The benefit of using a double mask to block the spread of a virus was small compared to a mask correctly applied to the face, according to the simulations performed to the Japanese Fugaku supercomputer.
New data is coming in part contrary to recent recommendations from the US Centers for Disease Control (CDC), according to which the two masks are better to reduce a person ‘s exposure to coronavirus, observes in a Reuters article.
The researchers used the Fugaku supercomputer to model the flow of virus particles from people wearing different types and combinations of masks, according to a study published Thursday by the RIKEN Computer Science Center and Kobe University.
The use of a surgical mask, made of non-woven material, was 85% effective in blocking particles, when worn tightly around the nose and mouth. Adding another mask from increased efficiency to 89%.
The use of two non-woven masks is not useful, because the air is concentrated due to the resistance and causes leaks from the edges. “The performance of the double mask just does not increase”, wrote the researchers led by Makoto Tsubokura.
In general, N95 masks were the best for protection against infection, followed by non-woven masks and fabric masks, according to the study.
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