‘Better’ face masks can mitigate the spread of Covid-19 indoors: study | World news

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A study at the Canadian University of Waterloo concluded that the widespread use of ‘better’ face masks is necessary to mitigate the spread of coronavirus disease (Covid-19) in confined spaces, according to the news agency ANI.

For the exercise, the engineering researchers used a dummy that simulated a person sitting breathing in a large room. The team observed a significant build-up of aerosols, over time, despite the use of tissue surgical masks and common bruises. According to the researchers, the exhaled droplets were so small that they can stay suspended and travel through the air.

The study ultimately showed that the most common masks only filter about 10% of exhaled aerosols, mostly due to fit and filter issues. The remaining aerosols, it was found, are redirected in an unfiltered state, mainly out of the top of the mask covering the nose, and escape into the surrounding air.

In contrast, high-quality and more expensive masks such as N95 and KN95 filter over 50% of exhaled aerosols that can build up inside and, when inhaled, lead to transmission of Covid-19, according to the study.

Speaking about the exercise, Serhiy Yarusevych, its lead investigator, said: “There is no doubt that it is beneficial to wear a face cover, both for protection near and from a distance in a room. . However, there is a reason doctors wear an N95 mask… these work much better. We have provided solid numbers and rigorous analysis to back up our hypothesis. “

Yarusevych also recommended the use of the N95 and KN95 masks in indoor environments, such as schools and workplaces, whenever possible.

Previous research has established that aerosols, when dispersed by people infected with the coronavirus, can transmit SARS-CoV-2, the virus that causes Covid-19. Transmission can take place even outside the two-meter social distancing gap widely suggested by health authorities.


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