Health
Surgical mask or cotton face cover?Scientists reveal the best way to stay safe from Covid-19
Face masks have been a part of everyday life since the outbreak of the pandemic, but care must be taken to effectively limit the spread of covid-19. A research team in the United States investigated the filtration efficiency of various types of masks worn by the general public and professionals. They found that, when properly worn, certain nylon masks can be up to 79% effective in blocking particles that can carry the virus.
In collaboration with the U.S. Environmental Protection Agency, scientists at the North Carolina Medical College have studied the levels of protection provided by several types of face masks, from medical masks to consumer masks to instant face masks. .. They evaluated the protection that each mask provides to the wearer when exposed to others who may be infected. To achieve this, they used a method based on the Occupational Safety and Health Administration (OSHA) conformance test to determine the conformity filtration efficiency of the mask. A total of 12 facial protections were tested, worn by an adult man with repeated torso, head, and facial muscle movements.
This study, published in the journal JAMA Internal Medicine, reveals that improvisational masks can prove to be effective as long as they are properly worn and worn. In addition, researchers explain that an unmodified medical procedure mask with an ear loop (commonly known as a surgical mask) provides a filtration efficiency of 38.5%. However, this can be improved to 60.3% by tying the ear loops in a particular way to improve the fit and to 80% by adding a layer of nylon.
As for consumer masks, “2-layer non-woven mask with ear loops and nose bridge, washed, and no insert” was ranked high (79%), followed by “2-layer non-woven nylon”. With mask, ear loops and nose bridge, and one non-woven insert “(74.4%). The “Bandit” style folded in a cotton bandana proved 49% effective, while the 3-layer cotton woven mask with ear loops was the least effective option (26.5%).
For medical masks, the 3M 9210 NIOSH approved N95 respiratory mask was the most effective (98%), while the tie surgical mask was 71.4% effective. Surgical masks with ear loops were 38.5% effective (60.3%) unless the loops were tied and the corners were pushed in.
“Changing the surgical mask improves the fit of the mask, which improves filtration capacity and reduces the inhalation of suspended particles, but is the fit filtration efficiency of many consumer masks about the same as the surgical mask? I showed that it was more than that. ” Co-lead authors Phillip Clapp, PhD, are inhalation toxicologists and assistant professors of pediatrics at UNC School of Medicine.
In addition to informing consumers about the effectiveness of the various types of face masks offered and the best way to wear them, the findings show that the “ultimate” face masks help stop the spread of the virus. It can also be useful in design.
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