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Clinical Question
How effective are the different types of face masks for preventing the spread of COVID-19?
Bottom line
Based on laser testing, N95 masks transmitted less than 0.1% of respiratory droplets of COVID-19. 2c
Reference
Study design: Other
Funding: Unknown/not stated
Setting: Other
Synopsis
Research Brief #57: Although face masks have become a foundation of public health measures to mitigate the spread of respiratory illnesses such as COVID-19, they have also become lightning rods for various political agendas. Some people have used "face coverings" (eg, bandanas, gaiters, etc.) as a more comfortable or fashionable alternative to face masks. Analogous to other studies we have reported on the spread of respiratory droplets, this study used laser technology to evaluate the effectiveness of 14 different face coverings. The researchers included commercial and homemade masks, various materials, various numbers of layers, bandanas, gaiters, and a simple swath of mask material. They also included an unmasked control individual. One operator wearing each type of facial garb spoke into the darkened laser chamber and the flow of respiratory droplets were recorded and analyzed. An additional 4 operators wore a selection of the face coverings. The authors are proud to point out that their main equipment cost about $200; owning a cellphone camera means you can cheaply replicate their work! The clear winner was the commercially made, fitted N95 masks that transmitted less than 0.1% of the droplets compared with no mask. The clear loser was the gaiter-type neck fleece that actually transmitted more droplets than no mask (110%)! Bandanas were only slightly better than nothing. Although the study does not assess real-world performance, we have other empiric data that show various degrees of protection from commercial and homemade masks.
Reviewer
Henry C. Barry, MD, MS
Professor
Michigan State University
East Lansing, MI
Comments
types of masks
What about the intermediate type masks. Not many of us wear N95 except in difficult situations.
If you look at the study …
If you look at the study (the link is right there), you can see the types of mask they used. #1 appears to be a commercial ear-loop procedure mask similar to what most healthcare workers are being provided with, if that's what you specifically mean by "intermediate type."
No
Hope a vaccine works
Important
It should be broth to the attention of various POLITICIANS.
Good information to know
Needs more information about which material or fabric works better for protection against transmission of Viruses through droplets other than N95 mask ? patients how make their own mask always ask me this question
good information
Good to think about this issue