenza A showed that the virus could survive on surfaces for 17 days, showing how resistant SARS-CoV-2 is.. “

Infographic showing that SARS-CoV-2 can survive from 16 hours on cotton at 40 ° C to 28 days on paper, glass, banknotes or vinyl at 20 ° C. The document specifies that the tests were carried out in the absence of exposure to ultraviolet light which can quickly alter the virus, and with a humidity level maintained at 50%, since an increase in it is revealed. also harmful to the virus. – © CSIRO

A variable duration

To reach these conclusions, the researchers allowed artificial mucus containing the virus (with concentrations used similar to those reported in samples from infected patients) to dry on different types of surfaces. Experiments carried out at 30 and 40 ° C have shown that the SARS-COV-2 became less persistent as the temperature increased.

While the precise role of surface transmission, the degree of contact with them, and the amount of virus needed to generate infection remain to be determined, it is critical to establish how long this virus remains viable on surfaces. surfaces to develop risk mitigation strategies in areas of high contact », Estimated Eagles.

The length of time they can survive and remain infectious depends on the type of virus, the amount, surface area, environmental conditions and how it is deposited – for example, contact versus droplets emitted by coughing “, highlighted Trevor Drew, director ofACDP. ” Knowing that proteins and fats in body fluids can also significantly increase the survival time of viruses. “

The study authors said that such work also helps explain the persistence and spread of SARS-CoV-2 in cold environments with a high concentration of lipids or proteins, such as facilities dedicated to meat processing, and provided avenues for better coping with this risk.

– Iakov Filimonov / Shutterstock.com






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