Coronavirus on surfaces “up to 2 minutes”: the new study


    <h2>The time ranges from 3 seconds to 2 minutes and depends not only on the type of surface but also on the level of humidity</h2>


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    <p>Coronavirus travels in saliva droplets and <strong>it resists on surfaces from 3 seconds up to 2 minutes</strong>. These results came from research published in the journal "Physics of Fluids" and conducted in six cities in America, Asia and Australia, coordinated by Rajneesh Bhardwaj and Amit Agrawal, of the Ndian Institute of Technology in Bombay.

From the glasses of glass to handles of the doors, up to the steel pots and the display of smartphones, the Sars-CoV-2 would not exceed 2 minutes of stay on the surfaces.

This is data in stark contrast to other studies that indicate virus survival up to 17 days on certain types of materials.

These results, explained Bhardwaj, would be able to “explain the slow or rapid spread of the infection in a particular city and “it may not be the only factor, but it definitely counts in the growth rate of the infection.”

Coronavirus on surfaces: depends on the resistance of the droplets

According to what the researchers wrote, it all depends on droplets that carry the virus: once these have evaporated, “the residual virus dies quickly” and its survival is directly influenced by the time in which they remain intact.

Therefore, the evaporation time of the saliva droplets plays an important role and – by comparing the surfaces of New York, Chicago, Los Angeles, Miami, Sydney and Singapore – significant differences have emerged.

A higher ambient temperature, in fact, makes the droplets dry more quickly, drastically reducing the chances of survival of the virus.

Coronavirus, how much it resists on surfaces: the role of humidity

On the contrary, in places with a higher humidity, the droplets stay longer on the surfaces and, according to the researchers, the chances of survival of the virus increase.

To give an example, the research examined the drying time of a droplet in an indoor air-conditioned environment, at 25 degrees, against an external a 40 degrees.

If at 25 degrees the evaporation time for small droplets is 6 seconds and increases to 27 seconds for large droplets, at 40 degrees the evaporation time is reduced by 50%.

Finally, with humidity, the evaporation time of a droplet increases by almost 7 times and becomes greater than 2 minutes for larger droplets.

In conclusion, according to the authors of the research, this could prove to be a serious problem with the increase in humidity in the coastal areas in summer and in the places of Asia affected by the monsoons between July and September.

VIRGILIO NEWS | 09-06-2020 17:29

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