Health
Cloth masks may reduce infection with COVID-19
Evidence shows that cloth masks, especially those with multiple layers of cotton cloth, block environmental droplets and aerosol contamination that can reduce COVID-19 transmission.
“The point is not that some particles can penetrate the mask, but some particles stop from the wearer, especially towards the outside.”
“Ideally, we want the mask to function in both directions to protect the wearer from the environment and reduce the wearer’s environmental pollution (air and surface).”
Her international research team examined the first-century evidence, including recent data, and found strong evidence that cloth and cloth masks can reduce air and surface pollution.
“There is lack of direct evidence that wearing some kind of mask outside the medical facility reduces the actual infection with COVID-19.
That’s why it’s difficult to make public health decisions about wearing masks and why they’re different around the world, “Clase said. Health policy on the issue. “
The opinion of the team is Internal medicine annual report May 22nd.
Whether cloth masks protect others from the wearer was studied in the 1960s and 1970s. A mask made of three layers (muslin flannel muslin) reduced surface contamination by 99%, suspended microorganisms by 99%, and bacteria by 88% to 99% from smaller particle aerosols.
A commercial mask made with 4 layers of cotton muslin has been shown to reduce all particles by 99%. This is 96% to 99% of modern disposable medical masks. Despite aerosols, fabric masks are comparable to medical masks of the time, researchers say.
The filtration of cloth is very variable, with monolayers of scarves, sweatshirts and t-shirts ranging from 10-40%. However, multiple layers improve efficiency, and modern research has confirmed that some fabric combinations, such as cotton flannel, block more than 90% of the particles.
Our work is just part of a complex puzzle. When it comes to creating a mask, it’s important to recognize that more layers provide more protection both inside and outside, but make breathing difficult. For this reason, we do not recommend wearing a mask for children under the age of 2 or for people with dyspnea. “
Catherine Class, First Author of Research, Associate Professor, McMaster University School of Medicine
She also added that more research is needed on the best materials and designs for cloth masks to help many who are sewing masks to protect people in the community.
“Given the severity of this pandemic and the difficulty of controlling it, we suggest that the potential benefits of a modest reduction in infection are likely to outweigh the potential harm,” Klass said.
Source:
See journal:
Clase, C.M. , other.. (2020) Fabric respirators can impede transmission of COVID-19: an evidence-based, risk-based approach. ACP Journal.. doi.org/10.7326/M20-2567..
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