Health
Mask blocks 99.9% of large Covid-linked droplets: research, European news and top stories
Paris (AFP)-Face Mask Reduces the risk of spreading droplets linked to large Covids Researchers said Wednesday (23 December) that talking and coughing up to 99.9%, according to laboratory experiments with mechanical mannequins and humans.
A woman standing 2 meters from a man coughing without a mask is exposed to 10,000 times more water droplets than a man coughing, even if only 50 cm away, according to Royal Society Open Science. It has been reported to.
Ignazio Maria Viola, a senior author and expert in applied fluid dynamics at the University of Edinburgh’s Faculty of Engineering, told AFP:
He said that large respiratory droplets, which act like projectiles before being pulled toward the ground by gravity, are the main driving force for the Sars-CoV-2 infection.
Small things, sometimes called aerosol droplets, can remain suspended in the air for extended periods of time.
“We continuously spit out a range of droplets, from microscale to millimeter scale,” Dr. Maria Viola said on the phone.
“Some droplets fall faster than others,” he said, depending on temperature, humidity, and especially airspeed.
This study focused on particles larger than 170 microns in diameter (about 2-4 times the width of human hair).
Aerosol particles, which tend to follow the flow in the air, are generally described as being smaller than 20 or 30 microns.
Studies have found that medium-sized droplets can behave in either direction.
“Wearing a mask can reduce virus infections by orders of magnitude, which is a tenth,” said Dr. Maria Viola.
“Our study says that for larger droplets we measure, it’s about 99.9 percent less.”
According to the Institute for Health Metrics (IHME) in Seattle, Washington, the adoption of the Universal Mask policy could save 55,000 lives in the United States in the next four months.
The Institute’s modeler, who accurately predicted that Covid-19 deaths in the United States would exceed 224,000 by November 1, in mid-July, reported 561,000 deaths by April 1, 2021. Is predicting.
They calculate that universal mask wear will reduce the world’s death toll from 2.9 million to 2.5 million by 400,000 over the same period. To date, the virus has killed about 1.7 million people.
Earlier this month, the World Health Organization updated its Covid-19 guidance on masks as follows: Recommended to wear indoors in front of others Insufficient ventilation.
The guidelines apply specifically to areas of known or suspicious community infections.
Masks primarily help people reduce the release of viral droplets when coughing, sneezing, singing, talking, or simply breathing, but inhalation of droplets by the person wearing the mask It also helps prevent it.
According to the CDC, “cloth masks can not only effectively block most large droplets, 20-30 microns and above, but also the exhalation of fine droplets and particles, also known as aerosols. “.
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