Coronavirus: The results of a study regarding the control of the mask worn by health and nursing staff
According to information from a new study, we are led to the conclusion that The use of a used mask may be less effective in protecting against coronavirus from not using it.
According to dailymail, the researchers examined three-level surgical masks, which are often used by health and nursing staff.
The conclusion they reached was that unused masks can filter almost three-quarters of the tiny particles that remain in the air and are responsible for contamination.
However, when used more than once, they filter only a quarter of the small droplets. This is because the masks are deformed with each use. The team of researchers from Lowell University of Massachusetts and the California Baptist University point out that the findings at their disposal provide information on the shape of the mask should be taken into account both when considering their protection and when designing new masks.
It is noted that Three-level masks are one of the most recommended for health and nursing staff. Their inner layer is made of absorbent material, their middle layers act as a filter and their outlet is made of non-absorbent material. For the study, published in the journal Physics of Fluids, the team developed a computer model of a person wearing a surgical mask with folds.
Then they examined behavior of aerosols, tiny droplets of liquids and airborne particles. This model tracked where aerosols landed on the mask and face, and whether they reached the nose or lungs. So it seemed that when people wear masks, the way the air flows around their face changes. At the same time, the researchers found that air does not enter through the nose and mouth at specific points, but through the entire surface of the mask at low speeds.
Immediately after they examined her filtering performance of three-level masks. During the test they found that the new masks can filter 65% of the particles. However when used they can only filter 25%. This means that a mask, when new, offers good protection, but its wear and tear can often be worse than not wearing a mask at all.
Researchers believe this is because aspects of the surgical mask affect airflow patterns, and when used over and over again, they change shape and thus reduce their effectiveness. It is noted that this research team hopes through a future research to study how different mask shapes affect our protection.
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