Studies show that shields worn alone do not work against Covid-19

Studies show that shields worn alone do not work against Covid-19

TOKYO: Facial shields alone aren’t as effective at preventing Covid 19 infections without a mask, according to a new study on how air flows around plastic screens when someone nearby sneezes. happens.
The study, published in the journal Physics of Floods, found that the number of people using face shields as an alternative to face masks is increasing in schools, universities, restaurants and service businesses.
However, scientists, including those from Fukuoka University in Japan, said that sneezing indicates a phenomenon known as straw dyes that can catch microscopic particles and block shields. Can pass
Explaining the study, Foucault University co-author Fueyo Akagi said, “A whirlpool is a donut-shaped straw that is formed by the immediate discharge of fluid from a circular substance. Similar to the thumb. ”
In the study, scientists estimated what happens when a person wearing a face shield is discovered to be sneezing by an infected person standing one meter in front of them.
“The straw bells from the sneeze capture the microscopic droplets inside the sneeze and carry it to the top and bottom edges of the face shield,” Akagi said.
He added that the drops travel faster on the wearer of the face – within 0.5 to 1 second after the onset of sneezing.
“If the time of arrival is in harmony with the breath, the shield wearer will suffocate the drops,” he added.
Based on this analysis, the scientists said that sneeze droplets are not only transmitted by high-velocity air flow caused by sneezing, but also by the whirlpool rings caused by sneezing.
He said that the microscopic droplets displaced by the whirlpool’s thumbs could enter the shield from the top and bottom edges.
The scientists also wrote in the study, “It was also confirmed that some particles – in this simulated form, 4.4% of the released droplets – entered the facial shield and reached around the nose.”
Researchers believe that facial shields alone are not the most effective way to prevent Covid-19 infections.
However, with a better understanding of the facial shield vulnerabilities, they hope to increase protection by reducing the flow inside the shield.
“We are currently developing and demonstrating several improved shields,” Akagi said.
“We want to play our part in keeping people safe from infection, and we believe that one day in the near future, medical workers will be able to avoid infection using only facial shields and regular masks or ideally only facial shields Will, “he added.

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