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Researchers revealed that face masks reduce the risk of spreading large droplets that can transmit Covid 19 infection by talking or coughing by up to 99.9%, according to a new laboratory experiment conducted on mannequins and humans.
Residents of a large number of countries in the world are required to wear masks to slow the spread of the new Corona virus, and the question remains about the usefulness of face masks. So to what extent can they protect us from infection?
In this regard, the researchers revealed that masks reduce the risk of spreading large droplets that can transmit Covid 19 infection when speaking or coughing by up to 99.9%, according to a new laboratory experiment conducted on display statues and in humans.
They wrote in the journal “Royal Society Open Science” that a woman standing six feet from a man who coughs without a mask would be exposed to such drops 10,000 times more than if she were wearing a mask.
“There is no doubt that masks can significantly reduce the dispersion of potentially virus-laden droplets,” lead author Ignacio Maria Viola, an expert in applied fluid dynamics at the University of Edinburgh College of Engineering, told AFP.
Main motor
He also explained that the large respiratory droplets that come out in the form of droplets and act as projectiles before they fall to the ground by gravity, are probably the main driver of the transmission of SARS-Cove-2.
The smallest and finest droplets, which form so-called aerosols, which are suspended particles, can remain suspended in the air for longer periods and represent a danger, especially indoors in poorly ventilated places, especially if they are crowded with people who do not they wear a muzzle or put it wrongly under the nose.
“We constantly inhale a variety of droplets, from microscale to millimeter, and some droplets fall faster than others, depending on the particular temperature, humidity, and airflow rate,” said the researcher.
The study focused on particles larger than 170 microns in diameter, roughly two to four times the width of a human hair.
Aerosol particles that tend to follow air currents are described as smaller than 20 or 30 microns.
Reduce deaths
“In our study, we are talking about a 99.9% decrease in the largest falls that we measure,” said Ignacio María Viola.
The World Health Organization recently updated its guidelines for masks to recommend that they be worn indoors in the presence of other people if ventilation is insufficient.
Masks are primarily used to reduce the release of virus-laden droplets from people who cough, sneeze, sing, speak, or simply breathe, but they can also help prevent inhalation of droplets by people who place them.
Universalizing the mask will reduce the number of deaths worldwide by 400,000 by April 1, according to the Institute for Health Metrics and Evaluation in Seattle, Washington.
Sheet masks are not effective
Foil masks not only effectively prevent most large droplets that are 20-30 microns or larger, they can also prevent fine droplets and particles from being released on exhalation, often referred to as an aerosol. “
Reuters statistics showed that more than 78.59 million people were infected with the emerging coronavirus worldwide, while the total number of deaths resulting from the virus reached one million and 729,392.
HIV infections have been recorded in more than 210 countries and regions since the first cases were discovered in China in December 2019.
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